Originally Posted by Bry195

there is a linear relationship between current and torque if the timing is correct. the sky rc does not look at timing in a way that allows correct the timing errors when it in your RC. it does a good job of telling you the physical relationship between the sensors and the rotor. it does not help you correct the timing corrections that need to be made as the magnet fields distort as torque and rpm increase.

lets look at this from the opposite side of the logic. Your motor can be efficient (heat to power ratio) or very powerful (torques per rpms). it can never be both at the same time but you can manipulate timing to do 3 things. it can be neither powerful or efficient. it can be one or the other and everything in between.

in terms of how we apply this in onroad. Powerful means you can have a higher frequency of accelerations or higher amplitude of acceleration at the expense of how long you can do it for. efficiency means you sacrifice a little frequency or amplitude of the car to be able to extend the duration you can run the RC for.

A motor dyno can help you calculate the timing plus timing distortions that get you peak power or efficiency. a chassis dyno allows you to measure the influence the mechanical system of the car has on the motor and also include the ability to understand the previous sentence. You still cannot get an understanding of duration with a chassis dyno just efficiency and peaks are possible the same as a motor dyno. All previous comments about a dyno were specifically about an inertia dyno.

A load dyno will help you understand the previous paragraph plus duration (heat).

Lets go back to the beginning. torque and current are linear or to simplify lets say equal if your distortions (timing) are accounted for. the sky rc only tells you the relationship between the sensors and the rotor. the number that the manufacturer provides is an average torque/rpm that they calculated so that the sky rc does something more than just the sensor relationship. its a number that they decided was somewhere below the duration curve (continuous duty). this number has real torque curve for peak and continuous data behind it. behind that is efficiency, heat, frequency, amplitude, and a massive amount of assumptions about ESC efficiency and mechanical load (which also includes the influence the track has on the motor).

this is why the number they give you may or may not be good to use in the sky rc. we dont race in a lab but the number is usually very robust. it takes into account a range of all of these things. it may get you all the results you can feel or measure but its rarely perfect. that is why its considered a starting point.