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Specifications for the Yankee One Design

Revised to May 1st, 1947

Length overall, about 30′ 6″

Beam 6′ 6″

Length design waterline, about 24′

Draft design 4′ 6″

Sail Area 312 sq. ft.

Lead Keel: 2550 lbs

Displacement: 4,775 lbs

PLANKING: Single Philippine and Honduras mahogany, finished 3/4″ thick.

FASTENINGS: Bronze throughout.

FRAMES: Oak 1″ x 1″ spaced on 8″ centers. Not tapered. Frames to be fastened to floor timbers with three 1/4″ dia. bolts set up with nuts on washers in each frame.

DECK BEAMS: Of oak 1″ x 7/8″ on every frame.

CLAMPS: Oregon pine.

KEELSON: Mahogany, oak or suitable hardwood.

STEM: Mahogany, oak or suitable hardwood.

FLOOR TIMBERS: Of oak 1″ thick. Three times diameter of keel bolts in way of keel bolts.

DECKS: Pine or fir T and G, not less than 5/8″ thick, or 1/2″ Weldwood plywood. Decks to be covered with 6 oz. canvas laid in paint or glue.

TRIM: Cockpit coaming and trunk cabin sides, hatch and slides, covering board and toe rail of mahogany, butternut or teak.

TRANSOM: Single or triple ply, 3/4″ thickness. Single ply of oak, mahogany or philippine. Triple plied with outer skin of mahogany or philippine.


KEEL: To be of lead. All keels must be cast from a mold approved by the Association, and must be weighed by a designated official and have weight in lbs. stamped on starboard side at section No. 5, near top of keel, in letters not less than 3/4″ high. Keels shall not weigh less than 2525 lbs. or more than 2550 lbs. before pockets for bolts heads are filled.

RUDDER: Rudder blade of Honduras or African mahogany, oak or teak. Rudder post 1 1/8″ diam. solid bronze. Pintles and tiller fittings to be standard pattern.

BULKHEADS: Two watertight bulkheads of 3/8″

Weldwood plywood (or equal), one forward, one aft.

SPARS: Of Sitka spruce. Masts to weigh not less than 75 lbs. bare, and balancing (bare) not less than 40% of length from heel. Top of mast shall not be over 35′ 8″ from deck. Center pins of sheave shall be 5″ from top of boom nearer than 2′ 2 1/2″ to deck from mast. Boom shall be 13′ 6″ long measured from after side of mast to end of boom.

SAILS: Area approximately 312 square feet. All sails, including spinnaker, to be cut according to plans of the Yankee One-Design Association dated March 11, 1940.

Mainsails to have wire luff rope. The hoist of the mainsail at no time to exceed 33′ 2 1/2″. Mainsail not to extend beyond the outer end of the boom. Mainsail not to have more than four battens, the top and bottom not to exceed 24″, — and the two middle ones not to exceed 30″. Mainsail and Working Jib must be made of canvas no lighter than 5 oz. If made of nylon, 5.3 oz. for Mainsail and Working Jib, and 3.7 oz. for Genoa Jib. Spinnaker made of 1.77 oz. duck or 1.2 oz. nylon.

DISPLACEMENT: Yankee One-Design boat displacement is 4,775 lbs.

The limited overhang of the bow is key to the YOD’s success as a light displacement boat designed for rough water.

“The plans show very clearly why she is a fast boat. Note the long, easy diagonals.”

- W.S. Burgess

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