In the Northeast division (D1), most of the guys are flying OS 160 two strokes on their full 2M planes. Those of us with smaller planes have the 120AX. For four stroke, YS 170DZ on full 2M planes, and YS 110FZ on smaller planes. Then there's electric...

I've got the Venus II with 120AX. Nice intro plane, but you can get nicer planes if you want. The engine is powerhouse for 90-120 size planes. Has lots of low end grunt for a two stroke, but not like a YS 110.

OS FSa110 is not enough power and is heavy. I haven't seen anyone use the 140 yet; seems like a waste of $$$ when the 160 is dominating the scene.

YS engines have a built in pump/pressurized system. Those of us with OS two strokes are using the Perry VP30 regulator.

It really comes down to those 4 engines, at least around here (2 stroke: OS 120, 160; 4 stroke: YS 110, 170). If you are up to getting a YS, I'd say that's the way to go. More stuff to deal with and required high nitro AND high oil fuel (20/20 or 30/20) but the power and sound is unbelievable. OS is easy; 15%, fuel up and fly.