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Are you sure you want to reduce the width that much? 5% of 21" is about 20"--have the ladies paddled boats that narrow? Of course, if they're shorter, making their CG lower than burly, top-heavy guys, they might be comfortable with 20" beam. Will you use the boats for camping, or just day-tripping? If you use them for camping, I'd be reluctant to sacrifice any more gear-carrying volume.
As for reducing length, you could either scale them as described in the back of Nick's book, or just do a linear scaling (reducing form spacing to 10.75" will get you pretty close to 10% shorter).
As for reducing form size, just plot the forms full-sized and then either scale them while still in CAD or a with a good copier set at 0.95.
Shawn
> Following the sizing thread .... a number of us here are planning to
> "production line" 4 Guillemots -- two of which will be for small
> females. Does anybody have any guidelines for making them *smaller*. We
> had thought of reducing length by 10% and width/height by 5%.
> - bruce
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Guillemot Kayak - High
Performance Wooden Sea Kayak Designs
