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

[warp2 (Mat)]

Hi all
very interesting thread. Maybe I missed it but would it not make sense to have a table where everybody buts his measured/tested MOT_THST_EXPO values in with all the measurements?
I would be interested in the following setups:
7inch HQ triblade - 1800kV Xing -Holybro Tekko32 Metal F4
7inch HQ triblade - 1500kV Xing -Holybro Tekko32 Metal F4
T-Motor Carbon P18*6.1 - T-Motor Antigravity MN5008 KV340 - APD 80F3

[xfacta (Shawn)]

There is this discussion and there’s a table Tridge has to save the new data. I’m tracking it too, in case we can improve the motor thrust expo calculation in the Initial Parameters.
I think it’s on hold while some improvements are being made but I believe the script is totally safe to run, you just need quite some altitude.

Automatic MOT_THST_EXPO estimation lua script

[image] I’m after volunteers to test a new lua script which can automaticaly find the right MOT_THST_EXPO for a copter, saving the need to use a thrust stand setup. Finding the right expo for your motors/prop/ESC combination is an important part of getting a good tune for ArduPilot, but the only method we have had so far is to do a full thrust stand test, which is quite time consuming and thrust stands can be quite expensive, especially for coaxial propeller setups (on an X8 multirotor you ne…

[warp2 (Mat)]

Thanks Shawn
I saw that thread but thought its on hold. You think I could try the script with my overpowered 7"?
I will put ATC_THR_MIX_MAN to 0.2 to be on the safe side. Any other parameter to look at before running it?

[dkemxr (Dave)]

@warp2

You think I could try the script with my overpowered 7"?

I tried that on my 7" and at it’s current Rev level it maxed out the Expo value. Think you need to wait for further updates as you alluded to.

[Maeldd (Mael Donnard)]

For people looking for the value MOT_THST_EXPO for the P60-X Combo Pack X-Agricultural Type (Integrated Propulsion System）UAV Motor 170KV.

we did some tests :

X copter with oscillation around its diagonal

[correction] 0.4-0.3 is incorrect, the P60-X Combo Pack X-Agricultural Type (Integrated Propulsion System）UAV Motor 170KV seems to have a linear correction for the ESC [image] [image]