The TT Tiger Bipe is actually a bit smaller than 40 size- its more along the lines of the old Ace 4-40 bipe, one of which I had with a .25 SF and it flew fine. I believe a .25 two stroke will fly this Tiger Bipe okay, but with no reserve power. The model is rather petite, and uses ultra-light vacuum-formed pieces for the cowl and wheel pants. I plan to reinforce those with the old nylon stocking trick, and then re-paint; but I'll be using a 52 Surpass four stroke for power.
TT reccommends their .36 two-stroke. The question is; does that mean the model NEEDS a .36, or is it because a .36 is the only engine TT makes in that range...?
Word is that the tail is weak on this airplane. Looking at the parts, I can believe it. I also intend to fabricate and fit balsa tri-stock braces for the horizontal stab. Being a kit builder too has its advantages: I already have the necessary color UltraCote and UltraPaint to handle these minor chores.
But the Tiger Bipe appears to be a nice little ARF that should fly fine. It will be some time before I get around to doing mine. BShin, keep us posted on your progress.