Originally Posted by
Glowgeek
My 15.5 lb 1/4 scale J3 flies nicely with a 26cc 2 stroke gasser. A little more than scale power, nothing close to unlimited vertical but I don't have to cut loops unreasonably short at the top. A suitable gas converted 4 stroke single might be something like a Saito 220 (36cc). With glow or gas I add 50% to the recommended 2 stroke to size for 4 strokes. My 220 is slated to power my 1/4 scale Taylorcraft Clipped Wing when I get it running right. Similar weight to the Cub.
If that Husky ends up weighing 19-20 lb I would be looking for a bigger engine than an OS 160 twin, even on methanol. That's just me though.
Depends also a bit on the altitude you live at, I guess.
A 26 cc 2-stroke gasser (I am assuming a zenoah here) is in normal trim and common used props like 18 x 8 not all that more powerful than the OS/ASP. Don't get me wrong, it absolutely IS, but not shockingly so. Not like "twice as strong" or anything like that...
I mean, I know you can get 3,5 horses from that Zenoah, but for that it needs to run 10~11K, and that is not an RPM you want to fly around with. Starts to sound obnoxious. 3 hp, or perhaps slightly under, is more realistic. I have seen 2,4 hp from my ASP twin, and in flight it exceeds that even.