Motors vibrate at certain RPM

[jevermeister]

Hi,
I have successfully flown a lot FPV with fine aerial footage.

But now I have asevere problem:

My motors are start vibrating like hell at certain RPMs (or when the props begin to pull)

I mounted the Gopro the battery plate and connected this with dampeners to the frame but I still have a bad rolling shutter .

I carefully balenced all props and replaced the propadapters with brand new ones. If I test the motors without props nothing is vibrating so the shafts seem to be ok...

Are the bearings broken or what can cause this problem?

I use eMAx CF2822 with 8" Propps and prop adapters.

Nils

[chris ables]

I had that same problem with gaui props because they where thin and flexable ! I changed to gemfan props and vibration and flexxing went away !

[jevermeister]

Okay,
I switched to 10" PRops on my front motors and the Wobble is gone - no rolling Shutter (motors are getting really hot again)

SO I think there is a resonance right at the RPM I need to hover for filming .

I guess this means, that the Motors are to weak to lift my copter with cam & 8" Props.

Nils

[Hamburger]

other brand 8" props maybe?
I remember 8" gws were horribly wobbly.