Finally got to fly the Pitts some..Flies great @ 12.5lbs. with the OS 1.6..Modified Bisson BGX-1 muffler ..Will have to pump it tho, main is out 3.25 turns and still goes into 2 cycle on vertical..Over all an excellent flying craft, much better than the old House of Balsa S2 and the Midwest S1S..

Rick