black soo sailboat

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Great yacht designs 8 – Black Soo

Black Soo was built by R & W Clark of East Cowes in 1957 for Michael Pruett. In period she was described as a development of van de Stadt’s Zeevalk (his first design of 1949) and Fair Meg of 1955; but van de Stadt moved things along a fair distance again with this radical design and her near sister, Zeeslang . All of them were based around hard-chine construction in plywood; the first, Zeevalk , was effectively an advertisement for van de Stadt’s friend Kees Bruynzeel’s new marine plywood, and she proved a weapon under the right conditions, coming second in class to the overall winner Yeoman in the 1951 Fastnet.

The early post-war period was an era of exciting and rapid developments in lightweight design, with Laurent Giles producing Myth of Malham and the remarkable Sopranino , and even though the trend had slowed by the late 1950s the attractions of the type were by then well established. Zeeslang (design number 58) was also for Bruynzeel, but Black Soo (number 59) was destined for a British owner. She was described as “the nearest thing to a planing boat in the RORC fleet”, and indeed with a good breeze on a deep reach, given a helpful wave face (and despite her narrow beam), she could be induced to plane, with some remarkable claimed speeds resulting.

Her total displacement was about half the weight of just the ballast keel of her contemporary Cohoe III , which was also 26ft on the waterline and described as of “moderate displacement”. Even today a 30ft yacht for offshore racing would rarely displace as little as 1.6 tonnes; the well-known J88 at 8.90m LOA displaces 2.2 tonnes, which puts the nearly 60-year-old design of Black Soo into perspective.

Her cast-iron, hollow fin keel with a swept-tip bulb, described in 1958 as at “the limit of narrowness”, weighed 760kg, giving her a ballast ratio of nearly 48 per cent; it demanded clever design and no doubt a high level of boatbuilding to keep her down to weight. Notwithstanding that the hull was effectively comprised of flat panels, her fine scantlings would have needed a careful touch. Thanks to her very narrow beam her wetted surface area was minimal despite the immersed chine, and she was very easily driven; even the mainsail from a 14ft dinghy that she took as a storm sail on the Fastnet proved too large. Her dead straight sheer line and flat panels gave her appearance an angular modernity, and her good rise of sheer forwards must have helped prevent nose-diving as she ventured offshore, but even so she must surely have provided her crews with a wet ride. The relative lack of flare in the sections probably gave her a useful ability to ride on the chine when heeled, using the immersed topside area to resist leeway.

The combination of flat panels and the hard chine gave her a hollow entry on the waterline, but as Herreshoff’s Alerion and others demonstrate, this is not necessarily a disadvantage. There looks to be just enough angle on the forward sections underwater to help avoid slamming when upright, but as she heeled over that may not have been true, and the qualities of Bruynzeel’s plywood must have been tested at times.

In the original form there was ruthless elimination of excess weight. This was a narrow boat, no question, and had a very limited interior with, as some wit noted, “full crawling headroom”. The four GRP Royal Cape One Designs based on the same design had a nod to convenience with a modestly raised doghouse at the aft end, but the original Black Soo had a low coachroof with transparent plastic panels. With a second tiller extending into the aft end of the cabin, the helm could sit below to steer and still see up to check the trim of the sails.

She was tough; she sailed through a force 8 gale in the ’57 Fastnet that caused Bloodhound to heave-to overnight and Drumbeat to retire after wrecking five winches. Ironically Black Soo then had to retire due to electrical problems; an early example of a problem we might consider a modern curse. Black Soo was based in Ireland for many years from 1962, but as the doyen of yachting correspondents Winkie Nixon noted, she “eventually succumbed to the Irish weather which is murder for even the finest plywood” and was broken up sometime around 1999. Her near sister, Zeeslang , was luckier; after racing in South Africa for 50 years she was restored and is now a “cherished classic” in Switzerland, and was exhibited at the Dusseldorf Boat Show in 2014.

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Review of Black Soo 30

Basic specs..

The Black Soo 30 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The boat can only enter major marinas as the draft is about 1.83 - 1.93 meter (6.00 - 6.30 ft) dependent on the load. See immersion rate below.

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Black Soo 30 is 2.02, indicating that this boat would not be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.8 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Black Soo 30 is about 128 kg/cm, alternatively 722 lbs/inch. Meaning: if you load 128 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 722 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

What is Displacement Length Ratio?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 25m 2 (269 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

We are always looking for new photos. If you can contribute with photos for Black Soo 30 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

TANTON YACHT DESIGN.

Naval Architecture - Marine Engineering - Boat Plans - New Construction - Yacht Sales - Charter. Worldwide. Since 1974.

Thursday, August 18, 2016

Boat of the month. august 2016. "black soo"..

8 comments:

This is a very good post. Just wonderful. Truly, I am amazed at what informative things you've told us today. Thanks a million for that. Foto Wanita Telanjang Pose Nungging

You are welcome. Thank you.

Interesting. I actually live near the Hudson river, up in the northern part of upstate New York, and I sometimes rent a boat from the boat rental company around here next to the river by a park. But they don’t look anything like the boats you show here! I really need to get one of those laugh out loud. Maybe one day.

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Thanks for providing recent updates regarding the concern, I look forward to read more. Los Cabos Yacht Rental

I’ve been searching for some decent stuff on the subject and haven't had any luck up until this point, You just got a new biggest fan!.. Luxury Yachts Cabo

We recently rented a party yacht in Dubai and it was an incredible experience! The yacht was spacious and well-equipped with everything we needed for a fun and luxurious party. The crew was extremely professional and attentive, ensuring that all our needs were met.

Tanton Yacht Design is 50 years old!

  Very hard to believe.  - From being 27 years old to now, and to the future. - Making, in my field one of the oldest Design Firm in America...

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Tanton : Black Soo.

Van de Stadt design. 1T57 of very light displacement. Posted by: Tanton - website: http://tantonyachtdesign.blogspot.com

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Nice. How does it protect the green house from mast movement?

Thank you Rurudyne. My rendering did not address the engineering aspect of the design. only the visual.

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Van De Stadt Black Soo 31'

• Thread starter christmas
• Start date 9 Aug 2006

Van De Stadt Black Soo 31\' After advice on this type of boat??? She is Marine ply deck and hull does this cause concerns??? Most I see of plywood are sheated??? Should I be looking for anything in particular with plywood hulls and if purchased should I spend the money sheathing her??? How much would that cost??? Built in 1961 by Richard Betts if that means anything to anyone. Thanks in anticipation...  

Re: Van De Stadt Black Soo 31\' G'day Christmas, Ply boats are very easy to repair and cost less than GRP to repair, fresh water leaking inside is your enemy, rain water is the main contributor. There are many old ply boats still around, some from the second world war that were built in a hurry are still afloat. Proper treatment with epoxy eliminates the need for sheathing, thou I prefer a ply boat to be sheathed myself. This is also a simple project, just apply a coat of resin and stretch the sheathing to eliminate creases and roll on a little more resin. Check what the hull has been treated with, most were sheathed early in their life, the sheathing material is very thin and may be obvious. Check for wood rot with an old dart (Flight not required) holding in your fingers push the point side on to the area being checked and see if you have a mark, test the pressure required on a known good lump. Any areas of end grain such as chines and the bow or transom to hull are the areas to check first. Van De Stadt designed some very nice looking and very sea worthy boats with good performance in their time, so enjoy. Andavagoodweekend......  

Re: Van De Stadt Black Soo 31\' I don't know this particular boat but have had the experience of restoring a ply boat. If you find any rot, the chances are that it will have spread into adjacent hidden places. As oldsaltoz says, it is fresh water that is the enemy of wooden boats and they usually rot from the inside out. Condensation and rainwater leaks are the usual source (assuming the boat normally floats in salt water). You need to look for any places where water can sit, such as on top of the chine logs or on top of any stringers that haven't been provided with a drain hole. Check for blocked drainage holes between bilge compartments. Have a good sniff around inside the furthest reaches and lockers for the smell of dry rot. It has a very distinctive odour. Be careful when prodding round with a sharp object. A seller must expect a surveyor to do that, but several prospective buyers can make a lot of holes! I hope she is sound- if so, when she is totally dry inside, it is worth giving the bilges a good soaking in wood preservative such as Cuprinol. I had my boat resheathed and went well over budget in the process, and with hindsight it probably wasn't necessary.  

fishermantwo

Active member.

Re: Van De Stadt Black Soo 31\' There are a lot of Black Soo's in Australia, very popular in the '60's. Fast, wet and with the Van De Stad pedigree how could you go wrong. With the recent increase in interest rates here a dead yacht market is going to get worse so there are going to be some excellent buys about. The plywood available in the 60's was very good quality {my yacht has a cedar ply hull}. As Oldsalt has said, fresh water is the problem. It lays in the hull, evaporates and condenses on the deck and under the cockpit. Check carefully under the cockit, this seems to be the worse place for rot.  

• 10 Aug 2006

Re: Van De Stadt Black Soo 31\' Thanks to all for the info much appreciated, What is a Chine??? One Day I'll find a boat!!!  

Re: Van De Stadt Black Soo 31\' [ QUOTE ] Thanks to all for the info much appreciated, What is a Chine??? [/ QUOTE ] Boats constructed of sheet material like ply or steel often have chines, they the change in angle from one sheet to the next, most noticeable at the bow, where the sides are rounded to form the pointy end, then a change of angle that continues under the boat to form the underside of the hull. Chine - The angle of intersection between the topsides and the bottom of a boat. In a hard-chined boat this angle is pronounced. See http://www.marinewaypoints.com/learn/glossary/glossary.shtml#C Andavagoodweekend......  

Re: Van De Stadt Black Soo 31\' I patched up a ply chine boat for a friend ( YM Senior - about 16' ). Repairing bits in the middle of a panel is a comparative doodle. Inevitably, however, water had settled along the chine stringers and that's where the rot was which meant much more serious surgery. If twere me I'd have a really good suspicious look and don't be optimistic.  

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Home > Find Your Sail > Search by Make and Model > Black > Black Soo 30

Black Soo 30

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• Sailboat Guide

1968 Van DeStadt Black Soo

• Description

Seller's Description

31FT Van DeStatd Black Soo 1968.

ULDB “Starbuck” 27.5 LWL 4500 lbs. Symmetrical and asymmetrical spinnakers. ATN spin sock. New Tohatsu 3.5. X5 and St2000 autopilots. Plotter w/AIS. E-rudder. Solar, lithium battery. Double axle trailer.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Derived from the earlier ZEESLANG of the mid 1950’s and from a number of different builders around the world.

This listing is presented by SailingAnarchy.com . Visit their website for more information or to contact the seller.

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