This is a completely wiped firmware load by loading ArduPlane then 3.4.3 from MP.
That has begun to be my common practice to loading firmware.
This happens with the following flight modes:
Stabilize (delay in energized motors stopping from being energized)
RTL
Land
PosHold with zero throttle descent.
I see your video and that is exactly what I get.
However, I am now checking with the other group to see if they can link me the video of the shutdown I described.
Update - This is why I got PixHawks for my crafts but I do not see this landing behavior.
Motors shut off instantly on contact (listen to the motors de-energize on contact)
They still spin but they do not have power to them - mine do as seen in the previous video.
It’s not an ESC setup issue, but I do like to use the MOT_SPIN_ARMED and MOT_SPIN_MIN parameters to avoid “soft start” features in the ESCs. You have them zeroed. This is also why they start so late as you raise the throttle from bottom in STABILIZE.
This behavior is odd.
C3IN, THI, and THO are synchronized as expected. RCOUT 1 through 4 clearly are late to the game.
I also like to reduce my DISARM_DELAY from 10 to 5ish for auto landing/disarm. This will not influence the throttle issue you are seeing, it would just “idle” for less time on ground. The way you have the MOT parameters setup, you don’t even see the “idle” after arming, or before disarming.
After seeing your non-standard MOT setup, I think the previous suggestion to go back to stock parameters and bench test is warranted.
Minor testing with the following param changes:
MOT_SPIN_ARMED 0.16
MOT_SPIN_MIN 0.18
I do not like spin armed
with these settings, the other bounce effect is still there - where I increase motor speed quickly and reduce. It sounds like the motors are getting a double increase before reducing but the motors still have a delay increasing.
Not had a thorough look through the logs, but the motor delay when throttling looks normal to me. The slight extra ‘twitch’ of rpm I think is because the AP sees a none 0 pitch / roll attitude and is responding to that.
The auto land delay motor shut down looks as if the ‘am landed firmly on the ground’ test is un-sure the craft is on the ground. this will delay the motor off. I see a little spike in the baro pressure drop just after touch down @17942, this is telling the AP the altitude has just increased a little. this may well delay the motor off as the AP is not convinced the craft has landed. This may be due to ground effect and prop wash. the pressure from the props may be changing the pressure on the ground which the baro detects and the AP reads as a slight altitude increase causing this.
The ground effect is a physical thing not the setting. What I was trying to explain is the real air pressure changes when the copter is landed. this is perceived as a slight increase in altitude which the AP , if you like, ‘questions’ is the craft actually landed before I shut the motors down. I have seen this issue with copters with no or low landing gear as the pressure change is grater the closer the copter is to the ground.
I understand.
But again, this is with my 450, 550 and 680
Getting higher off the ground as the size increases.
However, my friends touch the ground and motors turn off instantly with the same setups.
Hi PM.Probably worth mentioning that my set up on the landing you recently posted was a bog standard stock 3.4.4 parameter set with the usual calibrations and nothing else.Taranis/X8R combo and a Pixhack 2.83.