I flew mine using a master airscrew 16x6. Took off on 1/3 throttel. I have yet to find a practical reliable way to route the exhaust out of the lower middle portion of the cowl that will stand up to heat and vibration. speaking of overheating, no problems there. I used onboard battery for glow power to maintain idle otherwise it would load up and quit without. Only expect 10 to 12 min. of flight with supplied tank. that pump is thirsty. spend a little extra and buy a good aluminum spinner like the MAXX products 2 3/4". I used the supplied spinner and on the second flight the spinner blew up like a hand grenade when the engine backfired due to a slightly rich mixture. quite comical to watch however.