I kinow the 4*. The airfoil is like an Eppler 197! It flies exceptionally well on the wing with a MVVS .61! We had one in our club thus powered, and it flew a modest Imac program.
Having said that, there is the "BUT". The guy said 12 - 13 lbs flight weight which is heavy for the 4-star. If you want to 3D that kind of weight, you will need a bit more power than that so it will fly on the prop.
I will fly any plane if it has a static thrust of half the plane weight, or even less power if the plane is designed for it.
BTW, did the oils arrive?
ORIGINAL: Tired Old Man
Pe,
A 4* has a modified Clark Y airfoil. It's got more lift capability than it does weight by a large margin. It won't have unlimited aerobatic capability with a 20, which a 30 would provide, but the weight of a 30 is a lot on a 4*. Then again, my opinion has a 20 as too much weight also but what can one do? When they first came out we were flying them (kit builds) with Saito 1.50's and they had pretty much unlimited aerobatic capability. Even an OS 1.20 pumped 4 stroke was more than enough for them at heavier kit build weights.