That does it! Since we've been talking about 2 and 4 stroke engines and even throwing in Jetex and such, I feel we have neglected rockets (OK, solid AND liquid) and turbines as power plants. So they don't swing a 12 x 4 prop very well... So what! Talk about easy to adjust? - A solid fuel rocket gets lit and off it goes! Talk about fuel guzzling? - A liquid fuel rocket can drain a tank faster that you can fill it! Talk about complicated? - A turbine can make a grown man cry!

The preceding has nothing to do with the original question, but it seems to fit some of the logic pro and con each engine type. They're as good or bad as you feel about them and both 2 and 4 strokers give excellent results, now go junk all the 2's and get a REAL engine...

quint