van gorkom yacht design

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Van Gorkom Yacht Design

Yacht Features

Propulsion System

Van Gorkom Yacht Design

Professional BoatBuilder Magazine

An aluminum expedition catamaran.

By Dieter Loibner , Apr 5, 2022

With 110′ LOA, a 35′ beam, and 45′ (33.5m, 10.6m, and 13.7m) of bridge clearance, the H-2 catamaran seeks to make a case for U.S. custom boatbuilding.

Hauling toys beyond the horizon is the raison d’être for a rugged go-anywhere catamaran designed and built in the U.S., a notable exception in the world of big yacht projects.

Gunboat might have left town, but there’s another big catamaran under construction in its old facility in Wanchese, North Carolina. It’s called H-2 , short for Hippocampus 2 , a stout 110-footer (33.5m) that liberally and intentionally quotes from the expedition/workboat vernacular. It’s built from aluminum and was conceived to go to the back of the beyond, where adventure beckons and Vessel Assist doesn’t operate. Aside from commodious and cushy accommodations, the boat offers grid autonomy, ocean-crossing range, and cargo capacity to match the mission of hauling a 26 ‘ (7.92m) tender, a 17 ‘ (5.8m) skiff, a two-person submarine, a four-seat ATV on the main deck, and a small helicopter on the flight deck aft.

The boat was commissioned by Brian Schmitt, 67, a real  estate executive in the Florida Keys, who pilots his own plane to commute to the Bahamas, where he keeps Hippocampus , his current 57 ‘ (17.37m) cold-molded wood/epoxy catamaran. I asked him about the jump from 57 ‘ to 110 ‘ . “I never thought I’d have the ability to do that in my own boat until probably the last few years,” he replied, adding that “it would be 120 ‘ [36.58m] if I had to do it today.”

Its predecessor, Hippocampus, built in wood/epoxy, was launched in 2003. At 57′ (17.37m), it is about half as long as H-2, but with 22,500 miles under its keels, it was a useful starting point for designing the new vessel.

Wearing shorts and a shirt with the new boat’s name and logo to our meeting, Schmitt talked openly about his project, which he manages as attentively as his real estate brokerage with 130 agents. Communication is his thing, responding to e-mail questions in near real time (in ALL CAPS) and talking to contractors directly. No project manager.

A passionate diver who habitually explores remote and exotic locales, Schmitt said he was happy with the first Hippocampus , which has three staterooms and cruises at 15 knots on twin 370-hp Yanmars. “It was the vehicle that got our 17 ‘ tender wherever we needed it.” But running the little boat 60 or 70 miles a day lost its charm. “One of the things I wanted was a twin-engine tender that would have more room for dive gear. That ended up being a 26 ‘ Calcutta, so I needed a bigger mother ship.”

With accelerating climate change, the carbon footprint of ships and large yachts is under scrutiny, but hydrocarbons still win when speed, range, and payloads are priorities. While H-2 doesn’t break the mold there, Schmitt pointed to the project’s virtues as a U.S. domestic build. “You can’t complain about global warming when you’re flying around in your G500 jet that’s contributing more CO2 emissions than anybody else in the world,” he said. “You can’t complain about all the boats being built in Germany, The Netherlands, and Italy, and then go buy a boat [there].” Schmidt wanted to build locally, keeping jobs and money in the U.S. Besides, he noted, this approach simplified communications and enabled him to personally check on progress during COVID. Perhaps most importantly, he could pick a team of trusted and compatible mates to turn his dream into a boat.

The vast build hall left vacant when Gunboat left Wanchese, North Carolina.

He selected John Marples, a fellow pilot, inventor, and multihull specialist for the design and Felix Herrin to build H-2 . Both men had worked for him on Hippocampus , and their familiarity helped when meeting today’s challenges, such as damaging trade tariffs that drove up aluminum prices, and a pandemic that killed millions, wreaked havoc on global supply chains, and caused labor shortages in industrial sectors. These factors have conspired to delay H-2 ’s launching by roughly two years and counting.

Advantage Aluminum

A key decision early on was to build in aluminum, which promised a robust structure but required extra steps to deal with corrosion and noise mitigation. “Construction was reduced to something simple—a V-bottom deadrise model, stretched out,” Marples explained. “There wasn’t any benefit to round bilges on an aluminum boat. You’d have to add internal structure to support the flat panels, and it drives the cost and difficulty of construction way up. We’re talking about a speed-to-length ratio of 2 or less, which is not a big deal. His current boat would do a speed/length of about 3, so the extra length means that you’re never really pushing the boat that hard, so shape was not a huge consideration.”

Marples and Herrin go back at least three decades to their mutual acquaintance with naval architect and boatbuilder Dave Dana, who assisted Marples with the hull design for Admiral Pete , a catamaran passenger ferry still serving Puget Sound. Herrin works with different construction materials, but having built crew boats for Petróleos de Venezuela (PDVSA) at Sea Force in Palmetto, Florida, he has spent considerable time with aluminum.

Taking a break during IBEX 2021 are builder Felix Herrin (left) and owner Brian Schmitt. H-2 is their second joint project with designer John Marples.

The structural components on H-2 are 5083-H32 alloy aluminum plate and extrusions of 6061-T6 alloy. Scantlings, materials, and weldment comply with the American Bureau of Shipping’s (ABS) 2016 design guidelines for pleasure motoryachts. Hulls and wing structures have transverse frames and bulkheads spaced on 36 “ (0.91m) centers. Those frames are supported by substantial centerline vertical keels (CVKs) welded atop twin 3 “ x 8 “ (76mm x 203mm) solid extruded-aluminum-bar keels. Intermediate subframes in the forward and aftermost hull compartments strengthen the hulls for operating in ice. Schmitt indicated he wants to traverse the Northwest Passage. For the same reason, there’s 3⁄8 “ (10mm) plate running the length of the boat above and below the waterline.

The topside and underwing plating is primarily ¼ “ (6mm), with areas of 5⁄16 “ (8mm) to strengthen slamming zones in the bow. The main deck plating is also 1/4 “ while the foredeck plate is specified at 5⁄16 “ . The bottom plating is 5⁄16 “ in the aft two-thirds of the hull and 3⁄8 “ forward. “We built all the frames and bulkheads first, then scarfed together the keel sections [and] lined those up on the bunks that we built on,” Herrin explained. “We welded the CVK on top of the keel, then started installing frames.”

Hulls and wing structure have transverse frames and bulkheads on 36″ (0.91m) centers. The hulls are supported by centerline vertical keels.

Herrin said he changed aluminum suppliers midway through the project, sourcing from Bayou Metal Supply , an ISO 9001:2015–certified distributor in Slidell, Louisiana. “We sourced the material from Greece and from domestic suppliers,” said Taylor Smith, who handles Bayou’s sales. Tariffs, he said, did not slow down business much, but the aluminum cost more. “Felix sent cut files. We had the material in inventory, we cut it, processed it on a router, and shipped it on time. Everything flowed well.”

Naval and structural engineering and detailing was contracted out to Van Gorkom Yacht Design in Portsmouth, Rhode Island. “My first responsibility was looking at structures,” Geoff Van Gorkom said. “Given that this is an aluminum yacht, we can do literally all the structures in 3D and have all the metalwork precut before it came into the yard. All the frames and longitudinals and all the primary structure were precut, which saved huge amounts of time.” Van Gorkom said he uses Rhino 3D and some of the numerous modules such as Orca 3D for hydrostatics and hydrodynamics, and 2D AutoCAD to produce construction details.

Helping save time and money, 3D-modeling allowed frames, longitudinals, and the primary structure to be cut before being sent to the building site.

Van Gorkom observed that H-2 is not a fussy high-performance vessel that needs minimum weight to achieve maximum speed. Besides ABS guidelines that address torsional loads in catamaran structures, he also consulted A.L. Dinsenbacher’s paper “A Method for Estimating Loads on Catamaran Cross-Structure” ( Marine Technology , Vol. 7, No. 4, October 1970) to estimate load conditions in beam and quartering seas. “This is going to be a very stiff boat. It’s going to be a very strong boat simply because it has to be, and that was one of the criteria that Brian put out there right from the very start of the project. The boat is sturdy and stout, a strong expedition yacht.”

Van Gorkom also engineered the setup for a folding deck crane housed under a flush hatch in the helideck on the port side to launch and retrieve the two-man submarine or the ATV. “It’s basically an enclosure that opens up, so the crane extends out,” he explained. “It comes up on a telescoping pipe to swing out and pick up something from the side of the boat.” It required support from beams on each side of the crane and cutting a slot in the helideck for the lifting bridle so the loads can move inboard or outboard. On the starboard side, the 5,500-lb (2,492-kg) Calcutta tender is an even heavier load moved by twin overhead beam cranes. The 17 ‘ Twin Vee is launched and retrieved from the foredeck with a 2,500-lb-capacity (1,153-kg) crane.

Catamarans are known to be weight-sensitive, so how will H-2 handle the weight of all the toys and high superstructure? The arch over the flybridge is 33 ‘ (10.05m) above waterline, Van Gorkom confirmed. “Add another 10 ‘ [3.05m] for the radar, mast, etc., so a comfortable bridge clearance would be around 45 ‘ [13.7m].” Marples conferred with Van Gorkom about the effect of the added weight on the center of gravity, which was deemed “almost imperceptible,” Marples remembered. A quick calculation suggests that a 5,500-lb deck load is equal to only 1.57% of a full-load displacement given as 350,000 lbs (158,550 kg).

High Power, Low Noise

Van Gorkom hired engineers at HydroComp to evaluate the design’s hydrodynamics and propulsion systems, including the influence of hull-shape parameters and demi-hull spacing on resistance. HydroComp also offered a speed-power prediction to aid with engine selection and recommended optimum shaft rpm and propeller parameters. Technical director Donald MacPherson, who prepared the report, outlined the process and findings: “Particularly interesting for this project was the use of its novel analytical distributed volume method [ADVM] for the vessel’s resistance modeling. This 2D technique (between parametric methods and CFD) uniquely allows for assessment of the influence of local sectional area curve regions (such as ‘shoulders’ or inflections) in wave-making drag. It also directly evaluates the effects of catamaran hull spacing.” HydroComp helped optimize the hulls by identifying the regions that contribute most to wave-making drag, and securing a 3% reduction in total drag at the design speed by making what MacPherson called “very minor changes to the immersed volume distribution.”

Rob Ayers works on the installation of the starboard engine’s Evolution Marine Shaft System that will be fitted with a 36″ (0.91m) five-blade propeller.

That simulation was mapped to benchmark performances of four similar catamarans, and the process was run for two design variants, followed by a propulsion simulation for partial-load conditions. The hull-spacing study concluded that the originally designed 35 ‘ (10.7m) beam remained suitable despite the boat being 20 ‘ (6.1m) longer than originally drawn. The chosen propulsion system comprises two MTU 10V 2000 M96, 1505-mhp diesels with ZF 3000 flange-mounted marine gears, providing an estimated top-speed range of 20–22 knots, cruising speeds of 12–15 knots, and 10–13 knots for long-range voyaging. Actual performance will be established during sea trials.

The recommended propeller specifications developed by HydroComp were for five-blade models with 36 “ dia­meters. HydroComp applied Prop­Elements, a wake-adapted propeller-analysis tool, to determine the advisability of installing a nozzle or shroud to restrict transmission of pressure pulses to the hull and to create a more uniform inflow. This would reduce interior noise but would increase appendage drag and power demand. Schmitt said he will wait to see if cavitation or prop noise is an issue before making a final decision.

He invested heavily in noise and vibration mitigation, knowing that an aluminum boat won’t provide the natural sound-dampening of a wood/epoxy structure like that of his first Hippocampus . Consulting with Soundown of Salem, Massachusetts, Schmitt wanted to replicate what worked well on his old boat, starting with the Evolution Marine Shaft System, in which the prop shaft runs in an oil-filled tube and uses roller and needle bearings instead of standard water-lubricated bearings. “You have a lot less shaft noise, but one of the primary benefits of an integral thrust bearing is that it transmits all the thrust directly into the hull, as opposed to pushing on the gearbox or the engine and gearbox combination,” said Sam Smullin, Soundown’s marketing and quality assurance manager. “It allows for a much softer engine mounting, so you reduce the noise from the shaft itself and get a much quieter engine installation, which reduces structure-borne noise.” Because of the relative weight sensitivity of catamarans, Smullin said, “it’s particularly important to do a really good job on the driveline.” His father, Joseph Smullin, president of Soundown and J&A Enterprises Inc., an engineering firm for noise and vibration control, estimated that this could reduce driveline noise levels by 5 dBA to 10 dBA compared to a conventional system.

Clemente Perez, one of Herrin’s build crew, works on the interior. The extensive sound and thermal insulation includes foam sprayed into the cavities.

Soundown also looked at the two 38-kW Northern Lights gensets, which have double-isolation mounts to reduce structure-borne noise. The firm also recommended structural changes to ensure that the mount foundations were as stiff as possible.

Energy from propulsion or generator engines invariably transmits to the boat structure and then resonates through big, flat panels like bulkheads, decks, ceilings, and liners, causing the familiar vibrating rattle. To dampen those vibrations, Herrin said he used Roxul, a lightweight, semi-rigid stone-wool insulation for fire resistance and sound control. His crew also sprayed cavities with Dow Froth-Pak, a quick-cure polyurethane foam for thermal insulation, and installed Sylomer (a microcellular PUR-elastomer) between the structural components and the floors, walls, and panels. “We glued the Sylomer, which is kind of a spongy foam, to the structure of the boat, and then the plywood of the subfloors and walls are glued to that,” Herrin explained, adding that this created a floating interior without any fasteners.

The plywood, called QuietCore, is a composite sandwich panel comprising marine plywood skins and an acoustic damping layer that converts acoustic energy into small amounts of heat that are dissipated. Soundown claims that an 18mm (0.7 “ ) QuietCore bulkhead can reduce noise transmission by up to 10 dBA, an audible reduction 50% greater than with regular marine plywood of equal thickness.

Electricity for a Small Town

Going off grid on H-2 does not mean anyone will suffer, as long as the electrical system keeps powering the boat’s myriad house loads—hydraulic Maxwell windlasses and thrusters; a Webasto air-conditioning system; two full-size stand-up freezers, two refrigerator freezers, and two under-counter refrigerators in the galley, all by Vitfrigo; Krüshr compactors for recyclables and garbage; Headhunter sewage-treatment system; Alfa Laval fuel-polishing system; two FCI watermakers; a complete set of Garmin navigation electronics with full redundancy; and a Böning vessel control and monitoring system.

Two Northern Lights 38-kW gensets are the heart of H-2’s AC system, which also includes a 37-kW Atlas inverter to connect to shore power in foreign ports.

Much of the AC side was designed and specified by Ward’s Marine Electric in Fort Lauderdale, Florida, in cooperation with OceanPlanet Energy of Woolwich, Maine, and principal Bruce Schwab, who helped design and integrate the DC components. “Today there’s a big trend in the industry to use shore-power converters as inverters and superlarge lithium-ion battery banks to provide power, at least temporary power, for major loads like air-conditioning, chiller plants, and things like that,” said Ward Eshleman, chairman of Ward’s Marine Electric. “So, rather than using only smaller inverters and synchronizing them and stacking to get additional kW, the trend for the larger vessels is to use shore-power converters as inverters. There is an inverter bus in the main switchboard.”

True to its go-anywhere mission, H-2 was fitted with an Atlas 37-kW inverter to connect to shore power in places that do not serve 60 Hz, 240V single-phase power. “We can take anything from 90V to 400V and pretty much anything from below 50 Hz to the 60 Hz and single- or three-phase,” Herrin explained.

Eight GTX24V315A-F24 lithium-ion batteries from Lithionics are split between a house bank that can run all DC loads for at least 24 hours, and an emergency bank to operate critical DC loads—display screens, radios, nav lights—for 24 hours. The boat is equipped with 10 Solara Ultra-S 160W panels paralleled in two groups of five each, connected to two Victron SmartSolar MPPT 100/50 solar controllers to charge the house bank. Given enough sunshine, solar and battery power should be “capable of running lights and refrigeration but not air-conditioning or heating,” Schmitt said. “Since we will likely spend most of our time in the tropics, we did not believe that solar power alone could do the job we needed.”

OceanPlanet Energy specified four Victron Buck-Boost DC-DC converters, two for each engine, to help charge the house bank from the starter batteries without having to modify the engines’ stock alternators, which would have voided the warranty. “The converters activate based on the input voltage from the starting batteries,” Schwab explained. “With lower rpm, the alternators would not produce enough current to feed both converters without the starting-battery voltage dropping, turning the converters off. Then the voltage will rise, the converters turn on again, drop the voltage, turn off…over and over. Staggering the input voltage cut-in, hopefully starting the converters one at a time, will more smoothly supply power to the house bank across the engine/alternator rpm range.”

OceanPlanet Energy specified the DC system including DC/DC converters and hefty battery banks to power house loads and critical electronics.

There are two 4,500-watt 240V split-phase engineroom-ventilation fans connected to two Victron Quattro 5-kW 24V inverter-chargers configured for 240V/120V split-phase AC loads. They can accept AC inputs from two sources (shore power or generators) and automatically connect to the available source. “In the event of a grid failure or power disconnect, they take over the supply to the connected AC loads by inverting from the Lithionics house-battery bank,” Schwab said.

“It’s more complicated than that,” according to Herrin. “Typically, we’re going to be operating with the A-bus and the B-bus tied together, so we can power everything with one generator. The B-bus actually passes current through the Victron inverter-chargers on its way to the load. We have the ability to split the A-bus and the B-bus and run the A-bus on one generator and the B-bus on the other in the few instances we’re exceeding the capacity of one of the generators. If we lose both generators, then the essential loads are still going to be carried,” meaning engine vents or water pumps.

Redundancy and emergency backups also figured largely in the deliberations of John McKay, manager of the Switchgear Systems Division at Ward’s Marine Electric and point man for this project.

One of his challenges was limiting the voltage drop in the estimated 53 ‘ (16.2m) cable run between engines, which in an emergency allows the starboard engine to be started from the port battery and vice versa. “For a starter group, you can allow a 20% voltage drop,” McKay said and noted that starting the engines requires 720 amps, while the gensets needed only 200 amps. “I was keeping the 720-amp current between 7% and 11% voltage drop, getting up to some pretty good-sized copper. Some sections of the run were 240mm2 [500MCM] cable.” Knowing that the boat is capable of going to high latitudes, McKay recalled his youth and the frigid winter mornings in Massachusetts, “where you can crank a diesel all day long at a low rpm, and it’ll never start. You just need to turn it over one or two times at a higher rpm, and it’ll be running. So, I was making certain that the starter was going to crank at the highest rpm possible and not lose it all to voltage drop.”

Protecting Assets and Finishing the Job

No matter how fast or how far H-2 will travel, corrosion caused by galvanic current between dissimilar metals, by stray currents or by electric fault, is an enemy that needs to be kept in check. That’s the calling of Ted Schwartz, who runs Electro-Guard (Mount Shasta, California). He’s one of the country’s foremost experts on cathodic protection, and also served on ABYC’s E2 Cathodic Protection Project Technical Committee.

“We designed the system and supplied all the equipment and steered them through the installation,” Schwartz said. It’s a 15-amp impressed-current-cathodic-protection (ICCP) system, model 715 A-2, with three anodes and two reference cells. Regarding the boat’s Evolution shaft system with driveshafts running inside an oil-filled tube, Schwartz said: “It was a real challenge because you can’t actually make contact with the propeller shaft on the inside of the boat.” He consulted with Soundown and found a solution. “At the coupling on the inboard end of the tube, a bit of the shaft stuck out through the seal,” Swartz said. “There’s this coupling that Soundown built that fastens to the shaft, and we asked them to provide a surface on that coupling where we could put our silver slip rings on [to provide an electrical connection] to protect props and shafts.”

Every anode can deliver up to 5 amps of current using its own current controller that receives a signal from the main controller, which determines exactly how much current each anode will put out. The entire system consists of three anodes, three current controllers, the main controller, and a separate monitoring station connected to the controller by signal cable. Later, Schmitt also ordered a backup system employing aluminum sacrificial anodes.

On catamarans, the company installs a reference cell aft near the prop of each hull, and an anode on the aft section of each hull, and one anode amidships on the inboard side on one hull.

Chromate, two layers of epoxy, copious amounts of fairing compound, and various primers rendered the surface fair and ready for a yacht-quality paint job.

At the time of this writing, the vessel had been shot with chromate and two layers of epoxy before approximately 500 gal (1,893 l) of fairing compound and 325 gal (1,230 l) of various primers rendered the surface fair and ready for a yacht-quality Alexseal paint job with 35 gal (132.5 l) light ivory, 24 gal (91 gal) stark white, and 2 gal (7.6 l) cordovan gold. Parallel to the exterior, construction was on the home stretch with installation of the crew quarters and the saloon overhead. On the systems side, pressure checks were performed for hydraulics and plumbing.

Since H-2 is a much larger and more complex vessel than the original Hippocampus , with a multitude of systems that need to be managed, monitored, and maintained, I was curious how many crew Schmitt was planning to hire to help run his new boat. He said he consulted with captains and headhunters, and “the consensus is three or possibly four at most. I just completed my 100-Ton Masters and will build time on the new boat as well. We won’t charter and are not accustomed to being cooked for or served or having our beds made and all that. So mostly I’m looking for a qualified captain and engineer to maintain the systems.”

Little surprise that a hands-on operator like Schmitt does not want to cede too much of the game he loves to play. But as big, bold, and broad-shouldered as H-2 will be when she finally emerges from the old Gunboat shed in Wanchese, the proud owner is quick to remind anyone that it’s still “a vehicle to get the toys wherever.”

H-2 : The Designer’s View

H-2 ’s owner, the adventurous Brian Schmitt, has dived into deep caves to see submerged caverns, hand-fed large sharks that would normally view him as food, and spent years in his off-time exploring Caribbean archipelagos in Hippocampus, his current 19-year-old 57 ‘ (17.4m) power catamaran. Nearing retirement age, he gave the order for his “ultimate” yacht.

The foldable hydraulic deck crane to launch and retrieve a two-man electric submarine or an all-terrain vehicle required cutting a slot in the helicopter deck for the lifting bridle.

The first talk about the new design was between the owner, the builder, and me. As we discussed the mission of the boat, it became clear that it would fall into the category of expedition vessel with more guest staterooms, more range, and more room for equipment than his old boat. Brian defined the function of the vessel as a carrier for a 26 ‘ (7.92m) twin-outboard catamaran, an outboard skiff, a small car, and a small helicopter, which needed a flight deck. This vessel was to be used with family and guests while also serving as an operations base for outbound travel by air, land, or sea.

Aside from commodious accommodations, a key requirement was comfortable motion on rough seas. This was to be a catamaran, like his current boat, which offers extensive real estate afloat in a seagoing vessel. The only restriction for the new design was a beam no greater than 35 ‘ (10.6m) to fit the largest Travelift.

The trade-off for overall beam width involves room versus roll motion. A wider catamaran responds more quickly to roll in seaways but with less amplitude, whereas a narrower beam rolls more slowly with slightly more amplitude. The slower roll is preferable as long as overall roll stability is maintained. Roll in catamarans is unlike roll in single-hulled vessels. Because the vessel is supported by two buoyancy chambers (hulls) with distance between them, motion has little to do with roll inertia, but rather with response of the hulls to the seaway. Each hull responds to a passing wave independently by heaving (up/down) and rolling, which is a circular motion around the center of gravity (CG) that translates to lateral motion when standing above the CG, especially high up on the bridge. Power catamarans, unlike sailing catamarans, do not require wide hull spacing to generate righting moment (to support a sail plan), so they can have closer hull spacing, which still preserves sufficient stability, slows wave-response roll characteristics, and takes up less space in port.

One of the expected routes for this vessel is the Northwest Passage over the top of North America. Boats venturing there can expect floating ice, so we added thicker hull plating at the waterline and an ice-separation chamber on the cooling water intakes. We also designed the hull to give the propeller protection by positioning it behind a deep canoe-stern afterbody with no exposed shaft. A rudder horn, below the propeller extending aft from the hull, adds support for the rudder and protection for the prop. This configuration is useful as a hedge against the possibility of grounding. In fact, this boat can be careened on the beach between tides if necessary for repairs. The hull includes a strong, deep, vertical keel structure that allows for blocking anywhere along its length.

Speed and range became the largest determinates of the design. A maximum range of 4,000 miles at 15 knots (enough to cross the Atlantic Ocean) was proposed. Catamarans are easily driven at modest speeds due to lack of significant wave resistance by narrow hulls. A preliminary speed prediction analysis showed that we would be in the ballpark with about 1,400 hp (1,050 kW) and 5,000 gal (18,925 l) of diesel per hull. The final installed fuel capacity is 12,500 gal (47,313 l).

The general arrangement plan shows crew quarters in the hulls, three guest cabins, office, saloon, and galley on the main deck and owner’s suite on the bridge deck level.

A totally new design normally goes through a lengthy proposal and critique cycle between designer and client, especially if the client is knowledgeable and involved. The vessel’s first iteration started at 90 ‘ (27.43m) LOA, but it became evident that it needed more length to relieve a number of ills. After adding 10 ‘ (3.05m) we saw improvements, but it wasn’t until the 110 ‘ (33.5m) length proposal that we felt all the requirements had been satisfied: more slender hull shape, more open interior space, and better placement of machinery and tankage. The flight deck for the helicopter became larger, and the forward superstructure fairings gave the boat a sleeker look. And at 110 ‘ we achieved an efficient length versus waterline beam ratio that reduced wave drag and fuel consumption at the target cruise speed.

While beam remained at 35 ‘ , lightship displacement increased significantly to 230,000 lbs (104,190 kg). Accommodations now include crew quarters for four persons in the bows; three double guest cabins and a ship’s office forward; a large saloon amidships with adjacent galley, and a dive and a storage locker aft on the main deck. The upper deck is arranged with a full-width-bridge steering station forward, protected by a Portuguese bridge, and a master stateroom with en suite bathroom aft. The flight deck extends aft of the master stateroom. Access to the upper deck is by either a staircase from the foredeck, an interior staircase adjacent to the ship’s office, or by stairs from the starboard side deck.

The largest variable weight on the boat is fuel, so the tankage is located amidships to minimize its influence on trim. Engine and machinery rooms aft of the tankage take up the remaining spaces all the way to the transoms. Other amenities include a utility area aft of the crew quarters port side with storage and washing machines, and a walkway through the tank spaces and enginerooms to the boarding decks at each transom. Another late addition is the flying bridge to aid with shallow-water operation by improving the vantage point to see coral heads and other obstructions. Its protective bimini serves as a mounting platform for lights and antennae.

—John R. Marples

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Van Gorkom Joins C&C 30 One-Design Team as Technical Director

Published on March 17th, 2015 by Editor -->

Known as a high-performance one-design built to tight tolerances, Van Gorkom’s expertise will be invaluable to maintaining maximum consistency in the construction and finish of each hull. In addition, he will be responsible for all of the class’s technical documents. Van Gorkom is a graduate of the University of Michigan Naval Architecture and Marine Engineering Program, and is the designer of high-performance sailing boats including the Mount Gay 30. He is also the principal of Van Gorkom Yacht Design.

“Geoff’s experience with high-performance yacht design is a tremendous asset to the team,” says Randy Borges, president of USWatercraft, builders of the C&C 30 OD. “Our meticulous build team, combined with Geoff’s eye for detail, means that C&C 30 OD owners are assured of a true one-design experience.”

Van Gorkom will be working on location in the Warren, RI, headquarters of USWatercraft.

Tags: C&C 30 One Design , C&C Yachts , Geoff Van Gorkom , Industry

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| Tyumen Tourism Things To Do in Tyumen Tyumen Itineraries Tyumen Hotels Tyumen Trip Planner Plan your customized day by day trip plan for Tyumen. Choose from various experinces categories as adventure, romantic and family and kids friendly for your trip using using Tyumen trip planner. THINGS TO DO HOW TO REACH TOP RESTAURANTS Bahasa Indonesia Slovenščina Science & Tech Russian Kitchen Passage to Siberia: Exploring historic Tyumen Tyumen. View up the Tura River. From left: Church of the Elevation of the Cross, School of Commerce, Trinity Monastery with Church of Sts. Peter and Paul and Trinity Cathedral. September 4, 1999 At the beginning of the 20th century, Russian chemist and photographer Sergey Prokudin-Gorsky developed a complex process for vivid color photography. His vision of photography as a form of education and enlightenment was demonstrated with special clarity through his images of architectural monuments in the historic sites throughout the Russian heartland. Tyumen. View up the Tura River. From left: Annunciation Cathedral (demolished); Church of Elevation of the Cross; Church of the Ascension & St. George; Trinity Monastery. Summer 1912 In June 1912, Prokudin-Gorsky ventured into western Siberia as part of a commission to document the Kama-Tobolsk Waterway, a link between the European and Asian sides of the Ural Mountains. The town of Tyumen served as his launching point for the journey north to Tobolsk, on the Irtysh River. Cathedral of Icon of Virgin of the Sign, south view. August 29, 1999 During his journey, Prokudin-Gorsky took several extraordinarily valuable photographs of both Tyumen and Tobolsk . My photographs of Tyumen and Tobolsk were taken in the late Summer of 1999. Humble beginnings Cathedral of Icon of Virgin of the Sign, southwest view. August 29, 1999 Considered the earliest permanent Russian settlement in Siberia, Tyumen was founded in 1586 on the site of a Tatar encampment at the confluence of the Tura and Tiumenka Rivers. The initiative for its creation came from Boris Godunov, the power behind the throne of Tsar Fedor (son of Ivan the Terrible) and, eventually, to become tsar himself in 1598.  Cathedral of Icon of Virgin of the Sign, south facade. August 29, 1999 Godunov was closely allied with the Stroganovs, who from their commercial center at the northern town of Solvychegodsk had sent a detachment of Cossacks commanded by a certain Yermak deep into Siberia to challenge the power of the ruler of Siberian Tatars, Khan Kuchum. Although the precise dates are open to question, it appears that, in the Fall of 1581, Yermak captured Chingi-Tura (later Tyumen), but abandoned his conquest, in order to proceed straight to Kashlyk, capital of Khan Kuchum, whom Yermak defeated in 1582 during a battle near the Irtysh River.  Church of the Miraculous Image of the Savior, southwest view. Originally built in 1794-1819, this is an excellent example of "Siberian Baroque" architecture. August 29, 1999 Following Yermak’s death in a surprise Tatar raid in 1584, his conquests remained temporarily unconsolidated after his death. Nonetheless, Boris Godunov was aware of the enormous significance of Siberia and launched a campaign to found settlements, as he did in other border areas of the medieval Muscovite state. Church of the Ascension & St. George, south view. Originally built in 1770-89, defaced during the 1930s & restored after 2003 with rebuilding of bell tower. September 4, 1999 Like other early Russian Siberian towns, Tyumen originally served as a garrison fortress for Cossacks and other troops, who protected newly developing trade routes in all directions. The eastern connections with China gained particular importance during the 17th century.  Location, Location, Location Church of the Elevation of the Cross, southeast view. Built in 1774-91. August 29, 1999 Tyumen’s location on the Tura River also provided a direct link westward with the gateway town of Verkhoturye founded by Boris Godunov on the Asian side of the Ural Mountains in 1598. And to the east and north of Tyumen, the Tura River merges with the Tobol, which in turn joins the great Irtysh near Tobolsk. By virtue of its location, Tyumen was destined from the beginning to play a significant role in the Russian development of Siberia. City Council Building. Originally built in 1828-33 in a simplified neoclassical style. Chiming clock was added in 1857. August 29, 1999 The opening of Siberia for Russian colonization during the late 16th and 17th centuries was an epic confrontation between the vast distances of this severe land and the enterprise of Russian merchants, whose commercial interests coincided with the tsars’ appetite for eastern expansion. Although its rivers were only tributaries of the Irtysh (itself a tributary of the great Ob River), Tyumen was well situated to utilize Siberia’s vast water network.       Kolokolnikov house, corner of Republic Street 18 & Turgenev Street. Originally built in 1804 by the merchant Ivan Ikonnikov, this superb example of classical wooden architecture was acquired in 1888 by the merchant Ivan Kolokolnikov, who modified the original design. August 29, 1999 Like most early Russian towns in Siberia, Tyumen originally served as a fortified settlement for Cossacks and other troops, who in the 17th century protected newly developing trade routes, particularly with China.  Nikolai Masharov mansion, Lenin Street 24. Built in the late 19th century by the founder of the Tyumen Ironworks. August 29, 1999 When the southern boundary of Moscow’s Asian territory became more settled during the 18th century, Tyumen’s importance increased for the development of transportation as well as small commercial and industrial enterprises. Its status as a transportation nexus also involved the exile system, which sent convicts and political exiles throughout Siberia. Orthodox Church HQ Commercial building (corner of Republic & Kirov Streets) built by the merchant Nikolai Yadryshnikov in 1897. Example of highly decorated "brick style" favored for commercial buildings in late 19th century. August 29, 1999 As a regional administrative point for western Siberia, Tyumen rapidly became a center of the Russian Orthodox Church. Its Trinity Monastery was founded in 1616 on the high right bank of the Tura River. Originally dedicated to the Transfiguration, the monastery was a modest collection of log buildings until its transformation in the early part of the 18th century by an energetic Ukrainian prelate, Bishop Fyodor Leshchinsky.           School of Commerce (now Engineering Institute). Completed in 1914 during a Siberian building boom stimulated by development of commerce along the TransSiberian Railway. August 29, 1999 As an ally of Peter the Great, Bishop Fyodor saw architecture as a reflection of a broad cultural transformation and the Church of the Trinity that he built at the monastery in 1709-1715 is Tyumen’s earliest surviving building. Gutted during the Soviet era, the Trinity Church has been renovated (with modifications) together with its neighbor, the Church of Saints Peter and Paul, built in 1741-1755. Fortunately, Prokudin-Gorsky photographed both shrines in 1912.  Tekutyev Crafts School, Dzerzhinsky Street 2. Completed in 1914, the building is a fine example of provincial "style moderne". August 29, 1999 These early examples of a provincial baroque style served as a model for other 18th-century churches in Tyumen, culminating with the lavish Cathedral of the Icon of the Virgin of the Sign (Znamensky), which has recently been splendidly refurbished. Built in several phases between 1768 and 1891, the cathedral displays the florid decoration typical of much of Siberian church architecture.             Submitting Siberia Shaichik mansion, Lenin Street 47. Built in 1914 by Yankel Shaichik, major store owner & trader in dry goods. August 29, 1999 The daunting vastness of Siberia’s reaches gradually submitted in the 19th century to new forms of transportation. The first steamboat to ply a Siberian river was constructed here in 1838.  Burkov house, Dzerzhinsky Street 30. Built at turn of 20th century by Vasily Burkov, trader in Siberian grain on an international level (China, Japan). August 29, 1999 The greatest impulse for economic growth came with the completion of a railroad from Yekaterinburg, on the east slope of the Ural Mountains in 1885. This line ultimately became an important segment of the Trans-Siberian Railroad, transporting the wealth of Siberia’s forests, mines and new agricultural regions, as well as leather and other products of local factories.  Kozlov house, Turgenev Street 9. Built at end of 19th century by Ivan & Maria Kozlov, local merchants. August 29, 1999 At the turn of the 20th century, over half a million settlers passed through the town toward Siberia’s open, fertile lands. Fortunately, remnants of this period have survived in the central part of the city.  Nikolaevskoe (Nicholas) Primary School, Lenin Street 5. Wooden building constructed in 1897 as part of a public schools network. August 29, 1999 This memory of the past is especially evident in the city’s remarkable wooden houses, with elaborate framed and carved window surrounds in a style specific to Tyumen. These massive window constructions often include carved panels below the sill as an additional decorative and protective device. Wooden houses. L:eft: Volodarsky Street. Built at end of 19th century, the house has exuberant carved decorative window frames. Right: Komsomol Street. Built around 1900 as a wing of the A. G. Andreev estate, this small structure displays remarkable examples of decorative fretwork. August, 1999 Their solid construction allowed rows of large windows in wooden houses even in this harsh climate, thus bringing maximum available light to interiors during the long Siberian winters. The present & future   Log apartment house, no. 57 (street unknown; house may have been demolished). Fine example of carved window frames on typical log structure. August 29, 1999 Tyumen today is the capital of an enormous province - stretching from Kazakhstan in Central Asia north to the Arctic Ocean - that is one of the world’s richest energy producing regions. Tyumen has benefited from this bounty of natural resources and is at present one of the few Siberian cities to show major population growth: from slightly over half a million in the 2002 census to some 850,000 in the latest estimate. As usual in Siberian cities, most residents live beyond the historic center in Soviet-era housing developments.            Minshutin house, Vodoprovodnaia Street 43. Built in 1891, the house was restored in 1998 by architect A. Klimchenko with decorative window frames carved by Vadim Sheetov. September 4, 1999 A walk through the historic center of town shows vivid contrasts of modest pre-revolutionary brick and wooden buildings, rarely more than two stories in height, with ponderous Soviet buildings and sleek new commercial centers. Some of the new structures are private apartment houses, others are banks and office buildings and still others form a part of the expanding Tyumen State University.  Minshutin house, detail of decorative carving by Vadim Sheetov. September 4, 1999 In the early 20th century, Russian photographer Sergey Prokudin-Gorsky developed a complex process for color photography. Between 1903 and 1916, he traveled through the Russian Empire and took over 2,000 photographs with the process, which involved three exposures on a glass plate. In August 1918, he left Russia and ultimately resettled in France where he was reunited with a large part of his collection of glass negatives, as well as 13 albums of contact prints. After his death in Paris in 1944, his heirs sold the collection to the Library of Congress. In the early 21st century, the Library digitized the Prokudin-Gorsky Collection and made it freely available to the global public. A few Russian websites now have versions of the collection. In 1986, architectural historian and photographer William Brumfield organized the first exhibit of Prokudin-Gorsky photographs at the Library of Congress. Over a period of work in Russia beginning in 1970, Brumfield has photographed most of the sites visited by Prokudin-Gorsky. This series of articles juxtaposes Prokudin-Gorsky’s views of architectural monuments with photographs taken by Brumfield decades later. If using any of Russia Beyond's content, partly or in full, always provide an active hyperlink to the original material. to our newsletter! Get the week's best stories straight to your inbox Tobolsk: Exuberance of Siberian Baroque U.S. professor continues photographic legacy of Prokudin-Gorsky in new book Discovering the historic neighborhoods of Perm This website uses cookies. Click here to find out more. 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Smith – hydro & powering analysis Northcoast 27 – hull lines development Fish Eagle – US Coast Guard stability certification VG30 – research and development, tank testing & VPP optimization F&S Boatworks – hull lines development for F&S57, 61 & 70 foot sportsfishing boats The Atlantic Boat Company – hydro studies, powering analysis & hull form development Burke Design – repowering of a Trojan 40 Jutson Mount Gay 30 – rating analysis and optimization Thompson 37 (Rumours) – generated new polars after the 2007 refit Leadership 44 – rating analysis and optimization Duffy 26 – hull extension study New Harbor 28 Northcoast 27 F&S Boatworks Atlantic boat company. Burke Design Jutson Mount Gay 30 Thompson 37 Leadership 44 Keels & Rudders Kit-Plan Packages 426 IMAGES H2 Luxury Super Yachts from Van Gorkom Yacht Design Luxury Super Yachts from Van Gorkom Yacht Design Luxury Super Yachts from Van Gorkom Yacht Design Luxury Super Yachts from Van Gorkom Yacht Design Performance Yacht Designs & Engineering VIDEO J Van Gorkom glasses 24 09 01 DCCC English Worship Service: “The God of All Comfort” (2 Corinthians 1:3-11) 24 03 29 DCCC Good Friday Service The God of Hope KIMT Tele-radiology in Osage Story SL Yacht for Billionaires COMMENTS Performance Yacht Design & Engineering With over 30 years of industry knowledge and experience, Van Gorkom Yacht Design is dedicated to the concept of innovative high performance yachts, both power and sail. Small Boat & Yacht Division . Super Yacht Division . Refit & Restoration Division. 305 Riverside Street Portsmouth, RI 02871, USA Luxury Super Yachts from Van Gorkom Yacht Design Van Gorkom Yacht Design has conceived a unique breed of Expedition Cruising Vessel (ECV), where form and function have been seamlessly blended together to create the ultimate in adaptability, cruising comfort and design practicality. This ilk of power catamaran will be the ideal platform to accommodate the above mission statement with a bold ... The VG-Mini 6.5 2G After a significant period of research and development, Van Gorkom Yacht Design is excited to be releasing their second generation VG-Mini 6.5 proto. This mini design is a phenomenal little boat and has the potential to dominate the competition and establish a whole new level of performance. All that, and it's available as a kit-plan-package ... Van Gorkom Yacht Design Yachts For Sale and Charter Van Gorkom Yacht Design company profile and searchable list of superyachts, including luxury yachts for sale and for charter by Van Gorkom Yacht Design Van Gorkom Yacht Design Van Gorkom Yacht Design LLC is naval architectural firm dedicated to the concept of innovative performance yachts, both power and sail. We also offer marine engineering services, consulting in composite analysis, structural engineering, scantling development, and performance/power predictions for both sail and motor yachts. 305 Riverside Street. vgyd.com vgyd.com. 131 likes. With over 30 years of industry knowledge and experience, Van Gorkom Yacht Design is dedicated to the concept of innovative high... VG-Mount Gay 30 The underlying theme of this project has been one of meticulous consideration to the sailing criteria. This included an extensive research and development program by Van Gorkom Yacht Design which, coupled with quality construction by Mark Lindsay and Boston Boat Works, has, we believe, delivered a great little raceboat. Affordable Boat Building with Kit-Plans With this in mind, Van Gorkom Yacht Design have developed a series of kit-plan packages for affordable boat building. These packages make it possible for the amateur boat builder or small boatyard to build a high performance one-off racer for a fraction of what a professional high-end custom boat building operation would charge. The VG-6.5 Mini ... An Aluminum Expedition Catamaran Courtesy Van Gorkom Yacht Design With 110′ LOA, a 35′ beam, and 45′ (33.5m, 10.6m, and 13.7m) of bridge clearance, the H-2 catamaran seeks to make a case for U.S. custom boatbuilding. Hauling toys beyond the horizon is the raison d'être for a rugged go-anywhere catamaran designed and built in the U.S., a notable exception in the world ... Van Gorkom Joins C&C 30 One-Design Team as Technical Director Warren, RI (March 16, 2015) - Naval architect Geoff Van Gorkom has joined the C&C Yachts team as technical director for the C&C 30 One-Design.. Known as a high-performance one-design built to ... Van Gorkom Yacht Design Date Van Gorkom Yacht Design was added to the Boat Design Directory: 6-Dec-2001 Number of Visitors who visited Van Gorkom Yacht Design from the Boat Design Directory: 4026 *Note: Site may be listed in multiple categories, and if so, traffic is for this category only. Historic Snapshots ... Van Gorkom Yacht Design VAN GORKOM YACHT DESIGN LLC is fast becoming a leader in state-of-the-art yacht design and engineering within the marine industry. Through customiz ed solutions , VGYD are providing new perspectives to make our clients' boating passions a reality. VGYD is naval architectural firm dedicated to the concept of innovative high performance yachts ... Van Gorkom Yacht Design LLC Van Gorkom Yacht Design LLC Contact Details. P.O. Box 982 02840 United States. Van Gorkom Yacht Design LLC's Stats. Yachts for sale. undefined. Newsletter. Subscribe. Follow Us. Shop. Visit the SuperYacht Times online shop to view and order the latest market reports and newspaper issues. Marine Engineers & Naval Architects Marine Engineers & Naval Architects. State-Of-The-Art Yacht Designs for over 30 years. Van Gorkom Yacht Design LLC is fast becoming a leader in state-of-the-art yacht design and engineering within the marine industry. Through customized solutions, VGYD are providing new perspectives to make our clients' boating passions a reality. The bourgeois charm of Siberia's oil capital For centuries, Tyumen vied with the nearby city of Tobolsk—once the official capital of Siberia—for the prestige of the region's most important city. Tyumen won in the end, when the Trans ... Tyumen Tourism, Russia Tyumen (Russian: Тюмень; IPA: [tʲʉˈmʲenʲ] ) is the largest city and the administrative center of Tyumen Oblast, Russia, located on the Tura River 2,500 kilometers (1,600 mi) east of Moscow. Composite Engineering & Design Van Gorkom Yacht Design was hired by Collin Harty, to engineer the composite chainplates for his Corbin 41 "Galene". In the process of designing the structure for the chainplates a new righting moment curve had to be created and a new rig plan had to configured. The client's testimonial shows, the experience of building the new ... Passage to Siberia: Exploring historic Tyumen August 29, 1999. William Brumfield. The opening of Siberia for Russian colonization during the late 16th and 17th centuries was an epic confrontation between the vast distances of this severe land ... Yacht Performance Analysis Van Gorkom Yacht Design was contracted by the owner of the S.Y. Smith to assess the motoring performance of the vessel. Freeboard measurements were taken, followed by a hydrodynamic study to determine the yacht's displacement and trim. Based on that information, a powering analysis was performed, which allowed VGYD to make recommendations to ... Tyumen Tyumen (Russian: Тюме́нь tyoo-MEHN) is a city in Western Siberia and the capital of Tyumen Oblast, the second largest region in Russia after Krasnoyarsk Krai, with a population of approximately 600,000 people.. Understand []. Tyumen was founded in 1586 as the first Russian settlement in Siberia. During World War II, the city grew rapidly as many industries relocated further away from ... catamaran gulet motorboat powerboat riverboat sailboat trimaran yacht