Mustang:

Great looking scratch bird. Your only apparent weak link overall appears to be the Tower 75 motor. A couple of club guys have them, ok for sport flying but not much on rpm even with a decent Nelson or Jett muffler. If you dont want to pay for a Jett 60LX (the ultimate in great sport high rpm motors IMHO) you may try a Webra 55. Thing is a beast and will turn a 9 X 10 (yess 10) apc over 18K with a jett ultra thrust muffler. Shocked me frankly. I expected the engine to be very hot after its first flight proped that way, but no, normal and still has its normal compression. My Webra 35 gets so hot with a 9 X6 apc that all compression is gone after its first run of the day, and then comes back and runs ok again after a few hours. Same story with 8 X 6 and 9 X 5 etc. Screams its guts out for you and then must rest for a day or so. Too bad, hot little cheep motor. Before you guys yell, I admit the motor has not seen much bench break-in time. Circumkstances demanded it must perform now, it does, for one run. The 55 had almost a gallon of 10% plus 4 OZ castor, prior to being put to work on its first flight.