I've got a bixler and have installed an APM1.4 with v2.40, GPS, magnetometer, xbee and everything is working great but in stable mode it climbs at like a 20 degree angle. In manual it's ok. I'm sure this is because when I did the manual level (I'm not using the auto level at each boot) I just put it on the ground and made sure the wings were level but apparently the pitch is not level by just sitting it on level ground.
How should I level it before pressing the leveling command in the planner? It seems I would need to raise the tail up about an inch off the ground but is that normally necessary? I know the elevator trim is ok because in manual mode it's all trimmed out but when I switch to stable it thinks it's pitched down so gives some up elevator.
So what is the proper way to find the level point?
No definitely not :) It's right under the wing on the bottom. Actually centered around the COG. Today I'm going to do some more tests but I never imagined it would be this complicated to balance the bixler. My skywalker never had this difficulty. At first I thought it was happening because it was leveled wrong in APM but now I'm just flying in manual mode and having the same problem. Maybe the spars is no the correct balance point? I know there are several ideas of what the balance point is like 60mm to 70mm ±.
Does anyone know of a site showing the basics of balancing a plane?
I have experienced the same leveling problems on a 8' Telemaster. Today I hope to try something new. And that is to use the HUD. Flying along in manual with the plane trimmed out for level observe the horizon ball and see how many degrees it is off level. Land, Set the plane on a table and reproduce the artificial horizon of the hud. Change to the config menu and hit the level button. Hopefully I will get out to try this soon.
I had the same issue with my Bixler and it turned out that I had my elevator dip switch reversed (how to reverse DIP switch), so when the plane was tail heavy, the APM1 would try to correct with up elevator and would make the pitch wosre. I now check the control services prior to every flight (how to ground calibrate) by going into stabilize mode and putting the plane in a nose down postion. The elevator should move to raise the nose up.
Hope this helps.