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Just 'Cuz Robotics

RDY-5536 1200kV Hubmotor: Battle-Ready Weapon Motor

RDY-5536 1200kV Hubmotor: Battle-Ready Weapon Motor

Regular price $95.00
Regular price $0.00 Sale price $95.00
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The Ultimate Battle-Ready Combat Robot Weapon Motor

In a groundbreaking first for robot combat, off-the-shelf hubmotors are now a reality! Download the 5536 CAD here! 

The RDY-5536 Hubmotor is an evolution beyond anything available for combat robots before. Enter the space age, with high-strength 7075 aerospace aluminum construction. Massive bearings. Battle-hardened epoxied magnets. Ultra-flexible high-temp silicone wires. Zero weapon belts. These are just some of what you get with your very own hubmotor!

LAUNCH WEEK PROMO: $10 off with code NO_BELTS_FOR_ME, valid for 20 uses or until 3/29/24 at 11pm EST! One use per order and per customer, discount does not stack. 

What's Included when you buy a Complete Motor:

  • 1X RDY-5536 complete motor, combat-ready out of the box!
  • 1X RDY-5536 7075 aluminum clamp ring
  • 6X M4 weapon clamp screws

This motor is intended to be mounted to a rigid robot frame component and as such does not come with a mounting plate or bracket. You must design to mount BOTH SIDES of the motor to your robot, with frame rails exactly 36mm apart.

What's Included when you buy a Replacement Magnet Ring:

  • 1X RDY-5536 magnet ring, epoxied and ready to go!

Specs and Usage


  • Dimensions: 55mm diameter, 36mm length
  • Stator Size: Roughly 28 x 12mm (similar to 3536 can motors)
  • Weight: 206.6 grams (7.3 oz, 0.46 lb) with very long wires
  • Gigantic 6805 bearings with >600 lbf static, >900 lbf dynamic load ratings
  • KV: 1200kV (Yes the label is wrong on this first batch, it says 1250 but should be closer to 1200. This is approximate, actual KV may vary by +/-10%)
  • Voltage: 3S-6S with appropriate ESCs
  • Power and Current: test data coming soon!
  • Use 8X M5 bolts, or 8X SHORT THREAD 6mm shoulder bolts for mounting to your robot frame. MAKE ABSOLUTELY SURE NOT TO USE SCREWS THAT THREAD TOO FAR IN OR YOU WILL DESTROY THE MOTOR COILS!
  • No circlips, belts, or set screws!
  • Super strong, curved neodymium magnets
  • Epoxied magnets for extra durability
  • High-temperature copper windings
  • 18AWG, 18 cm (~7 inch) long silicone wires rated to 200 degrees C
  • Winding Resistance: ~111 milliOhms
  • Designed for use with 6mm or 1/4" thick weapon blades. Thinner can be used with a spacer, and thicker will be fine but will be offset from center and may require longer M4 flathead clamping screws. 

3D Model Available Now!

CAD download includes Division V4's blade with the proper spline geometry needed. We recommend offsetting the spline by about 0.006" (0.15mm) from the actual motor profile for a better weapon blade fit. 

Note: The first time this motor is spun up it may draw unusually high current even with no load. This is normal and seems to be a result of the big bearings and their grease needing to warm up and distribute evenly. After a couple of minutes the no load current for the motor drops significantly as the motor and bearings heat up. Warning: The outside of this motor is like a big heatsink and can get very hot!

WARNING: Using standard shoulder bolts or M5 screws that are too long will destroy your motor. Shown here: LEFT short thread shoulder bolt vs RIGHT standard thread length. If you buy a normal bolt, cut the thread to protrude no more than 5mm into the motor. 

Experimental Bench Test Data: TBD (Using Pariah 70A ESC)

Division V4 uses this motor with a 1/4" thick, 6 inch diameter blade. The current draw on 4S LiHV of this setup at max speed is around 25 amps continuous with a peak of around 45 amps on spinup. More testing needed on 3S and 6S voltages. 

Power and ESCs

For best results, pair with our very own Pariah 70A ESC with AM32 firmware pre-programmed for this very motor!

This is a custom motor and not a conventional one so a propeller chart is a useless stat to compare this to. You should use a 50A or greater rated ESC. This has been tested and working with 70A BlHeli32 and AM32 ESCs, as well as our 35A ESC on up to 4S (though for larger than 4" weapons we strongly recommend the Pariah 70A). 

Actual current draw and torque are highly dependent on your exact ESC and configuration, battery, voltage, and loading. Air resistance and tip speed for your weapon play a huge role in the current draw of your system. Even reducing speed by 20% might cut air resistance in half. 


Warning: combat robots are not toys! They are extremely dangerous. Click here for a safety video.

Testing a robot with an active spinning weapon should never be done while maintaining a line of sight with the robot. Ideally, you should be testing inside an enclosed box or arena with at least 1/4" thick polycarbonate windows or top to see through, and 1/2” or thicker plywood or MDF construction. Operation (Including testing) outside of a suitable arena or test box could cause serious injury. By purchasing this product you acknowledge that you are responsible for the safe use of this product and that Team Just ‘Cuz Robotics or its employees are not liable for any injuries or damages.

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