Steam AK420 3D RC Helicopter

The Steam AK420 helicopter represents the latest innovative creation from the Steam team, setting a new standard for helicopters in its class. Drawing from the best features of previous models like the Miao 550/600, Dancer 700 V1/V2/V3, AK400, and AK700, the AK420 is the culmination of years of engineering excellence.


Specifications:
Item Brand: Steam
Item Model: AK420
Main Blade Length: 380-420mm
Tail blade length: 56-74mm
Cyclic servo: Micro size
Tail servo: Mini size
Recommended ESC: 6S 60-85A
Recommended battery: 6S 2400-2800mAh
Recommended battery weight: 350g
Max. battery size: 50x38x115mm
Recommended motor series: 3120, 3220
Recommended motor outer diameter: <=43mm
Weight (no power system): about 650g
Weight (include blade and canopy): about 750g

Standard Gear Specifications:
Motor tooth: 12T
Belt Main Gear: 75T
Main Teeth of a belt: 81T
Belt Tail Gear: 20T

The Steam AK420 continues low-profile rotor head design, integrating these classic design elements with both structural integrity and aesthetic appeal. It's a machine that will ignite your passion as it soars through the sky.

The canopy is crafted from ultra-thin fiberglass, custom-made for a streamlined, aerodynamic fit.


The integrated landing gear is injection-molded from high-strength reinforced plastic, featuring a low-profile, streamlined design with multiple mortise-and-tenon joints, which also enhance the canopy's locking mechanism. This approach boosts structural integrity without adding extra weight.


The metal blade grips feature a dual-hole design, ensuring both axial and radial stability. This patented innovation includes angled ball head mounting holes that accommodate 23.5mm and 24.5mm ball heads, allowing for a subtle 1mm adjustment to fine-tune flight sensitivity. The dual-hole design offers exceptional value, allowing you to use either the inner holes with 380mm main blades or the outer holes with 420mm blades. Both blade sizes deliver a comfortable flight experience, fully compatible with this helicopter.


The open-structure carbon fiber battery tray simplifies battery installation while reinforcing the front frame. In the event of a severe impact, the battery can detach from the frame, reducing damage to components.

The carbon fiber motor protection plate expands the fuselage width, accommodating larger 32-series motors.

The motor mount is machined from high-precision 6061T6 aluminum alloy using a five-axis CNC process. With multiple cable exit points, this component disperses mounting stress, reducing gear wear caused by vibration. The high-integration design results in a lighter, more efficient structure.


The main gear, as thick as a brick with a 12mm thickness, redefines industry standards. It is CNC-machined from imported engineering plastic (POM) with high-precision gear hobbing. The overall enhanced mortise-and-tenon frame design delivers a lighter and stronger structure. For optimal wear resistance, apply Steam rubber grease HOT00006 during operation.

The metal main gear hub uses wedge bearings to secure the main shaft, providing three times the locking force of standard needle roller bearings. This effectively prevents main shaft slippage. The thickened center hub ring minimizes gear wobble at high speeds, while the upper and lower flange bearings make installation easier.

The tail drive gear is also CNC-machined from 6061T6 aluminum alloy, featuring high-precision gear hobbing and a reinforced mortise-and-tenon frame design. This significantly reduces manufacturing costs. The embedded spacer design structure enhances the installation experience.

The electronics board provides a stable mounting platform for the gyro, receiver, and antenna, while also supporting the tail boom clamp. Made from high-modulus carbon fiber, it offers exceptional bending and shrinkage resistance, with each piece precision-machined by CNC for ultimate accuracy.


Mounting the tail servo directly onto the tail boom eliminates the need to adjust the linkage length, making installation and maintenance easier. This tail servo mount also prevents slippage and allows for easy belt tension adjustment. The 16mm diameter tail boom design reduces tail vibration.


The robust metal tail case provides strong support for the tail control system. The tail blade grips are CNC-machined from 6061T6 aluminum alloy, featuring a three-bearing design that extends the radial distance between the bearings and the shaft, effectively reducing lateral wobble.

The tail control L-arm is injection-molded from high-strength reinforced plastic, with multiple mortise-and-tenon rib designs for added reinforcement. This meets the demanding load requirements of aggressive flight maneuvers, significantly enhancing flight stability.

Kit Package Included:
Steam AK420 RC helicopter frame kit x 1 (unassembled)
Main blade x 1
Tail blade x 1

Combo Package Included:
Steam AK420 RC helicopter frame kit x 1 (unassembled)
Main blade x 1
Tail blade x 1
Zhaoyi 3225 1000KV Brushless motor x 1
80A V5 Brushless ESC x 1
GDW DS290MG servo x 3
GDW DS595MG Servo x 1
DUPU 6S 2200mah 70C Lipo Battery x 1