I’ve been trying to get an Aero Scout fitted with a Pixhawk 1 and I’ve run into several problems along the way. I’ve been reading through the wiki, the forums, watching Painless 360 tutorials but am now running low on figuring out what exactly is going wrong.
I’m currently using:
Pixhawk1 remake from Flying Tech (2.4.8)
Ublox M8N GPS Module with Compass
Holybro Telemetry Radio (No apparent problems with so far)
FrSky 8XR (Links to FrSky X20 and works fine when we’re flying manual)
I get several problems on PreArm checks, usually to do with the GPS and/or Compass. We can fly manual mode well but then when we flip to FWBA it tries to dive to the ground. This is the link to the flight log, we tried flipping to FWBA three times until we nosed down to the ground on the third attempt and couldn’t save it.
I have a few ideas but if anyone can point out something obvious I’m missing, I’d be grateful. I think there are several problems happening in combination.
Flying well in MANUAL and doing wrong thing in assisted modes is a typical sign of double reversal of controls, you have to have correct response in FBWA on the ground before you start reverting RC.
If you’re able to fly in manual mode then I assume you’ve got experience with RC planes. So Ardupilot is a bit backwards to what you’re used to.
First: Put the RC controller away. You don’t need it yet.
Second: Get the control surfaces moving correctly for the FBWA corrections. Reverse servos as required to get the proper movements. When the nose goes up, the elevator should go down as it’s trying to return the plane to level.
Third: Now you can pull out the RC. Turn off the trims. Don’t use them in Ardupilot.
Fourth: Make sure the sticks move the controls as you expect in manual mode. Reverse in the transmitter OR on the RC settings (RCx_REVERSED) as needed. Don’t touch the servos at this point.