"I still believe the answer is in the rudder. Just try trimming a ton of rudder in next time you fly the grid and I bet it will slide back onto the line."

"Here is an old thread on the topic:
https://discuss.ardupilot.org/t/flight-path-offset/3881
Unfortunately the others have long been deleted from the DIYDRONES. "

"Ay is what I use when graphing in real time using the Tuning window in MP. 
I’m not near a computer so I can’t tell you what to look for in the logs. Both logs should have accelerometer data. You are looking for lateral (side to side) acceleration. "

"How do you know that you don’t need rudder? The plane will fly in a straight line of the ailerons are compensating for the rudder. Check the lateral acceleration in the logs to be sure.   Bert said:
Hi,

Thanks for your suggestions 

At cruse speed…"

"I’ve seen this before, especially with the Skywalker. I suspect that your plane is flying in a slip due to the spiraling slipstream from the big pusher prop hitting the tail and creating a yaw.  You can see the plane flying in a slip (crooked) while…"

"The HUD? I don't know what clutter you are referring to. You mean the map? How about a screen shot?"

"No, Absolute Alt is above sea level. When you create a mission be certain to use Relative Alt, not Absolute. Relative Alt will automatically be set to Zero when you Arm the aircraft."

"Has anyone figured out a good way to map a vertical surface? Ideally we could use a lidar range finder to maintain a constant distance from the cliff wall."

"My guess is that your NAVL1_PERIOD is too high. Try lowering it incrementally. I think you'll end up somewhere between 15 and 18."

"Yes, it works just fine. That's what I do."

"A BEC is just another name for a voltage regulator. You will need an additional one whether you use the main battery or not."

"FBWB is the same as Cruise minus heading hold. Not good for landing. Use FBWA or Stabilize



M Awais said:So what do you will suggest if i say that i decided to use stabilize mode for takeoff, FBWB for flying (Due to its Altitude Hold properties)…"

"FBWA does not require an airspeed sensor. Please read the wiki."

"FBWA gives the best combination of control flexibility and protection."

"M Awais said:Is heading can be permanently locked in Cruise flight mode for a perfect landing purpose 




@M Awais, it's not a good idea to use Cruise mode for landing because you don't have good control. In Cruise mode throttle controls airspeed,…"