AK420 HDX Helicopter Kit – Precision Meets Performance in 420-Class
Following the enthusiastic reception from pilots around the world for the original Steam AK420 Pro, known for its outstanding performance-to-price ratio, our HeliDirect team is proud to introduce the AK420 HDX – a refined and enhanced evolution of the beloved 420-class helicopter kit.
Whether you’re a demanding 3D pilot pushing the limits of precision flight or a beginner seeking a high-quality, cost-effective platform for daily practice, the AK420 HDX delivers exceptional value and flight performance. This upgraded version brings a host of thoughtful improvements designed to elevate both flight experience and mechanical design.
Key Upgrades & Features:
1. Optimized Layout for Performance & Cooling
- The main frame has been redesigned to reposition the Motor and ESC to the top, enhancing heat dissipation and contributing to a sleeker, cleaner appearance.
- The battery is now mounted lower inside the frame to improve the Center of Gravity (CG), resulting in a more stable flight experience and added protection during crashes.
2. Sliding-Style Battery Tray System
- Features high-precision carbon fiber rails and the proven locking mechanism from the AK700, offering both secure mounting and quick battery changes.
3. 22mm Main Grip Arms
- Upgraded from the previous design to improve responsiveness and deliver a smoother, more linear control feel during aggressive maneuvers.
4. Reinforced Solid Tail Fin
- Enhances structural durability and crash resistance, ensuring reliability even in demanding conditions.
5. Exclusive HDX Color Scheme
- The canopy features a striking new “HDX” colorway that sets it apart on the flight line and enhances visibility in the air.
- A completely new appearance with a specially designed canopy
Whether you’re already a fan of the AK420 series or exploring the 420 size for the first time, the AK420 HDX is a unique and compelling choice that balances innovation, durability, and dynamic flight performance.
Specifications:
- Main Blade Length： 380-420mm
- Tail Blade length：56-74mm
- Cyclic Servos: Micro size
- Tail Servo: Mini size
- Pinion：12T M1
- Main Gear：75T M1
- Front Tail Pulley：81T
- Tail Pulley：20T
- Recommended speed controller：6S 60-85A
- Recommended battery： 6S 2400-2800mAh
- Maximum battery size：50x38x125mm
- Recommended Battery Weight: 350g
- Recommended motor series：3120-3220
- Recommended motor outer diameter：≤43mm
- Recommended motor KV: 950-1000Kv
- Weight (No power system) Approx：~650g
- (Include blade and canopy) Approx：~750g
Package Includes:
- AK420 HDX Helicopter Kit x 1
- Steam 420mm Main Blade Set x 1
- Steam 71mm Plastic Tail Blades Set x 1
