SteamRC AK420-HDX Helicopter Kit (with Blades)

SteamRC AK420-HDX Helicopter Kit (with Blades) 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

 

Manual: Download

 

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Shipping & Payments

Click the Shipping & Payments tab above the listing description for more info

Payment

Accepted Payment Methods

Immediate payment is required upon selecting "Buy It Now" or upon checking out through the cart.

We accept payment via U.S. PayPal accounts and all Major Credit Cards, Debit Cards & Google Pay.

We are legally required to collect sales tax in those states and localities where we maintain a physical presence (nexus).

The applicable amount of sales tax charged to an order will be calculated based on the shipment destination's state and local sales tax laws.

Thank you for shopping with us on eBay!

Returns

Returns are accepted

Items must be returned within 30 days of the auction ending

Buyer will pay for return shipping.

Additional Information: HeliDirect offers a (14) day return policy for all new, unuséd items that are in brand new condition without fault, damage or otherwise. Items being returned must be brand new without any use. Any kits that have been partially or fully built, items that have been soldered, batteries that have been soldered or charged, or products that have been cut, punctured, modified or otherwise, will not be accepted as a return. Aircraft that have been “test flown” will not be accepted as a return item. - Valid returns are based upon factory sealed products that are in 100% resale condition. We will charge 20% restocking fee for this case. Shipping fee wont be refunded. - If the item(s) received has been opened, uséd or damaged, no return options will be offered. Outside of warranty, any item without fault or warranty related issue cannot be accepted back unless the item is in brand new condition, as we cannot offer an opened or uséd item to our customer base. - If a non warranty item is being returned based upon valid return guidelines (brand new, unuséd, factory sealed packaging), the original shipping fees paid by HeliDirect (if Free Shipping was uséd) will be deducted from the overall sum total. If the customer paid for a specified shipping method, these shipping fees will not be valid for a refund. ***Returning Fragile Items - In regards to returning fragile items that can be easily damaged, it is the customer’s sole responsibility to ensure that the package is packed and sealed safely, as any damage via return shipping will not be accepted. If a damaged item is received, it will be returned to the original shipping address, and will need to be settled via the customer through the shipping agent uséd. HeliDirect will not be involved in any claims, refunds, credits or otherwise for return shipping damage. *** Warranty Returns - Faulty / Damaged Item(s) Received - For any item that is faulty, damaged, or falls relating to warranty related issues, please contact our customer service department for help, and we will be sure to assist you in every way possible in regards to the matter at hand. - Please note that certain / select products we carry may be replaced or repaired direct via the manufacture, no matter when the item / product was purchased. In this case, feel free to contact us for help, and we will issue you the proper contact information so the item can be addressed via the manufacturer. However, we will be certain your warranty is properly addressed. - For valid returns, once an RMA number is received, please ship back to us via standard shipping – no upgraded shipping method, such as 2nd Day Air, Overnight, or EMS will be credited or refunded. Returns can take several days to be processed. - For DJI brand, please contact directly DJI service center. ***Return Processing Requiring Product Testing - For any item requiring testing,as the testing process via our in house technicians will require the necessary time to problem solve your return. Our goal is to isolate whatever trouble your item(s) may be experiencing, and as soon as we have the available information to proceed, you will be updated regarding this. RMA Number Information All approved return items will require an RMA number before being shipped back to our location. This number aids us in the ability to properly handle your return. Without an RMA number, your package has a probability of being mis-handled, lost or delayed, and HeliDirect will take no responsibility for any return that does not have an approved RMA number. Please contact our staff for proper RMA information, as we are happy to help you. ***Note; For all return products without contact us before. It means you violate our return policy. eBay integration by