Hi Mark,
Attached is the data gathered.
The data is analized as
1. X-axis directs forward and Z-axis directs upward.
2. Throttle is increased from 40% to 70% at 280 sec.
3. Battery voltage supplied to the flight control computer(FCC) is decreased because of big current consumption. Even though, Volatage supplied to IMU is well regulated at 4.98V.
4. GPS upward velocity shows positive slope which means upward acceleration.
5. GPS altitude shows vehicle moving up.
6. X-accelerometer outputs positive value which indicates vehicle is accelerated forward.
7. Up to here, all phenomenons are matched with throttle up.
8. But Z-accelerometer outputs sustained +0.5g for 10sec which means constant downward acceleration because +1g is measured at level flight. The -0.5g acc. for 10sec means 50m/s up-velocity decrement! During that 10sec period, GPS up-velocity shows 5m/s up-velocity increment for first 5 second and then 5m/s up-velocity decrement for next 5 second. ==> velocity profile does not matched with acceleration output.
Best,
Ihnseok.
