So I am trying to get the autopilot on the APM2 board to fly my rc plane and have thus far only been able to crash it.
Manual mode works fine, but whenever the APM2 chip is requires, it seems as if the plane just spirals downward (not like a failsafe, but like a crash). We have done much debugging, and upgrading and following what is going on in these forums, but have been unsuccessful in making this plane work.
I am now wondering whether or not I need a new type of plane, because this EasyStar model does not have aelerons. I have noticed in the code where both the aelerons and the rudder are used to stabilize the plane, and I figured since I do not have aelerons, then this could be a problem...
Is there any version of ArduPilot that allows a plane to go into autopilot mode with just a rudder, throttle, and an elevator? Or maybe I'm just doing something else wrong. Any thoughts are welcome.
setup: Multiplex EasyStar
APM2 Board 2560 Mega
Do you use the correct channel? IIRC, for a 3-channel plane with only rudder one is supposed to connect the rudder servo to the aileron channel (was it the first output? better check the manual). Have been using a 3-channel EZ myself for a while and had no problems with levelling.
Thank you for the reply. I had not thought of that, but it seems like it could work for us. Will be testing the plane tomorrow with a whole array of possible fixes.
Have you ever tried it with the rudder output going to the rudder servo and no aielerons (sp?)?
No, I haven't tried that. But I believe that earlier versions of ArduPlane didn't even make use of the rudder but I may be mistaken. The last time I was flying the EZ with APM was some time last year. Now actually switched to a Multiplex FunCub which does have ailerons.
On the ground it seems as if the control surfaces are working correctly, however, the rudder hardly moves, although it moves in the right direction.
When I swap the rudder servo to the aileron output, the rudder moves much much more.
When I was running eagle tree on only 3 channels I would get the death spiral so I did the mod and it helped on the eagle tree, but have only used the APM with ailerons so I can't help there. Here is a good guide for the easy* ailerons and they are great:).