Vince,

Please look a few posts up. The guy you seek has posted here, in this thread. Did RCU lose the thread for you?

OS has just released their 40cc 4 stroke gassie. A few guys bought it from Tower and we should start hearing how it does in sport fliers hands. It's heavy at 1200 grams (engine only) and according to the specs develops only moderate power, less than the 33 2 stroke I use. SO I'm not going to jump on it any time soon.

My OS33 has gobs ofmid rangetorque, the best I've seen out of any 2 stroke in the 30-40cc class. Frankly, it's hard to determine exactly how it can do that and still use miniscule amounts of gasoline.......... About the only thing the 33 doesn't have compared to the YS175 is the great downline brakes YS's have. Sure, It is a little faster downhill but very manageable. I don't really feel rushed in the vertical down 4 point for example, or the figure 6 w/1/2 roll. I also realize that sincevery fewother than myclub mateshave seen my combination fly, it's hard for folks to get it from words alone..........So far, the 33 has delivered everything I've asked it to. I think enough of this powerplant to own several.

A really well thought out design of 40ccshould be a little better based on displacement.But do we really need to turn a 22" or 23" prop in Pattern? It would be great if it turned a 19x12 or 20x10 3 blader tho.