Main Drive Gear, 115T, MOD1.0, HD for ALIGN T-Rex 700/800 Series Helicopters

Product has been archived, and is no longer available for purchase. This page is for reference only.



The new Main Drive Gear Heavy-Duty series is precision CNC-machined from a proprietary Nylatron MoS2-Filled Type 66 Polyamide, one of the best materials available today for polymer gears and the perfect match for an extremely strong, smooth running, and durable power transmission for the T-Rex 700/800 series helicopters. The gear is composed of 115 teeth, utilizing the metric MOD1.0 tooth standard for incredible strength. Through months of testing, the gear has been optimized to include numerous design features for optimum performance, including:

  1. Increased gear height to 12 mm (stock is 10 mm) for increased strength and contact surface area.
  2. The tooth involute profile has been optimized through numerous design iterations for increased tooth engagement and strength, providing an incredibly quiet and durable gear for a MOD1.0 power train.
  3. Weight was reduced through FEA optimizations of the machining pattern to significantly reduce weight, while maintaining full strength of a solid-gear profile.
  4. The self-lubricating properties of the proprietary MoS2-Filled Type 66 Polyamide material provides exceptional wear and noise properties, providing a gear that can withstand the harsh nature of hardcore 3D flight.

Note: Review the corresponding gear case installation diagram for correct installation procedure for optimal strength and longevity.


Material: Nylatron Proprietary Type 66 Polyamide

Models: All ALIGN T-Rex 700 and 800 series (replaces stock ALIGN part #HN7019A). This gear is not recommended for the T-Rex 700N, 600, and 550 series helicopters and the reduced-height version of the gear (KDE Direct T-Rex 550/600/700 Series Main Drive Gear, 115T, MOD 1.0) is recommended for those setups to achieve optimal fit and performance.


  • One (1) T-Rex 700/800 Series Main Drive Gear, 115T, MOD1.0, Heavy-Duty

Finish: Precision CNC-machined, Nylatron Proprietary MoS2-Filled Type 66 Polyamide

Weight: 55 g (design is FEA optimized for maximum strength and minimum weight)

Comparison Matrix:

Standard Acetyl (POM) Resin Gears KDE Direct Nylatron Proprietary MoS2-Filled Type 66 Polyamide Gears Design Advantages of the KDE Direct Main Drive Gear, 115T, MOD1.0, HD
Density 1.41
19% Less Weight
(Reduced weight to the helicopter)
Tensile Strength (Ultimate) 9,500
32% Stronger Tooth
(More power and torque capability)
Shear Strength 8,000
32% Stronger Tooth Root
(More power and torque capability)
Flexural Yield Strength 12,000
42% Stronger Tooth Root
(More power and torque capability)
Coefficient of Friction 0.250 0.200 20% Less Friction
(Less noise, more power transfer)
K (Wear) Factor 200E-10 90E-10 55% Less Wear
(Longer lasting gear)

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