Top Flite F4U Corsair Engine: Saito FA325R5 Nitro: 20% Coolpower Prop: Xoar WWII 20X8 Servos: Hitec HS 645MG on everything but throttle(Futaba S3004) Weight: 23.5(Fish Scale), 24.6(Digital Scale) Balance weight: 2oz heavy hub on the prop. Balanced great with 22oz of batteries on the front of the wing.