The outer dimensions and weight of the one listed above are about the same size as the stock motor. I did some more playing around with motocalc, and it suggested a 4x1 prop with a brushless motor running at 6200 Kv or a 4x2 prop running at 4800 kv. Right now I'm looking at some Feigao motors that might fit the bill. Can anybody think of anything I might be missing?