hi i learned to fly last spring on a hanger 9 arrow with evolution .45 trainer i noticed that you still have stock three blade prop on it. if when flying it it seems to be pretty lasy on take off you might want to consider a 10x6 two blade. another thing i did was take off the stock flywheel and put aluminum flywheel on you can get from evoluition. i also was having problem with the way it was running and took the baffle out of the exhaust and it made it run alot better. just thought i would share my experiences with you might help might not. i liked having the power that these simple cheap mods provided. i think the other guys ansered you questions fine. you just want to make sure you can cut the trottle off without putting your finger over the carb and you don't whant to have the servos screaming at you because it will eventually burn up a servo.