Brand Name: GTB Origin: CN Tool Supplies: CNC CUTTING Material: Carbon Fiber Upgrade Parts/Accessories: 550 V2 Helicopter RC Parts & Accs: 550 V2 Helicopter Use: 550 V2 Helicopter Model Number: 550 V2 Helicopter Remote Control Peripherals/Devices: 550 V2 Helicopter For Vehicle Type: 550 V2 Helicopter Four-wheel Drive Attributes: Assembly parts 550E V2 FeaturesFully programmable rotor head,providing 3 positive/negative deltas and numerous Bell & Hiller mixing ratios,along with numerous flybar ratios.New lightweight high precision main gear,with excellent balance and stability.The most optimal motor pinion ratio and tail gear ratio to achieve the most effcient power output and flight characteristic.Brand new CNC machined metal tail gear box,with thicker side plates to increase rigidity.The more streamlined design also allows for simpler disassembly.Dual section battery mount for optimal CG position based on battery weight.High quality 5mm carbon rod and CNC metal tail scissor control arms are used in rudder control system to improve rudder lockingand control effectiveness.Newly designed rear mounted rudder servo mount,for pleasing aesthetic as well as improving frame strength and protection to the rudder servo.Newly designed unibody stainless steel tail drive gear center mount,for more precise tail drive gear and higher tolerance.High speed rated thrust bearings in tail blade grips.High effciency torque tube drive. 550E V2 SpecificationsLength:1042mmHeight:356mmMain Blade Length:520mmMain Rotor Diameter:1188mmTail Rotor Diameter:254mmMotor Pinion Gear :16TMain Drive Gear:(170T)Autorotation Tail Drive Gear:131TTail Drive Gear:34TDrive Gear Ratio:1:10.62:3.85Weight(w/o main blade):2350gFlying Weight:Approx 3100g Buyers note: this product is Frame not included the resin cover/shell,electronics system.