ALZRC TREX 450 PRO 3D Carbon Fiber RC Helicopter Kit Feature:-Main rotor head group made of aluminum alloy CNC machining、 its mechanical structure is more robust. With high precision and stability control arm bearing group、 andthe best mixing ratio mix 、be provided with  the best flight stability and dynamic flight performance.-New improved design of the fuselage side panel、 the configuration and the whole line of denso better convenient and easy、 let body appearance simple and clean.-Using integrated type spindle and server fixed seats、 with the side panel and modify parts、 allow the server to tear open outfit is more simple、 convenient and increase the convenience of maintenance.-Integrated type battery\/governor fixed seats、 can according to different specifications battery、 battery fixed position are adjusted to achieve best focus state helicopter. Can reduce the number of screws、 shorten the time of the machine and repair machine more quickly.-Integrated cross disk guide and gyroscope denso in carbon fiber fixed plate fixed bridge design from the fuselage、 effective use the body space for denso configuration is more elastic.-Highly efficient shaft transmission design、 greatly reduce the power loss of the belt drive、 the relative increase in flight dynamic performance.-Unique design of centrifugal force balance tail rotor cone holder、 effectively increase the tail rudder and gyro performance、 to make the operation effect and the tail rudder lock tail more solid more accurately.-Fixed vertical tail server design、 let the helicopter focus more focused on the center position、 make 3 d flight has superior athletic performance.Specification:\u25cfLength:640mm\u25cfHeigh:230mm\u25cfMain Rotor Diameter:710mm\u25cfTail Rotor Diameter:158mm\u25cfMotor Pinion Gear:14T\u25cfMain Drive Gear:150T\u25cfAutorotation Tail Drive Gear:106T\u25cfTail Drive Gear:25T\u25cfDrive Gear Ratio:1:11.5:4.24\u25cfWeight(include motor):550gPackage Included:1 x ALZRC 450 PRO  Kit Product Detail