What do you need the boat to do?
- carry X lbs. of people and stuff
- be stable enough to tolerate a hyperactive lab?
- be a faster rowing boat
- etc.

Stretching the boat in length only will increase the carrying capacity 16%
and improve it as a rowing boat in all but the windiest conditions.
At about 4', it's already wide enough to provide decent spread between the
rowlocks without outriggers.
If you need more than a 16% increase in displavement, i'd look at other
designs rather than widening the boat.

Regardng construction, the scantlings in the book look OK to me for a
stretch version, except that i'd make the breasthook and quarter knees of
3/4" or 1" solid stock and perhaps enlarge them a bit. Just adjust the
spacing between the station molds. If that pushes the spacing past about
18", 1/4" strips might be a bit wayward and you might make 'em a touch
(1/32") thicker.


"Jay" wrote in message
...
I asked this group before about extending a cosine wherry and got some
good responses. But I don't remember any comments regarding the beam
on it. I think I finally decided (but am still not 100% sure) that I
would like to make it 16' 3" instead of the original 14' design. With
the additional 2 feet plus should I also consider increasing the beam
proportionately?

Thanks,

Jay