Type: Direct Drive Motor Helicopter ModelMain Blade Length: 380~420mmTail Blade length: 56~74mmCyclic Servos: Micro size Cyclic ServosTail Servo: Mini size Tail ServoRecommended speed controller: 6S 60~85AmpsRecommended battery: 6S 2400~2800mAhRecommended battery weight: 350gRecommended Motor Series:3120,3220Recommended Motor Outer Diameter: ≤43mmMaximum battery size: 50x38x115mmWeight(No Power System): u2248650gWeight(Include blade and canopy): u2248750gMotor Tooth:12TBelt Main Gear: 75TMain Teeth of a Belt: 81TBelt Tail Gear: 20TFeatures:- The painted hood is made of ultra-thins fiberglass fiber, and the overall streamlined wrapping and fitting design brings good aerodynamic performance.

- The integrated tripod is made of high-strength reinforced plastic material injection molding, with an overall low-lying streamlined design, multiple mortise and tenon design, and the hood card position is increased. Without increasing the weight, the structural strength is effectively improved.

- The metal large propeller clamp is matched with a double-hole large propeller clamp arm to obtain axial and radial high-strength locking. This is an innovative patented design. The inclined ball head mounting hole can have two sizes of ball head mounting holes of 23.5/24.5MM at the same time, which can make the ball head produce a subtle change of 1MM from the center link to correspond to the required flight feel. The double-hole design can bring high cost performance of the product. When using a 380MM main rotor, the inner ball head mounting hole can be used. When using a 420MM main rotor, the outer ball head mounting hole can be used. Both sizes of main rotors can control this helicopter and get a comfortable flying feel.

- The open carbon fiber battery panel facilitates the installation of the battery, while strengthening the front frame structure of the fuselage, allowing the battery to be separated from the fuselage when subjected to a strong impact, reducing damage to components.

- The carbon fiber motor protection plate can effectively widen the width of the fuselage, making it convenient to use larger 32 series motors.

- The metal motor seat is made of 6061T6 aluminum alloy with high-precision five-axis CNC processing. A multi-directional motor line outlet is reserved. This part can disperse the stress of the motor seat installation and reduce the wear of the gear disc caused by vibration. The highly integrated design brings a lighter and more reasonable structure.

- The large gear disc with a thickness of up to 12mm redefines the gear disc standard in the helicopter industry. It is made of imported Saigang material and fully CNC processed, with high-precision CNC gear hobbing, and the mortise and tenon design of the overall enhanced large frame, which brings a lighter and stronger structure. The strength of Steam"s large gear disc is unique. Please apply Steam rubber grease HOT00006 when using it to obtain better wear resistance.

- The metal main gear center seat uses a wedge bearing to lock the main shaft. Its locking force is 3 times that of an ordinary needle-type one-way bearing, which can effectively prevent the main shaft from slipping. The thickened center seat aluminum ring can effectively prevent the large gear plate from shaking during high-speed operation. The use of upper and lower flange bearings makes installation more convenient.

- The metal tail drive main gear is made of 6061T6 aluminum alloy material and is fully CNC processed. High-precision CNC gear hobbing, the overall enhanced large frame split mortise and tenon design, greatly reduces the manufacturing cost, and the embedded gasket design structure brings a better installation experience.

- The electronic equipment board provides a stable installation platform for the gyroscope/receiver/antenna seat, and supports the tail pipe clamp seat. It uses high-modulus carbon fiber sheet with extremely strong bending strength and shrinkage resistance, and high-precision CNC single-piece precision processing.

- The advantage of the tail servo locked on the tail pipe is that there is no need to adjust the length of the pull rod, and it is easy to install and maintain. The design of this tail servo seat has a tail pipe anti-slip effect and can easily adjust the belt tightness. The tail pipe design with a diameter of 16MM reduces the vibration of the tail.

- The sturdy metal tail gearbox structure design can provide strong support for the tail control system. The tail rotor clamp is made of 6061T6 aluminum alloy and is fully CNC-molded. The three-bearing design lengthens the radial distance between the bearing and the shaft, effectively reducing lateral swing.Package Included:

KIT:1 x AK420 Helicopter Fuselage
1 x 420mm Carbon Fiber Main Blade
1 x 71mm Plastic Tail BladeBNF:

1 x AK420 Helicopter Fuselage
1 x 420mm Carbon Fiber Main Blade
1 x 71mm Plastic Tail Blade