Comment by Drone Savant on September 19, 2012 at 10:03am

It reminds me a bit of the "Worst Crash ever" thread. I mentioned an experience that I had with bad gyros in this reply to that thread http://www.diydrones.com/xn/detail/705844:Comment:972235. 

Your HUD looks very similar to the behavior I was experiencing on an APM1 http://tinypic.com/player.php?v=2edr3pt&s=7

These comments from Jason may also give you some insight. http://www.diydrones.com/xn/detail/705844:Comment:973561 Which build were you flying? Have the logs by chance? 

Stop flying near the highway bro!  

Comment by Trent at MyGeekShow on September 19, 2012 at 10:38am

Thank you for the links/insights. I did notice that once the prop was turned off and it was gliding, the HUD seemed to return to normal, i.e. it is a possibility that the resonance and the sample rate of the electronics could be matching/interfering. I'll get it back up in the air and see if I can repeat it and then cut the throttle at a good altitude and glide to see if it will return to normal.

Developer Comment by R_Lefebvre on September 19, 2012 at 10:49am

Huh.  "Leans" on an airplane?  That is the copter-speak term for vibration aliasing, which is what you are referring to as matching/interfering.  

I've never seen it go right upside-down though!

Also, the arduplane code uses the GPS to help keep things right-side-up, and so it shouldn't be possible for it to go that wrong?  Are you running a one-bladed prop by chance? (ie: paint-shaker)

I have used the APM on an airplane with a bug thumping 4-stroke motor, so I wouldn't think things could go this wrong on an electric.

Comment by Hein du Plessis on September 19, 2012 at 11:21am

Hi Trent I had exactly the same symptoms! Fortunately (unfortunately?) it went away as soon as it appeared. It started right after I moved the APM from the lower fuse area of my Skywalker to the top section under the wing. I believe some wiring could have had some pressure on it, but I'm not sure how to explain the behaviour.

The APM Planner showed slow rolls and dives and pitches while on the ground! Here's my post: http://www.diydrones.com/forum/topics/arduplane-convinced-of-doing-...

Comment by Veikko Vierola on September 19, 2012 at 12:14pm

Trent,

What kind of parameter setup do you use on the 3dr radios?

Developer Comment by Andrew Tridgell on September 19, 2012 at 1:52pm

Hi Trent,

I think I've mentioned this to you before, but basically without a telemetry log I can't help you. Without a tlog people can make guesses, or sympathise, but they can't actually diagnose the problem.

So please, post your tlogs. Along with the log provide a detailed description of what you saw, and what you expected to see.

Cheers, Tridge

Comment by Trent at MyGeekShow on September 19, 2012 at 1:57pm

R_Lefebvre: Sounds exactly what I'm seeing (leans). Bad enough to flip it over? Crazy... Using a standard 2 blade 8x6 prop. Glad to hear your big motor didn't mess it up. Which would be a higher RPM do you think? A standard Gas or Electric motor?

 

Hein: Thank you for your help! I may look at interfearance as well as moisture, only time will tell as I continue using it.

 

Veikko: I have it totally standard. Took it out of the box and flew it! :)

 

Tridge: Posting soon... Reason I didn't post this time is that I swear the tlog chart tool on the last 2 or 3 planners doesn't work for me anymore... even on old logs. I'll post it and see if you can see anything. Thanks!

Comment by Trent at MyGeekShow on September 19, 2012 at 2:12pm

I'm sorry, I'm trying to figure out how to post the logs? I don't see a button to upload a file from my hard drive...

Comment by Veikko Vierola on September 19, 2012 at 2:25pm

What kind of range have u managed to achieve with 3dr radio standard params?

Developer Comment by R_Lefebvre on September 19, 2012 at 2:28pm

Trent, I should have mentioned, I did have some rudimentary vibration damping on the APM in my airplane.  It still shook, but it worked.  I think the RPM is ~10,000 IIRC?  It's been a long time....  I couldn't even guess what your electric motor is turning.

Check the motor bearings.  Whenever I get a bad "leans" in my helicopter, it's been bearings that are going out.

I can't understand how "leans" could possibly invert the AHRS however.  That just doens't make sense.  I wouldn't think it could go much past 45°, and certainly that's the worst I've ever seen.

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