Hi,

Since the RCS 180 has the same power as the older 3W-24 (I tested them), I would think the newer 3W-28 would be the most powerful 30 cc engine. Hp increase is 0.5 over the 24.

I have had really good luck with the 3W-24 and the 3W-28 is the same engine, just bored out a little. I would go with that engine and Gerhard at Aircraft International

Elson