Seeing as we don't yet have a brushless dyno, I figured I'd share how I made a dyno out of a Novak Sentry datalogger, a Fantom Aluminum Flywheel, a Tekin RS Pro, spektrum 3001 receiver and Sanwa Exzes radio.
The following equations are what I am using. If there are any errors, please do not hesitate to respond.
For all math, RPMs must be converted into Rad/s.
ex. 3713 RPM, W = 3713RPM (2pi Rad/1 revolution)(1min/60seconds) = 388.82 rad/s
Torque = I (moment of inertia) x a (angular acceleration in rad/s)
Moment of inertia I = 1/2*MR^2
power (kW) = (torque (N*M) *2pi*rpm)/60000
angular acceleration a = (W-Wo)/t, W must be in rad/s
The moment of inertia for the fantom flywheel is,
47.59E-6 calculated from the weight, 79g and diameter 69.42mm
The test below is only a proof of concept. The tests are not ideal because I didn't top off the battery first, and I didn't let the motor run long enough so I didn't see a max RPM. Plus, I need to get my girlfriend to make an excel spread sheet for me because I did all the math by hand. Also, I do not yet have the current sensor for the Sentry and that should be in by the end of the week.
The following is a Hacker 13.5 dynoed @ 5 degrees virtual timing boost on the RS Pro, and a 5200 mah LIPO battery.
