OS .46LA put it through the ringer and it never gives up! Not a powerhouse but if you dont want deadstick landings and reliable easy starting, tuning, get it.

Rossi .45, .53 If you want power look no place else. My only gripe is tuning, some engines are just plain finicky but oh my god what a great powerhouse

Evolution .60 Decided to try it, having trouble getting the low end right, still hesitates a bit when throtling up, any suggestions would be appreciated.

HP Gold cup .40 For weight to thrust ratio, this engine has been unbelievable and if you are looking for the lighest engine with the most power look no further.

HP Gold cup .60 Good engine but not as powerful as the .40 when comparing thrust to weight.