Blue I have my 35 in a Great Planes Super chipmunk that is an 81 inch wingspan and is in the 15 and a half pound range. And it has all the verticle that i could ever want. I am turning a APC 18x8wide blade and the engine has no issues. I don't fly it but 4 or 5 days out of the year but when I take it out it starts easy everytime. One of my better running engines. You will not be dissappointed.