You can test 1/8 scale motors with them. They are not limited to the size of the motor. They are limited to the voltage input and amp load.

The Fantom Helix V1 had the highest RPM reading, that I have tested. It was about 26,000 RPMs. However, The RPMs tanked when I put a load on it. The gauss was about 1720. Next highest RPMs was the HW G4R. It spun at about 25,000. However, the RPM's also tanked under a load. That was weird because the gauss was around 1765. However, the windings looked a little loose.

Many have forgotten that Tekin is also rpm based and it took a certain gearing to make it come alive. Go search for Jason Snyders video of him running 13.5 4wd and him hitting the sweet spot and was the only one that could clear a certain triple the entire race where others had fade. The Fantom V1 fell short of torque but the V2 corrected this. When shopping for a motor check into that company and see if their motors are rpm or torque based. Get was you need for your application of racing and go have fun. I know how it feels to be under powered motor wise :-( I would rather run a brushed motor than the motor I chose to run a while back….lol

I agree with the Tekin. It was right up there with Surpass V6. Also, I believe Tekin have different rotors that are ROAR certified for stock motors.

They also fell into the tuning rotor faze just like everyone else.

I just started testing some 4 pole motors. I thought people always said zero timing for them. First I tested hw 1900kv. Lowest timing is 12 and high is 28. (Set at 12)So they never even let you get down that low. Second revtech 2000kv. Goes from negative 6 to plus 6. (Set at plus 6 )Third is rush 2150. Can go from neg 30 to plus 30. ( I also Set at plus 6) what's the latest on timing them. I did a search and found about nothing. Thanks.

Here's my video on swapping rotors and building cheater motors.

Is there a device that will measure the magnetic strength of the stator when it is charged?

There are plenty of gauss meters to find and also easy to make with an analogue HALL sensor. And then you probably need a constant current to power a coil.

But I think if you want to do it right you need to use some pwm signal to map a whole curve.

To make it simpler, I would like one that I can connect too my stator to and test it that way. Maybe it's time for the Wizard at WMH racing to build one. Andrew, are you listening?

Lower IR in the stator coils will energize the stator faster and allow more current in rush this will create a stronger magnetic field. We already have the tools to measure IR, and it is going to be a much more reliable measurement technique. Something like the VICI 480c+ is on the cheaper side, especially from Ali and while its accuracy is not perfect it is repeatable. One of the big factors for measuring IR however is the temperature of the stator. Copper temp coefficient is awful, for a 17.5 or 21.5 for every change in 1 degree °C equals about a 0.1mΩ change in resistance.

But the amount of metal, the kind of metal, the volume (dimensions), slots etc of the stator has an influence on the generated magnetic field and I think the frequency has also some influence.

For frequency response and overall make of the stator I would use an LCR meter to measure the inductance. DE-5000 is a pretty darn good one that can do a limited range of frequencies (1kHz and 10Khz are usable by our application), also it can measure IR of the stator as well.

Generally, a lower frequency means a higher inductance, higher inductance without increasing IR generally leads to more torque.

Fantom also has a product that can measure IR and inductance. I have never used it, but I know it is out there.

I have seen the IR meters, but like Roelof stated, it doesn't give the final results. Kinda like having the strongest rotor doesn't mean that motor will have the highest torque.

Please make something, Trillerian. I'm willing to use Roelof's money to pay however much you want for one.

I do not think an IR meter does give a right indication about the generated magnetism. Yes, the PWM frequency determines the induction resistance and with that the drawn current. And the amount of current does determine the strength of the magnetic field. But again, the shape and used metals of the stator will have an effect on the magnetic field as well.