G'Day Paul,
I have a little old Hamilton Colorado Junior jet unit in a 16'
"Lewis" hull. I've been puzzling over whether or not a P port
rotary would have enough torque at low revs to spin it, if so
how about a single rotor, as it's only meant to absorb 100 hp.
All the published torque curves I've seen seem to show little
torque below 3000 rpm.

I have enough 13B parts to experiment in a boat before I try to
fly on one. It would be an ideal test-bed to play with ignitions
and carburettors. I flew for many years on a VW using an
outboard motor fly-wheel alternator to charge the battery. I
didn't try to use the outboard ignition. I think it was a
Mercury.

John Evans
                       
If it is a jet boat it has a high RPM pump I think.
16 feet ought to handle the weight of a two rotor. 250 HP would
really get it going :)

Paul Lamar