surgarfoot

I agree with chooseing the larger of the engines that are suggested ,

especially if you live at altitude,IE 500 ft and above sea level, I for instance live at 4300 ft elevation, a plane that will fly on a 40 size engine at sea level will require a 61 or larger to fly here with the same performance, we fly 91's on the 60 size ultra sticks just as an example .this is from our field , if we fly from another that is 30 minutes from here and another 2000 ft high the 91 will fly them but they do not perform the same .

Highlander