> Has anyone had any experience with translating single plans into
> plans for a double? I am thinking that scaling would be a safe way
> to do it, 10-20% bigger with everything. But I'm not sure how much
> is too much or too little. I am not sure if the boat would perform
> the same with the larger size. How would increasing the dimensions(length
> and width) by 20% affect the volume or displacement?

> I am curious to hear what you all might have to say.

> Thanks, Chad

When I designed my double, I took the lines of my single and virtually "cut it in half". I'd decided what beam and length I wanted and simply extended the curves of the bottom planks to achieve the required dimensions. The cockpits were moved closer to the ends to keep them apart and stop paddle clash. I'd also run off a list of doubles that most nearly met the dimensions I was designing to also help check my ideas.

I have been very pleased with the results. However I did start with a good design and did design within certain parameters i.e. for light, female, front paddlers (lighter and prettier than me). Probably the former dimension was of greater importance to the kayak's performance than the later.

Alex