Vibration on P4P

[The Real Tinman]

I’ve noticed recently that my P4P seems to shudder/vibrate during motor shutdown upon landing. In other words, as the motor RPMs decrease, there is a noticeable vibration of the entire AC while the props spin down to a stop. Is this normal? If not, Any ideas?

I have tried several props (all new all OEM) and the vibration persists.

Thanks for your thoughts!

 

[Deleted member 62848]

I’ve noticed recently that my P4P seems to shudder/vibrate during motor shutdown upon landing. In other words, as the motor RPMs decrease, there is a noticeable vibration of the entire AC while the props spin down to a stop. Is this normal? If not, Any ideas?

I have tried several props (all new all OEM) and the vibration persists.

Thanks for your thoughts!

IMU calibration for start,,then dig deeper if not fix,,ps,,props have to come off for this cause last step in calibration needs the drone upside down,,,,it's a series of pictures uou follow when all turned on,,goes on side etc ,,just follow what picture does when you have done one pic it will go to next,,,I think 8 from memory (8 step process) ,,this should sort out anything unusual unless it's internal,,

 

[Starz]

I’m thinking I’ve seen this issue somewhere. The reading that I saw some time ago mentioned a firmware issue. I’m not sure an imu cal is the cure.

 

[Starz]

Found this. I’ll keep looking.

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[Deleted member 62848]

Yes after watching that clip the opp could have a vps issue making this,,,,,
Mayby he should turn off OA and vps to eliminate this the cause

 

[Starz]

There was at some point quite a bit of discussion about the shaking at shutdown. I just can’t find it.

 

[Pinback66]

I had a very similar issue with a second hand P4P, I assumed I had a failing motor. I subsequently brought all software and firmware up to spec, prop changes etc and no improvement. I then flew it with my P4Adv prop guards and landing gear extenders/cross brace protector and problem went away immediately. Oddly, once removed the aircraft is now vibration free. I can only assume that there was a mis-aligned component in the airframe which the bracing effect of the landing gear corrected?