As specified on the APM Copter Wiki I did a vibration analysis and there is my log attached on a skydrive link
I have an official 3DR APM 2.6 on a F450 framewith Turnigy 2830 outrunner 1000 kv motors on 3s lipo.
I put 2 layer of neopren foam under my APM board.
As I see 3 bad spike , all other seems good and I want your feedback on it. Why I have theses spikes ?
Thanks for your input !