Well, with OS 160 FX you get the benefit of swinging the Graupner 16x8 3-blade prop for that cool look factor.

I agree that 108 is plenty power for warbird this size. I had a 108 that's on-par w/ my YS 120 in power. I just think it's too light to balance this plane. I also don't like putting battery too close to the engine because of the vibration, not that I've killed batteries this way. Just personal preference.

Regarding dead weight though, this plane has really light wing loading for its size (even lighter than some of my 120 size aerobats). Adding some weight will actually make it land more scale like, if it rhymes with you.

Personally, I feel the best engine for this plane would've been the Saito 170 3-cylinder. Oh that 3-cylinder sound… Too bad it doesn't fit in the cowl. Believe me, I really want to make it happen, but I got some template for the 170, and the cowl will have 6 golden valve covers protruding...