Well im not exactly sure what the altitude is but im guessing around sea level. I also fly on a smooth runway and im not saying it wont fly (which it does very well) its just it could use some more power. It cant perform loops or rolls unless put into a steep dive.
I have been using skis which again causing alot of extra drag which is another reason why i would want to go with a larger engine. Although i did try to do some maneauvers with wheels and it wouldn't go.
Again im not discouraging anyone from this engine (for the money its not bad for the occaisonal flyer) i just feel that there are better engines out there for just a little more.

Papa