It is amusing to read about how some people charachterize the level of complexity, flying model airplanes upon engine displacement.

I have a friend who is quite comfortable flying an airplane with a 4000 cc engine but he can only with some difficulties land his 6,5 cc model airplane without damage.

".40 size trainer" is not a good meashure.

"we are moving towards metric, Inch by Inch"

Cheers,
Ikaros