No the .72 4S is not too large for this plane.

Yes it will do rolls and loops without any "oil issues".

That said, an OS .46 AX may be slightly more powerful. Also the 2S is easier to tune for a novice, as you can listen for tuning differences in the engine pitch.

With a 4S you need a bit more experience and it helps to have a tach.

Other than that, you can do either.

With proper prop sizing you can make either engine perform about the same way since they are somewhat similiar in power.

If you want a faster flying plane, use a 2S or increase the pitch on the 4S with a slightly smaller prop.

If you want 3D like "prop hangs" use a low pitch wide prop ( e.g. 13x4w ) on the AX or 4S engine.


I really don't see a lot of difference between the AX .46 and the .72 magnum on this plane provided you adjust the props accordingly, but I do rate the AX as being the more powerful of the two.

Fuel use is about the same too.