Richard L.

My Feedback: (24)

For a normally aspirated 4-stroke such as a Saito or an OS, my general rule of thumb is one pound of weight per 0.1 cubic inch of engine displacement. So a 6.5 lb plane would require a 0.65, a 9 lb plane would require a .91, a 12 lb plane would require a 120 four stroke and so forth. Sorry, I don't fly 2-stroke.