kirby 25 sailboat data

The Kirby 25 is a 25.17ft fractional sloop designed by Bruce Kirby and built in fiberglass by Mirage Yachts Ltd (CAN) between 1978 and 1982.

223 units have been built..

The Kirby 25 is a light sailboat which is a high performer. It is stable / stiff and has a low righting capability if capsized. It is best suited as a racing boat.

Kirby 25 for sale elsewhere on the web:

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Kirby 25 - Sailboat Data, Parts & Rigging

Sailboat data, rig dimensions and recommended sail areas for Kirby 25 sailboat. Tech info about rigging, halyards, sheets, mainsail covers and more.

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Fin w/spade rudder

Specifications KIRBY 25

Home - Sailboat Listings 1978 - 25.17 ft / 7.67 m - Bruce Kirby - Mirage Yachts Ltd. (CAN)

KIRBY 25 Sailboat Data

Hull Type: Fin w/spade rudder Rigging Type: Fractional Sloop LOA: 25.17 ft / 7.67 m LWL: 20.75 ft / 6.32 m S.A. (reported): 289.00 ft² / 26.85 m² Beam: 8.75 ft / 2.67 m Displacement: 3,150.00 lb / 1,429 kg Ballast: 1,150.00 lb / 522 kg Max Draft: 4.17 ft / 1.27 m Construction: FG First Built: 1978 Last Built: 1982 # Built: 223 Builder: Mirage Yachts Ltd. (CAN) Designer: Bruce Kirby

Information from  sailboatdata.com .

Hull Speed: 6.10 kn

Review of Kirby 25

Basic specs..

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

The Kirby 25 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

The boat can enter even shallow marinas as the draft is just about 1.28 - 1.38 meter (4.20 - 4.50 ft) dependent on the load. See immersion rate below.

The boat is typically equipped with an inboard engine

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 Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.1 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 Kirby 25 is about 115 kg/cm, alternatively 647 lbs/inch. Meaning: if you load 115 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 647 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 L/B (Length Beam Ratio)?

What is a Ballast 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 19m 2 (204 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

Are your sails worn out? You might find your next sail here: Sails for Sale

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 Kirby 25 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.

KIRBY 25 Detailed Review

If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of KIRBY 25. Built by Mirage Yachts Ltd (CAN) and designed by Bruce Kirby, the boat was first built in 1978. It has a hull type of Fin w/spade rudder and LOA is 7.67. Its sail area/displacement ratio 21.57. Its auxiliary power tank, manufactured by undefined, runs on undefined.

KIRBY 25 has retained its value as a result of superior building, a solid reputation, and a devoted owner base. Read on to find out more about KIRBY 25 and decide if it is a fit for your boating needs.

Boat Information

Boat specifications, sail boat calculation, rig and sail specs, contributions, who designed the kirby 25.

KIRBY 25 was designed by Bruce Kirby.

Who builds KIRBY 25?

KIRBY 25 is built by Mirage Yachts Ltd (CAN).

When was KIRBY 25 first built?

KIRBY 25 was first built in 1978.

How long is KIRBY 25?

KIRBY 25 is 6.32 m in length.

What is mast height on KIRBY 25?

KIRBY 25 has a mast height of 9.22 m.

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• Sailboat Guide

1980 Kirby 25

• Description

Seller's Description

Kirby 25 by Mirage Yachts. Bruce Kirby is the famous designer of this and many other successful classes, including the world famous Laser. The Kirby 25 mostly resembles the J-24 and has a similar handicap for racing purposes.

This boat has every possible adjustment. Lines are fresh/new. There is a jib (2 jib halyards for sail changes), a genoa, a main and spinnaker…all good quality. Jib and spinn bought in 2020. Every line needed for the spinnaker is neatly stowed down below. Spinnaker pole on deck as shown. 5 hp Mercury. Runs as it should.

This is a perfect boat for Wednesday night racing on Lake Norman. Ready to go.

No trailer. Boat title in hand.

Outboard motor starts easily and runs smoothly. Extended shift lever makes it easy to access from the cockpit.

Boat generously donated to Lake Norman Community Sailing, a 501(c)3 non-profit. Boat proceeds will be used to offset operating expenses at the sailing center. Call. Leave message if no answer.

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)

Thanks to Chuck Lanning for providing additional information and corrections.

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

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Kirby 25 (Q30593637)

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JeffH, et al.: Kirby 25

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A friend has asked me to look at a Kirby 25, presumably so we can race it, since he sold the frac rig Jeanneau 39. Don''t know year. Basically, I think it''s just a hull and a mast. Any Kirby info resources (I found the spec. brochure online)? We''re talking nearly free, with trailer. The boat will be done up for (fun - limited veins-in-teeth) racing between Puerto Rico, St. Thomas and St. Maarten. Right now I''m refitting the old Bristol 35 for ma and pa dinking around - including new standing, running, through hulls, instruments, plumbing, refrig., awlgrip, barrier, etc., etc., so I know what I''m up against with helping set up the Kirby. I also understand that there''s a hull/deck joint to be wary of with the Kirby. Also a question of some sort at the masthead with regards to stay kinks. The boat was originally owned by Per Dohm of "Water Taxi" fame in the USVI. Per''s retired now and they moved the boat from Red Hook and have decided to get rid of it. It''s been on hard for at least the past 10 years. Tell me about the Kirby 25. Tell me what''s to be done to make this enough of a sled to make it competitive. I spend more time in the yard than on the water - I might ***** about it, but it''s addictive until I reach overdose, then it''s months before I go back. I can do the glass & rigging, so that''s not a huge concern, and can tell when to walk away, but the project might be fun with my kids'' help. Give me guidance on the K25. History. Contacts. We''d be going full bore to bring it back from the ashes, including a new suit and a slippery bottom. Thanks for any input. KW  

I own a Kirby 30 (slightly younger and 5'' longer). There is a discussion forum for Kirby 25''s at http://www.stcatharinescc.com/forumkirby/list.asp?fid=20 Same problems apply to both boats: - wet decks - they used balsa as coring - deck to hull - this is a light weight racing boat so you will probably need to remove the screws joining hull to deck and rebed, along with all the hardware - mast - most seem to be replaced on both K25/30 - they use running backstays which some people don''t know how to use Other than that, they are fast boats. My experience on the K30 shows they are like the Laser - keep them flat, shorten sail (headsail or main) early or they round up / broach quite easily. Cheers John  

Thanks John. We''ve got the boat and trailer for $1000, without boom. Mast extrusion looks o.k. I guess I''ll keep after the message board that addresses the Kirby 25''s for further info. Thanks again.  

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