Small Boat Design

Discussions around designing small boats including kayaks and canoes.

Seat Position?

Couple weekends ago, I finished fiberglassing the hull on my narrow, heavy modified stitch and glue kayak Tonight; I had in the water without the seat and a deck. The purpose was; I wanted to try it out badly and also checking for the proper fore/aft seating position.

Having the hull sitting empty in the water, I measured the bow and stern height from the dock. They were both the same. Next, I placed my self in the seat at the supposed location and had my friend measuring again the bow/stern. This time, it was 7/8” higher in the bow then in the stern. I had a GPS with me to check if shifting the weight makes any difference. Sadly, the GPS is not that accurate enough to show small changes as it is jumping around. I measured 11.3 km in a sprint, guessing, I should be able to do 10 km for an hour. 10 km will be the design speed.

In Nick Shade’s book, the center of mass (CM) should line up with the center of buoyancy of the boat (CB). Should I move the seat forwards till the bow and stern are the same height again when I’m sitting in there? Any other ideas on how to find the proper seat position? Otherwise the kayak travels straight, very little wake according what my friend observed from the rear.I coulnd't check for anything else, I have only 2" freeboard.

Thanks for any help. Roland

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Seat Position?
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