This plane is not intended to fly fast, it's an aerobat. The elevators are huge, and the ailerons are quite big for this size plane, and I guaruntee if you use the stock 3mm hardward that comes with it, you will flutter it right into the ground. If you want fast, buy a Midget Mustang or a Shoestring. I have a Webra 1.20 in mine, but I use a 4 pitch prop, so my speed is way down. The ST 90 will fly it just fine. Watch out for the stock tail gear, and weak stock hardware. Do yourself a favor and buy some 4-40 hardware and a Sullivan tailwheel.