lake_flyer said:Just checking, normally your P2 shouldn't drop in altitude at all in GPS mode. In Atti it could drop slightly but should not be enough to alarm you.
N017RW said:There are a number of factors at play here aside from the known baro. altimeter issue(s) which must be considered.
They include: CG, o/a weight, wind, drag, available power, and most significantly the overall system capability.
The quad multi-rotor in as under-actuated system. It can move within 6 DoF (Degrees of Freedom) in free-space (forward/backward, up/down, left/right, pitch, yaw, and roll).
But... it only has only 4 DoF control inputs (the motors). Add to this the system loads and you can see there will be some trade-offs in performance at some level.
To achieve lateral flight some thrust must be vectored towards the horizontal. This reduces lift so the system must have 'headroom' or adequate dynamic range within its control inputs (the 4 motors) to compensate for the loss of lift while maintaining the desired forward speed (via pitch or roll). Additionally the accelerometers must be of sufficient quality and the sampling/filtering/etc. algorithms optimized. The Naza is one of the least expensive FCs currently out there so it may not perform as well as others out there or your expectations in all conditions.
You may try a bit of added vertical gain to increase the sensitivity of that axis but be sure to watch for other issues as oscillations or other induced altitude 'hold' variations.
captain said:Thanks for all the replies.
The local dealer had it, they flight tested it, said it was the main controller, they replaced it, they flight tested it, and said its flying fine.
Test flight #1 light winds maybe at the most 5mph it went up toilet bowled little and got slightly worse so I landed.
Test flight #2 tried taking off it tipped forward with out taking off and went on its side.
Test flight #3 tried taking off again it tipped backwards with out taking off and went on it side.
The dealers tech is meeting me at a field tomorrow I will keep you posted.
captain said:Okay I met with the dealer today we went to a park close to his business location, the tech flew it and it performed perfectly.
Conclusion was the main controller did fix the losing altitude problem. The location of my test flights after the main controller was replaced seemed to be the issue. When I did my test flights I was about 25 feet away from a 4 story building on one side and about 20 feet away from a three story home on the other side. Now in retrospect I do remember my satellite indication lock symbol going from 6 to 8 and blinking off and then reappearing.
Because it flew great in one location and not in the other I think my test location was the problem. At this point without more flying I think the replacement of the main controller corrected the problem.
Thanks to all that has participated!
Hughie said:captain said:Okay I met with the dealer today we went to a park close to his business location, the tech flew it and it performed perfectly.
Conclusion was the main controller did fix the losing altitude problem. The location of my test flights after the main controller was replaced seemed to be the issue. When I did my test flights I was about 25 feet away from a 4 story building on one side and about 20 feet away from a three story home on the other side. Now in retrospect I do remember my satellite indication lock symbol going from 6 to 8 and blinking off and then reappearing.
Because it flew great in one location and not in the other I think my test location was the problem. At this point without more flying I think the replacement of the main controller corrected the problem.
Thanks to all that has participated!
I am missing something. Why would losing satellites temporarily, affect your height ?
andI am missing something. Why would losing satellites temporarily, affect your height ?
These type of 'answers' are really not satisfying. Best to just say not sure unless you can repeat the experiment and get the same results again.My test flights were never over 6 feet high because of it wondering so much and intermittent sat lock I didn't fly forward to check altitude drop.
The dealer at the park had satellite lock of 14 satellites and it was very stable at 10 feet high and flew forward and reverse without altitude change so at this point I am not sure but I think the replacement of the main controller fixed the problem.
My test flights were never over 6 feet high because of it wondering so much and intermittent sat lock I didn't fly forward to check altitude drop.
The dealer at the park had satellite lock of 14 satellites and it was very stable at 10 feet high and flew forward and reverse without altitude change so at this point I considered the changing of the main controller fixed the problem.