Hi all,
Getting a bit confused here - been zooming around on alt hold to work on some basic flying skills, but I'm finding that during the flight, it starts to creep up.
When it does this, I tend to get it steady then flick onto Land, and then it rockets up even further. I flick back to stabilize to return it manually, and I appear locked out - "land" appears to be running, and I remain "locked" out, until I go over to the machine and press reset.
Another time, it's flying along ok on alt hold, and when I flicked land, it just fell round out the sky. Luckily i was above soft ground at the time.
In perhaps related news: I'm finding it very sensitive, and it does tend to wobble a bit, even on small inputs. I've got MN3508-29's and 1450 props on, powered by 2 x 4000mAh 6S. The APM is powered by the 3DR module, which itself is powered by a 600mAh 2S.
I have attached my logs in case anyone can spot anything.
The "climbing" flight starts at 8% through, the climbing starts at 24%, and the land program kicks in at 35%.
Any tips from people who also had this problem?
Replies
Ok, as way of an update, I have had my first "perfect" night - no loss of control incidents, and no crashes!
I made 3 simple changes:
- Reduced the Angular Rate roll to 0.090, as per the recommendation for big engines (I'm using MN3508-29 - 380kv on 14.50 props on a 3kg vehicle)
- Calibrated the accelerometers
- Ramped down the alt hold by 30%
Rule of thumb - don't make too many changes at once!
It now flies properly! It doesn't wobble as much (there's a tiny one there still, but you have to be standing 2ft away to see it), I can actually land the thing (though the throttle is still very sensitive), I can fling it about a bit (well, as much as a newbie can!), and the climb rate is frankly ridiculous on full throttle with these props and motors. All the programs worked without failing, and I've learned to use the throttle to adjust my alt hold height.
If anything I will revert the alt hold back to normal settings: it loses a fair bit of altitude when moving forward - to the point you have to lift off or hit the ground.
Next - some log analysis for vibes - though it's flying really stable at the moment.
God it feels good to come home without having broken something...:-)
I should add, the APM is suspended on a DJI platform, with rubber risers, and the APM itself, along with the receiver and 3DR radios are all individual moongelled.
However...I have not balanced my props! having said that, it does loiter very nicely (if a little squirrelly):
https://www.youtube.com/watch?v=N5HcM277nhc