I dispute that there was no answer.
OK - Ive got 2 Evolution motors, a 26GX and a 33GX.
The 26GX in my plane weighing 10kg is sluggish as hell on the recommended 18x6 prop., the motor is rated 3.8HP.
I am installing the new 33GX I have found, just waiting for somebody to make me another part for it.
GO......