“Just changed out the stock motor and ESC from the FW Mustang Iron *** and WOW!!!! what a big improvement on the top end speed. Much Faster. will also handle the 4 blade prop as well, but is much better with the two blade prop and more efficient. Highly recommended upgrade!!! Motor and ESC change out took less than 5 minutes. Took an already great flying plane and just made it better. This could easily be added to the FMS planes as wellNote: you will also need to upgrade the ESC to something 85A or bigger. I chose the Geko series 85A ESC from here. OUTSTANDING ESC.”