Re: Folding prop help
I doubt if you're underpowered. How fast (RPMs) can you get the engine going in gear? You want to be running at a higher RPM to get up the torque curve.
The Atomic 4 was the most common engine in C&C30s until about 1979-1980 when they stopped production. The A4, although rated at 30 hp, would max out at about 2200 rpm with most props, and was only generating about 12-15 hp at that speed, but that is plenty of power.
If you're not going to race, you don't need a folder. As Rob said above, a 3 blade would be the way I'd go if I didn't race.
1977 C&C 30 Mk 1 hailing from Port Clinton, Ohio