RAW NITRO TECHNICAL SPECIFICATIONS • RTF Approx. Weight: 4000 g (RTF no fuel). • Main blade length: 650mm to 730mm ( 690mm included ). • Tail blade length: 105 to 115 mm ( 105mm included ). • Main rotor diameter: 1558 mm (with 690 mm blades). • Tail rotor diameter: 284 mm (with 105 mm tail blades). • Engine: .90 to .105 Nitro Heli Engine. • Cyclic Servos: Standard size 40mm. • Tail Servo: Standard size 40mm. • Throttle Servo: Mini size 35 mm or Standard size 40mm. • Main Rotor Ratio: 7.7- 8.3 :1 (27T included: 8:1). • Tail Rotor Ratio : 5.1 - 4.9:1 ( 22T included: 5.1:1 ). • Tank Capacity: 650ml. • RX Battery Size: 2S-1800 / 2500 mAh.