This is the radio controlled, electric powered, flybar version Raptor 90G4 E720 Helicopter Kit. Designed by Shigetada Taya, FAI World Champion. For Intermediate to Advanced RC Heli Pilots. FEATURES: Control System: 135/140° Collective Cyclic Pitch Mixing (CCPM), +/-15° collective pitch range, adjustable Bell-Hiller mixing ratio can be set for F3C or 3D Main Frame: 0.08" (2mm) thick carbon Rotor Head: All metal Drive System: Torque tube for 100% power transfer and crisp tail rotor response Motor Mount: Adjustable, top mounted motor placement for better center of gravity, adjustable pinion bearing block Main Shaft: 15mm diameter hardened steel, hollow design Tail Boom: Carbon with carbon support and one-piece metal bracket, bottom mounted ESC on tail bracket for efficient heat dissipation and easy maintenance Tail Rotor System: All metal, heavy duty with rotor rod guide and heavy duty helical bevel tail gears Tail Case: One-piece machined metal Tail Blades: Carbon, 4.1" (105mm) in length Canopy: FRP, preprinted red in color Main Gear: Lightweight and vented heavy duty 17mm helical Landing Gear: Nylon with aluminum skids INCLUDES: Flybarless Raptor 90G4 E720 Helicopter Kit with FRP Canopy, Tail Boom Motor Mount, Quick Release Battery Tray, Flybar and Instruction Manual REQUIRES: Motor: Brushless, 470 - 520kV, 450 - 470kV, Scorpion brand or Steve Neu 1912 520kv motor recommended (neither brand carried) Pinion Gear: 12T (w/470 - 520kV motor) 13T (w/450 -470kV motor) Radio: At least 6-channel with receiver battery Gyro: Heading hold Battery: 12S (6S x 2) 5000 - 6000mAh at least 25C Battery Charger: LiPo compatible ESC 80 - 120A Main Blades: 690mm or 710mm carbon fiber Tools and field equipment SPECS: Fuselage Length: 53.3" (1354mm) Main Rotor Diameter: 63" (1604mm) Tail Rotor Diameter: 11" (280mm) Weight (Fully Equipped): 8.27lb (3750g) Height: 16.9" (430mm) Main Rotor Length: 27.2 - 28.3" (690 - 720mm) Tail Rotor Length: 4.1" (105mm) Main Gear/Pinion: 111/11T standard, (12 or 13 optional) Gear Ratio: 1:10.09:4.67 standard jxs 09/23/11 ir/jxs