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Kayak and Canoe Design Bulletin Board
Reading Plans
Posted By: Steve A.
Date: Wednesday, 1 March 2000, at 10:12 p.m.
Hi, I am hoping to build a pair of cedar stip kayaks and have been reading Ted Moores book Kayak Craft. This book includes plans given as a series of coordinates for each station. Having studied the numbers I can make sense of everything and get a reasonable looking shape for the hull but when I try to draw the deck I run into a problem. The numbers given for the height of the sheer and the height of the profile on the deck don't make any sense at all unless I reverse them, applying the profile height at the sheer and the sheer height at the profile. Things then look pretty good (the buttock heights look okay as presented) except the sheer taken from the deck height table (using the profile number) falls 1/4" below the sheer taken from the hull height table. So I have two questions:
1)Is there an explanation for the reversing of the sheer and profile numbers in the deck height tables?
2)Why don't the sheer heights - hull and deck - correspond? (It did occur to be that the difference might result form the thickness of the skin but if that were the reason I would expect the deck to register 1/4" above the hull, not 1/4" below)
One last note: Since I don't know how to read these plans I established my reference lines by assuming the sheer of the hull to be a common point in the breadth and height tables for a given station and working backwards to get the reference lines. It appears the horizontal reference lies above the kayak as it sits in a natural, upright position. Is this usual?
Any comments about this book and the plans it contains would also be appreciated.
Thanks.
SAnderson
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