I have used both the APM 2.6 and Pixhawk (fixed-wing aircraft), however, I seem to have had greater success with the APM. I would like to hear from those that have also had experience with both (used on fixed-wing aircraft) and see which one you feel is more reliable.
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We had one crash, which I believe was due to a receiver failure in manual mode and fail safes where not setup correctly, however, I saw a similar experience with another DIY Drones member and they believe it was something to do with the Pixhawk.
We have also had a couple of instances of erratic flight movements which resulted in the plane needed to be brought back by RTL. Once again, hate to blame the Pixhawk, but we never experienced such issues when using the APM 2.6.
Speaking of redundancy, is there already a way to use dual IMU/GPS/MAG's?
Dual IMU/GPS/MAG is up'n'running , and logging - not all he logic that decides when a sensor should be deemed as not reliable is there yet for some of those, you'd need to read up on release notes on the type of UAV you want to use.
err, both run the same code, one run on NuttX , and is able of EKF - but I cannot imagine what "reliability" you might miss in Pixhawk.
Anyway - just use what works best for you.
On the other hand, Pixhawk have internal selection between power sources, and have/will have redundancy for IMU/GPS/MAG.