I have to disagree with the idea of heavy 4 stroke engines in this plane. See above, I think the weight of the FS70II ruins the sedate flying characteristics of this plane, maybe a Saito 72 might be better.....

As for the 46LA, that's the other end of the spectrum. It's probably just adequate for power and is a bit light. It's 2oz's lighter than the Irvine 39 for example and not as powerful. I had to move everything forward with the Irvine.

On the new LT-40 ARF's (with the bolt on wing) you may have to add nose weight with a 46LA.

My preference would be a decent BB 40-46 2 stroke or Saito 72 4 stroke. Anything heavier will ruin it.