Goshawk--A Racing Dinghy or Tender


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  • Pub No.: 5849
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Designed by Charles G. MacGregor

LOA 11 ft. 6 in., Beam 4 ft. 6 in., Draft, c.b., 3 ft. 1 in., Sail Area 72 sq. ft.

This boat is within the dimensions of the class B Dinghies, but is not eligible to race in this class because of the plank thickness and hull weight, and for this reason we doubt if she will perform quite as well on the wind. But for group class racing they will provide excellent sport. For those who are going to build Goshawk the following hints will be helpful. No doubt there are other ways and methods which will be preferred or suggested by your own previous experience. Do not change the design or construction. It is based on considerable experience. If you don't like either, don't build this boat, but have one especially designed to suit your own ideas. It will be noticed on examination of the plans that the bottom is a combination of vee and arc form. In thin plywood of large panel sizes it is possible to obtain a slight compound curve, and when this is done to the bottom plank in this case, it prevents panting between supporting members, and helps to eliminate the wavy or rippling effect which sometimes develops on the planking. The amount of curve is 1/2 inch in 2 feet. Make a mould to this curve and use it on all frames. On all watertight seams and contact surfaces we recommend the use of waterproof glue and screw-fastenings. It is absolutely necessary to make proper contact between the surfaces being bonded, and the fastenings must be spaced close enough along the edges to provide the pressure necessary to squeeze out the air pockets and channels in the glue which become water channels when the boat is launched and the seams are submerged. The transom is raked slightly so that a small outboard engine can be installed easily. The stem is wide at the head tapering down to a point at the forefoot. This has three points in its favor: (a) Provides more width forward around the mast; (b) Easier to plank because the plywood does not have to be twisted so much as it would have to be with a straight stem, and (c) it permits the addition of more flare forward to ensure dryness and buoyancy when pitching into a headsea.

8 pages, 2 plate(s)


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