Brushless Motor Dynamometer from RCbenchmark

27 Oct.,2022


WingFlying Drone Thrust Test

RCbenchmark dynamometer website

Please comment and send feedback below. A few months ago, I posted here asking if you would be interested in a dynamometer. I received quite a lot of comments. My colleague and I had the idea of a dynamometer for brushless motor after working over one month full time on a custom motor tester for our drone. We thought that there should be a better solution available on the market. Since there wasn’t anything, we have been working full time on that project, and we are ready to release the result of many iterations and prototypes!


Our dynamometer can fully characterize propellers, and brushless inrunners and outrunners up to 40A and 3kg of thrust. The tool measures thrust, torque, voltage, current, RPM, and it has a precision ohmeter to measure the motor's coils resistance. The data is saved to a CSV file manually or continuously. Here are the technical specs:

 Voltage (0-35 V)

  • Current (0-40 A)

  • Thrust (±3 kg)

  • Torque (±1.5 Nm)

  • Rotations per minute (up to 190000 erpm)

  • Motor winding resistance (0.003 to 240 Ohm)

  • Accelerometer on PCB

See the datasheet (PDF) for more information.


Our software is open source (link to the gitlab repository), and we are actively developing it. We hope it will be hacked and improved! It has safety cut offs (reduce your chance of burning your motor), a calibration wizard, unit selection, CSV export, and much more.  If you are curious, have a look at sample results of tests made with our dynamometer here.


At the time of writing we have 14 units left available at a reduced priced for the beta period. Please join us in this project and send us feedback in the comments below!



Charles and Dominic