Mira
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Skywalker x8 weaving during flight in AUTO mode

Started this discussion. Last reply by Graham Dyer Mar 17. 15 Replies

Hi guys,I have problem with navigation of my Skywalker x8 in AUTO mode. As you see on the picture below, the plane cant fly straight between waypoints and also makes unnecessary turnings. I am using…Continue

Tags: navigation, tuning, x8, skywalker, missionplanner

 

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Moderator
Graham Dyer replied to Mira's discussion Skywalker x8 weaving during flight in AUTO mode
"Your RLL2SRV_I and PTCH2SRV_I seem quite low, is this after autotune? Way back I used RLL2SRV_P = 1.4 and RLL2SRV_I = 0.3 on an X8 I tested with. NAVL1_PERIOD was 20 and NAVL1_DAMPING 0.75 with max roll at 45° This was 60km of flight in…"
Mar 17
andresiko replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Hi Mira, Did that X8 ever flown straight? Is the Board firmly attached to the plane? may it have vibrations? Have that X8 been tuned via Autotune flight mode? Hope we can solve this!"
Mar 14
Chris Lovett replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"I would study your GPS signal, and all the error/noise values.  I have found that mounting the GPS high up and away from all other electronics & motors can radically improve the GPS signal, and adding a grounded copper tape insulator…"
Mar 13

Moderator
Dwgsparky replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"I cannot get at any logs until much later today..,  The easy way to see this issue is in manual control, The X8 flys well under RC control and if Adverse yaw is the problem then when the aircraft is in level flight and you command a medium…"
Mar 13
Anto6ka replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Here is a screenshot with WPs and the worst flight with NAVL1_PERIOD 19"
Mar 13
Mira replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Hello DwgSparky, First, thank you for your reply. Your post sounds reasonable because I did some elevon changes in the past. I will definitely try it tomorrow and let you know about our results. Could you please send me some of your logs using fixed…"
Mar 13
Anto6ka replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Mechanically the plane is just fine. I am not using STALL PREVENTION because it wasn't allowing for good AUTO takeoffs from the catapult. Analyzing today's logs seems like the answer to my issues are indeed STALL PREVENTION algorythms. I…"
Mar 13

Moderator
Dwgsparky replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"This may be a mechanical issue? does the aircraft fly OK in stabilize?  or is it hesitant to turn ? I have seen a similar example of this with a flying wing where the down going Elevon in a turn was causing the aircraft to Yaw in the wrong…"
Mar 13
Mira replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Hello Anton, thank you for your reply! Do you also have a screen with waypoints? Btw. did you try to turn STALL PREVENTION back ON? You also mentioned that only one of your planes does that. Other planes works fine for you with same navigation…"
Mar 13
Anto6ka replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Here is a direct comparison of same almost square mission with different NAVL1_PERIOD values."
Mar 13
Anto6ka replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Hi Mira,  tested another GPS/COMPASS unit, same result. Went lower on NAVL1_PERIOD from 20 to 19 and the effect only got worse. Couldn't continue tests due to strong winds, tomorrow will be testing going higher on NAVL1_PERIOD. My…"
Mar 13
Mira replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
Mar 13
Mira replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Hello Anton, glad to hear that somebody try to solve the same problem. I still believe that it is caused by some wrong navigation parameters. We will be testing new methods tomorrow. If we don't fix it, we will probably try to connect new…"
Mar 13
Anto6ka replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"Hi, can you please check this log, too? Have almost same behaviour on one of my flying wings. Weird enough it was flying well before. The only difference is that I have switched off STALL PREVENTION. Just in case, I have replaced the GPS/COMPASS…"
Mar 12
iskess replied to Mira's discussion Skywalker x8 waveing during flight in AUTO mode
"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."
Mar 12
Mira posted a discussion

Skywalker x8 waveing during flight in AUTO mode

Hi guys,I have problem with navigation of my Skywalker x8 in AUTO mode. As you see on the picture below, the plane cant fly straight between waypoints and also makes unnecessary turnings. I am using mission planner ver. 1.3.44.First I tought the problem is with navigation tuning and tried to change…See More
Mar 12

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