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14' Nuthatch Pram Plans - Sailing Version PDF

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Description

The 14ft Nuthatch Pram (sailing version)

Thank you for choosing to build the 14 foot Nuthatch Pram. After designing and building the 8ft Nuthatch Pram and designing the 12ft Nuthatch Pram, I thought that a larger version of the hull would be a good fit in my series of stitch and glue boats. This is the finished design of the14ft "sailing"version.

The main change in the 10ft, 12ft, and this larger 14ft version of the Nuthatch Pram from the original 8ft hull, is the use of a curved arc along the bottom edge of the two side panels. On the 8ft hull, the bottom edge to the two side panels is a straight line. This was used to help in the lofting and construction process. The straight edge on the 8ft hull, also kept more hull below the waterline near the stern in this shorter version. Which in turn increased it's load carrying capacity, and increased it's stability. The larger hulls, from 10ft and up, have extra width and length to offset the need to keep the straight line on the chine seam. Plus the curve added to this and the other larger hulls, just makes the designs look better; with the smooth flowing (not quite parallel) curves of the chine and shear lines of the side panels. The curve in the side panels at the stern, also picks and lifts up the aft outside ends of the two bottom panels, and reduces the whetted area to improve rowing (if you do on this longer hull) when solo in the boat.

The drawings for this "sailing version" have some changes from what I usually show in my designs. Since this is a larger sailing hull, and not knowing what type/kind of sail(s) you might use; I have changed the length of the Daggerboard Trunk to let you experiment with the placement of your DB. Keep in mind that if you make changes to the sails; you/sail maker will have to determine the location of "that sail(s)" CE (center of effort) and match it up to the CLR (center of lateral resistance) of the hull. The drawings show how to do this and the longer DB truck will let you "tweak" the position of the DB in the hull. You will want a slight weather-helm for control of the hull in most wind conditions.

I have gone to using the "enclosed pyramid" (with watertight hatches) style of seating in all my designs for safety reasons. After reading a story with photos, dealing with the deep water self rescue of a brand new "traditional open interior" small boat design, and they couldn't empty out the water; I will no longer include drawings or instructions for old style wooden plank seat interiors. Your safety, and that of your family members is more important to me, than any negative comments about my hull interiors. This hull as designed, has around 10+ cubic feet of extra positive flotation build into the enclosed pyramid seating. That's over 600 pounds of extra support, along with the wood in the hull; and you will have less water to bail out. The two handles or steps on the stern are there to help you or a loved one, get back in the boat again if needed. Always carry and wear, a life jacket adequately sized for you and your guests, and be sure they are in good condition at all times.

I have not built a prototype hull to test the lofting, but after tank testing the previously built 10ft Nuthatch Pram, and comparing that with it's launch photos; the 10ft Nuthatch Pram sat better than I though it would, and so this 14ft version should too. I kept adding "people" to the 14ft model and it hardly moved. I have also found that there are very few "tweaks" that I have had to make to any prototype design while building. They have been in the 1/16" +/- range at a couple points during the lofting and curve smoothing stage, and usually dealing with the curved "arc lengths" between the mating edges of the side and bottom panels. I would expect no major problems for you during the construction of this boat.

study plans

Thank you again.

Warren D. Messer

Red Barn Boats

SPECIFICATIONS:

LOA: 14' 5"

LWL: 11' 4”

Beam: 66"

Weight: Depending on the wood used!

Okoume: 220-250lb

Meranti/Keruing 250-360lbs

Maximum Outboard: 10hp

The U.S.C.G. Calculations allow for a larger OB, but for a sailing hull 10hp is enough.

A "long shaft" motor is also needed because of the depth of the transom panel!

Maximum Load: 850lbs

Maximum Persons: 4 at 190lbs Each

Free PDF Model to print, cut and build - click HERE

Free Study Plan package - click HERE

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Additional Information

Measurements:
Imperial
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