Originally Posted by tlr-boise
For a warbird, you want a motor that can generate 100-120 watts per pound. So if you estimate 8lbs, then 800-960 watts. I would stay in the upper half of the range to give you that extra edge so say 880 to 960 watts. I think the 4020-12 is a good choice. The 4025 may be a bit big. Here is a data chart for the Hyperion 40xx motors tested with different numbers of cells at prop sizes:
I would think scale would be somewhere in the 12-14 inch range, so if that matters to you, figure out what is closest to scale, but make sure you have enough clearance. I would think the zs4020-12 on 4S and a 14x12e prop would be good. Producing just over 960 watts at just over 60a. I am sure some could argue that but its a good starting point I think.
You save over 100g and you can go with a lighter (and cheaper) 4S pack. However it is lighter than the Power 60 and Axi motors recommended, so may also want to look at that 4025-10 on a 5s and 13x8e if you don't think you can get the CG right with the lighter motor. You could add nose weight though.
Quiet RC Flying