In seven replys, only one of you mentioned what I feel the proper place to find information on proping this engine! "Read the owner's manual" and go with a prop in the middle of the recommended range! This engine IS bigger then needed for this plane. Wise throttle management will allow it's use, but don't forget this fact. The Kadet is a great trainer. As far as mild acrobatics are concerned, this plane is really limited to basic aerobatics; but, you'll have lots of fun dispite!