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2014 Oughtred Grey Seal custom build

Listed
Expired
$18,500 USD

Seller's Description

2014 Custom Oughtred Gray Seal Custom wood boat with classic lines, and class. 2019 Yanmar 9GM diesel engine and 2014 tandem trailer.Must see to believe.

Engine The boat is powered by a Yanmar 9 hp 9GM diesel engine, which was installed new in 2019. Estimated 20 hours on engine.

Design features About the design: The boat is built to the design of Iain Oughtred, a well known designer of wooden boats. Iain is Australian, but lives in the Pharo Islands now. IThe plan was first published in the early 1990’s, by , and called “Grey Seal.” Oughtred is known for designing traditional small sailboats and rowing boats based on the Swedish Folkboat. They are typically canoe hulls with external tiller rudder, and lapstrake planking. He specializes in designs which can be constructed using epoxy-joined marine plywood. Grey Seal is, I believe, his largest or second largest design. Several dozen have been built around the world by skilled amateurs and professional wood boat builders. The Grey Seal is NOT a racing boat design, although it moves very nicely even in light breeze. It is primarily designed for weekending, or day sailing, although some hearty souls have used them for extended sailing in open ocean. I have never had her in open water. My wife and I have sailed exclusively on the Delaware River and Barnegat Bay.

I followed the design precisely, as well as his material recommendations and construction techniques. Where Iain was unclear, I either contacted him directly for help, or else got advice from professional wooden boat builders and designers. My primary source was John Brady, master wooden boat builder and designer, now retired, who was at the time, the director of the Workshop on the Water, a full service wooden boat construction and restoration shop at the Independence Seaport Museum in Philadelphia for many years. John went on to become the President of the Museum before retiring. As I mentioned, I was a volunteer boat builder there for about 13 years after I retired, and John was my mentor for much of that time.

Equipment: Materials

The hull, cabin, and deck are constructed using 12mm mahogany marine plywood. This includes the strakes in the lapstrake hull, each of which is cut to plan from sheets of plywood. Where required, a standard 6 inch long scarph joint is used to join boards. All surfaces are coated,after fabrication, ,with 2 coats of West System epoxy to fully waterproof the material. All plywood, including the strakes, are fastened entirely with thickened West System epoxy. Six inch scarph joints are used wherever it is necessary to join boards.

Structural members (frames, deck beams, cabin roof beams) are made of ash. Where practical, frames and beams were steam bent. These, too, were epoxy coated after being put in place, and the plywood sheathing was epoxied in place with thickened epoxy.

The exterior keel and deadwood was cut from clear Douglas Fir. The rudder, cleats, mast step, rails, are all made of white oak. Moulding, visible trim and cockpit benches are either Honduras or African mahogany. The engine bearers are larch.

The mast, boom, and gaff are all constructed from clear Sitka Spruce. Gaff jaws are white oak. The mast hoops are made of white oak, steam bent and fastened with copper rivets in the traditional manner.

All metal fittings are fabricated from silicon bronze, including the drifts holding the rudder together, and the keel bolts. The cast hardware (gooseneck, pintel and gudgeon sets) were fabricated by a British foundry to Ian Oughtred’s specs. I fabricated the other hardware (drifts, bolts, chain plates.) The mast hinge is galvanized steel, fabricated at the Workshop on the Water.

Specs

Designers
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Builders
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Associations
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# Built
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Hull
Monohull
Keel
?
Rudder
?
Construction
?

Dimensions

Length Overall
22 0 / 6.7 m
Waterline Length
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Beam
6 11 / 2.1 m
Draft
2 0 / 0.6 m
Displacement
?
Ballast
?

Rig and Sails

Type
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Reported Sail Area
?
Total Sail Area
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Mainsail
Sail Area
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P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
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Model
?
HP
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Fuel Type
?
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
?

Hull Speed

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.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

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

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Classic formula: ?
Sail Area/Displacement
?

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.

Formula

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.
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<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
?

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.

Formula

Ballast / Displacement * 100

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<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
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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.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
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<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
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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.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
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<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
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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.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
?
<2: better suited for ocean passages
>2: better suited for coastal cruising

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