ORIGINAL: mylamo
A .60 two stroke is a bit much and a .50 four stroke is weak.
I built one according to plans and flew it for years on a variety
of engines. A good .45 two stroke or .65 four stroke seems to
be about right. I had flaps and they are worth it for the fun
take offs. The airplane as designed is very strong but if you
load it up with a bunch of stuff it could use a dihedral brace.
That means six or seven pounds extra. It will,however lift it
with a .60 two stroke it just won't survive the first turn.
So with what you have learned and I value your advice since you have built/flown, a OS Max .46 two stroke would be the best choice for this kit. I agree, I do not want to add a great deal of mods/nor weight. I have a Saito .56 4 stroke, but with the engine mount/engine combo,it is too long f/the nose of the plane. I know I can extend the nose, but then I start changing the balance point!