ORIGINAL: BasinBum
It's such an apples and oranges discussion anyway. Does anyone decide going gas or nitro based on weight once you are into the 80"+ wingspan aerobats? You could put the BME on a 78" plane but why would you? The extra cost for the larger planes that are really what this engine is for is minimal.
I was thinking 72" to 78" -- about 11 to 13 pounds. I know power is over the top, but this motor weighs less than any other 40cc I know of.
Why go with a 50cc plane when for just a little bit more you can put together a 80cc plane?