I have one and they are all very tail heavy. when I sday very I mean VERY heavy. It takes about 5 to 6 oz. to level them out. Move the battery all the way forward under the tank and move the engine out as far as possible. Add 2 oz. lead weight to the spinner and 2 more on the firewall and you wilo have it. It flys great but the vertical stabizer have fallen off on a number of them in flight.