Kayak and Canoe Design Bulletin Board

Re: stretch single to double

Posted By: Nick Schade
Date: Monday, 8 February 1999, at 11:26 a.m.

In Response To: Re: stretch single to double (Randy Knauff)

George and Mike are correct, a linear scaling of the whole boat creates a linear proportional increase in volume. YOu can do as Mike suggests and repeat the center or your can increase the spacing of the central forms more than the end forms. You need to transition gradually between the different spacing to make the lines stay fair. For example increase the spacing of the center forms by 8" and as you go towards the ends reduce the spacing by 1". So the center forms are at 20", the next at 19", 18", 17" etc.

This increase the volume where it makes the most difference while still maintaining a reasonable shape.

> George, I was thinking to get more than 33% increase in load since the
> wider sections in the middle part of the boast get correspondingly larger
> by extension than the narrower end portions and there are more of them. My
> rough calculations indicate about the same bottom surface/wetted area (and
> displacement?) for the 24' x 24" boat as my 20' x 29" commercial
> double. Does that make sense or am I missing something? I am new to
> building and changing designs so any input is appreciated.

> Randy

Messages In This Thread

Re: stretch single to double
Randy Knauff -- Sunday, 7 February 1999, at 6:04 p.m.

Re: stretch single to double
Mike Scarborough -- Sunday, 7 February 1999, at 7:05 p.m.

Re: stretch single to double
Randy Knauff -- Monday, 8 February 1999, at 10:31 p.m.

Re: stretch single to double
Nick Schade -- Monday, 8 February 1999, at 11:26 a.m.

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