KDE Direct XT Main Rotor Head System

KDE Direct
This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
Low Price: $116.99
Discontinued Online

This is an optional KDE Direct XT Main Rotor Head System, and is intended for use with the Align T-REX 550 and 600 series helicopter kits. This Main Rotor Head System is also compatible with the Outrage Fusion 50 and Velocity 50/N2 nitro series helicopters with the use of 10.0mm O.D. main drive shafts (see design notice below for additional required components).

This 550/600 Series XT Main Rotor Head System provides the most innovative and highly‐engineered control mechanics available. Every detail has been scrutinized and reviewed to provide the ultimate system for Flybarless flight control, without fear of the common failure modes (boom strikes, bolt shear, misalignment, etc.) that plagues other competitive offerings in the market.

To Address the Common Fears of Current Direct-Control Flybarless Systems:

  1. Bolt Shear - The XT system uses a custom-machined, class 12.9, M3 socket head collar cap screw to attach the Main Rotor Grip Control Links to the Main Rotor Holder Arms, significantly increasing the strength and durability of this critical junction for safe Flybarless control.
  2. Component Vibration and Loosening - The XT system is fully Nylon-Insert Locknut captured at all critical components to prevent any chance of vibration and high-usage related loosening of both the Flybarless control junction and the ball link adapters.
  3. Flybarless Resolution - The XT system has extended Main Rotor Holder Arms from the centerline of the main shaft, providing an increased servo travel and resultant Flybarless control resolution for all 3-axis systems, including the highly-popular Mikado VBAR and BeastX units.
  4. Versatile Connections - The XT system provides a versatile and robust method for proper ball-link alignment, without worry of slop developing from repeat use and cyclic loading. Simply adjust to your liking with the Class 12.9 M3 set screw system and when perfect, lock the position down with the included M3 Nylon-Insert Locknut.


  • Strengthened Housing Design: Geometry has been increased in key areas for significantly raised strength and stiffness characteristics in flight, without additional weight or undue material.
  • Optimized Main Rotor Grip Arms: Arms extended further from the main shaft and optimized to the mounting location for perfect flight mechanic alignment and increased servo resolution (resulting in significantly improved Flybarless control). In addition, custom Grade 12.9 M3 Socket Head Collar Screw and Locknut design used to prevent chances of bolt shear, loosening, or other detrimental failures.
  • Innovative Clamping Mechanism: Design includes a M3 clamping mechanism for a rocksolid lock of the housing to the main shaft. This key design aspect provides unprecedented accuracy and crisp feel (no rocking/bobbing effects) for all types of flying styles.
  • Robust Main Grip Control Links: FEA‐optimized design provides unprecedented strength and light‐weight characteristics for accurate pitch control.
  • Versatile and Slop-Free Connections: Ball links are securely fastened with an innovative M3 Socket Head Set Screw and M3 Locknut design; providing a robust and slop‐free hold with the unique ability for easy adjustment and fine‐pitch control.
  • Optimized Main Rotor Head System: The entire Main Rotor Head System is optimized for center‐of‐gravity alignment to the tail boom axis (for true, on‐point rolls) and further prevention of boom‐strikes on Electric and Nitro models. This was achieved by increasing stiffness in critical areas of the design.

Design Notice: To achieve the best possible setup and perfect alignment of the flight mechanics, it is recommended to use the following Align Flybarless components:

  • (1) T-REX 550/600 Series Aluminum XT Main Rotor Head System
  • (2) T-REX 550/600 Series Aluminum Main Rotor Grip Control Links, XT Version
  • (4) Radial Ball Bearings 3x7x3mm
  • (2) Bearing Collars 3x4.75x5mm (Stainless Steel 304)
  • (2) KDE Direct 550/600 Series Ball Links, Heavy-Duty 4.95mm
  • (2) 3x0.5x20mm Socket Head Set Screws (Class 12.9 BP Alloy Steel)
  • (2) 3x0.5mm Nylon-Insert Locknuts (Zinc-Plated Class 8 Alloy Steel)
  • (2) T-REX 550/600 Series Aluminum Main Rotor Holder Arms V2, XT Version
  • (2) Custom 3x0.5x26.5mm Socket Head Collar Cap Screws (Class 12.9 BP Alloy Steel)
  • (4) 3x0.5x6mm Socket Head Cap Screws (Class 12.9 BP Alloy Steel)
  • (2) 3x0.5mm Nylon-Insert Locknuts (Zinc-Plated Class 8 Alloy Steel)
  • (1) T-REX 550/600 Series Aluminum Flybarless Main Rotor Housing, XT Version
  • (2) 3x0.5x14mm Socket Head Cap Screws (Class 12.9 BP Alloy Steel)

This product was added to our catalog on September 17, 2012.