Hi all,

   after changing motors and ESCs I'm experiencing strange behaviours whith loos of control of the quad.

Today I was able to track strange altitude readings both on Baometer and Sonar, see attached picture and log:

2012-11-25%2020-41%204.log

Initially I thought it was a defective or interfered sonar but look at the spikes both sonar and barometer goes high, sometimes also at the same time!

Attitude of the copter was, in this cases to climb very fast if in alt-hold or in loiter. 

I also experienced a flip picture below).. with no damage fortunately.

2012-11-25%2020-39%203.log

Any suggestion?

Thank You,

       enrico