Originally Posted by
egrave1
the manufacture Recommended a 1.20 which is 3.5hp a 20cc is only 2.5hp and a 30cc is 3.7hp so if I went to a 30cc gas engine to match the 1.20 why would there be a problem loading a 66" wing
Depends what type of airframe it is. I have a PTE36cc on an Aeroworks Yak with a 72" wing and it flies great with no bad habits albeit a bit overpowered. Specs gave a range of 20-30cc for power and 9-10 pounds weight.