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Same Proven Power. Refined MKIV Mechanics.
The CRS3500 MKIV builds on the proven CRS3500 platform with the same motor performance as the MKIII, while introducing important mechanical refinements: the gearbox, front propeller mount, and motor shaft bearing support. It keeps the strong, smooth, contra-rotating performance that made the CRS3500 a top choice for F3A, while improving usability, durability, and overall mechanical refinement.
 
📌 What Makes It Special?
Proven CRS3500 motor platform, same power as the MKIII
Refined MKIV gearbox design
Improved front propeller mount for faster and easier tightening
Upgraded bearing on the top of the motor shaft
Smooth contra-rotating performance for precise F3A flying
Excellent speed control on uplines, downlines, and complex schedules
Reliable, lightweight system designed for competition use
Optimized for modern 23–24” F3A propeller setups
 
A great match for biplanes, high-drag models, and demanding F/P schedules
The MKIV is about refining the CRS3500 system mechanically, making an already proven power unit easier to use, more robust, and even better prepared for serious F3A flying.