On Thu, 20 Aug 2009 20:21:25 -0700 (PDT), Robin
wrote:

I had a brainwave the other day about putting a small (300cc)
aircooled two stroke as an inboard in a small wooden boat. With
adequate air circulation can anyone see any potential issues here? I
would build the boat with this purpose in mind so adapting something
to fit would not be a problem.

Robin
Why not?

I assume that you are not talking about a motorcycle engine as if so
you will been to build some sort of fan cooling arrangement.

If you direct drive the propeller you may have a problem with too high
propeller rpm, depending on what sort of engine you are using. In
addition you will have no reverse and again, if it is direct drive, no
neutral.

Depending on your engine and its speed you might want to consider some
form of belt drive which with a little forethought could furnish you
with gear reduction, a reverse and a neutral.
Cheers,

Bruce
(bruceinbangkokatgmaildotcom)