ORIGINAL: ChriCYWG
I have several of the H9 warbirds that need building.. Spit, Hellcat, and Thunderbolt... Im thinking the 20cc would be the correct choice??
For the Spit and the Thunderbolt, the 15GX would probably be better. You might look at the 20GX for the Hellcat, but I'm sure the 15 would fly it nicely, too.
I prefer better-than-scale power in warbirds because I think it's more fun; however, in recent years I've started to balance that element with keeping the airplane light. This is why I'd look at the 15 first for these airplanes.