Incorrect motors RPM at arming and progressive throttle (3" quadrotor)

[cramredan1]

I recently swapped from Ardupilot to iNav8.0 on a 3" quad with minimal configuration (only baro, imu, accelerometer & compass enabled) and got a strange engine rotation behavior when arming and slowly increasing throttle...

I don't use modes at this stage, and they are all disabled, even Angle disabled at arming. Test running on the bench without props.
In short, the RPM ramping is not following the throttle input + returning to Idle leaves the engine running at too high an RPM.

These are the results of my tests, obtained with a tachometer on the bench. All 4 motors follow roughly the same RPMs

@idle (Arming) > 997µs > 850 RPM (ok for me)
@very SMALL THROTTLE INPUT > 1010 µs > 16,000 RPM (incorrect - Why so high a rotation @ as low as 1010 µs)
@mid THROTTLE > 1500 µs > 28,000 RPM (ok for me)
@Full THROTTLE > 2000 µs > 41,000 RPM (ok for me)

Also, returning to IDLE leaves the engines at around 16,000 RPM, and not returning to 850 RPM as they should.
Did I miss something??

Just in case, my diff is INAV_8.0.0_cli_LUCKYSTRIKE_20250224_123415.txt.

[MrD-RC]

It just sounds like airmode ramping up to me. Perfectly normal. The quad is trying to stabilise but can't, so tries harder.

[cramredan1]

But... there's no AirMode enabled, and motors stay at 16,000 RPM when throttle is back to Idle level. Does that still seem right to you? Marc Nader 06 15 07 64 54 Le lun. 24 févr. 2025 à 15:59, Darren Lines ***@***.***> a écrit :

…

It just sounds like airmode ramping up to me. Perfectly normal. The quad is trying to stabilise but can't, so tries harder. — Reply to this email directly, view it on GitHub <#10721 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATNFOVRHQLD7MA4PZBWPZK32RMXT5AVCNFSM6AAAAABXXZ2CK2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMZQGE4DIMA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[MrD-RC]

Airmode is not disabled in your diff. So it is enabled, as it is enabled by default. So this sounds normal.