That was very informative, and it gives us a lot to think about.

I have a few questions.
How long are the peak currents sustained during acceleration? We are currently supporting 40A, but the device could probably support 55A to 80A continuously, and 100A+ for short periods of time. We just need time to test and certify the device, and push the software updates.

Do you have a good source for buying flywheels? I could not find anything for "small" (as in under 10kW) motors.

We are planning to support temperature probes. The hardware is already there and tested, but it is missing some code. One challenge is attaching the temperature probes on the motor/ESC to monitor. The best way is to glue it with a thermal paste, but it is not very reuseable.

PPhaneuf, controlling the phase with the dynamometer would definitely be possible with an I2C ESC and a custom firmware! Unfortunately, I2C ESCs are not very popular in the quad world, and inexistent (I think) in the racing world...I agree that it would be awesome though!

Static tests with a mechanical load and dynamic tests with a flywheel are two different test methods with different strength, but they can both generate all the data necessary to characterize a motor. I have a few more things to discuss about testing methods, but I will post tomorrow, as I want to add examples, and I did not finish processing my test data today.