My Iris has always seemed to have a tendency to tip onto its nose at take-off.
I have my GoPro Hero3+ Black in a case on the front and have selected the Iris with Front GoPro parameter file in APM 2.0 on my Macbook.
I had the “hotfix” kit from 3DR and did a compass calibration, RC calibration, ESC calibration and gyro calibration. The HUD appears to be responding as expected.
I am running ArduCopter 3.1.5 with the V hull.
If I try and take-off in Stabilize - instant nose dive forwards.
If I try Alt-Hold it just about makes it off the ground, although still tipping forward, but is incredibly unstable in the air - to the point of nose diving into the ground - thankfully long grass, so no damage… yet.
Any ideas what is wrong with my Iris?