MOT_THST_EXPO testing/validation

[Christos_Pliakos (C.P)]

Greetings,

I would like to design/create a test bench and experiment with different mot_thst_expo values. Does the “motor testing” feature of the mission planner uses this parameter or it just sends PWM according to the percentage value that I setup? If not, should I use a STABILIZE flight mode in order to test my motors? Since I can test only one motor (huge propellers) is this a valid way of doing it?

Thanks

[amilcarlucas]

No. Any measurements of mot expo with stabalize mode are invalid.

You need to use motor test freature for that

This a thread on this forum explaining how to build a DIY motor test stand, including firmware

[xfacta (Shawn)]

ArduPilot Thrust Stand

[image] About the Project This is a fun project that I have been working on, for the past few months, that I would like to share with everyone. I have been designing a suite of tools to help members of the community make a more informed decision around powertrain selection and to assist in capturing thrust expo data for tuning copters and such. Central to these tools is an ArduPilot based thrust stand. This thrust stand has the following features: Logging: Throttle, thrust, torque, voltage…

Using "measured" MOT_THST_EXPO: What improvement can one expect?

Hey let’s assume one has measured the motor thrust curve and thus can determine a more accurate value for MOT_THST_EXPO, than the default of 0.65. Theoretically this should improve control and thus the copter behavior. What I’d like to understand better, since I lack the experience/knowledge: How much of a positive effect can one expect in practice? If there is any significant effect, how could one actually validate/demonstrate the positive effect, in some objective manner? Thx, Olli