RE: Is an os .46 fx suitable for a sig LT-40?
both are a great engine, both will fly your LT-40 very well... you must now ask yourself this question.... which sounds better?
I personally love the sound of a 4stroke, too bad I don't own one. My LT-40 has a TT46pro on it, and it flies great.
it boils down to personal preference with those two engines.