RE: Engine Recommendation for Sig 4Star 60
Aerobender
Why do you need additional power? You will be adding more weight too. The 4* 60 flys well with a strong .46. The 4*'s are not pylon racers. You have to be careful as the control surfaces are quite large so flutter is a very real possibility at high speeds. Keep the linkages tight and seal the gaps. These planes fly very well.
My choice for powerplant would be a .61 TT Pro. These are very powerful, light weight and very easy to tune. The reliability is awesome. The second choice would be a Super Tigre .61, IMHO.
Safe Flying!