Dear all,
yesterday I went to fly with my new hexa (second flight session). At the flying field there were a 20/25 km/h wind. I decided to try to fly in stabilize mode and after some troubles in takin off I realized I was not able to control the hexa, I mean with pitch control full forward i was not able to contrast the wind...
The result is that i had to try an emergency landing 200 mt far from me, with low visibility.
Luckily not so great damage, 2 legs broken and one arm bended...all the rest looks working.
From here my questions:
- why I was not able to contrast a wind that i could not judge as really strong? the hexa was slipping away far from me and the higher it was the fast was slipping.
- if i was using RTL (I didn't have the time to use it) do you think the hexa could be able to go back home running against the wind that caused the problem?
-In such a wind (I'm living in Istanbul abd here it is always windy) can I trust to use the Auto mode/Loiter and RTL mode?
Do I have to rework the PID settings? any suggestions?
My purpose is to take aerial pictures so i will need to add 600 grams payload....which will be the impact?
I will post this evening my parameters and possibly the logs.
Thanks for your help.
Marco
Replies
thanks for your answer! I'm a newbie and getting a bit lost...or better feeling I have to build a lot of experience.
This evening I will upload the param file. I was supposed to do yesterday night, but honestly, after 2 hour in the traffic I was just willing to drink a cold beer ;-)
Parameters will arrive.
By the way, the frame is from jdrones, configuration + and the dry weight is around 1.8 kg .....(including camera mount). So full load, plus batteries and cameras (2) it will arrive to 3.1 kg ....
basing on propellers trust I must have enough power to fly.
What do you say?
Thanks
Marco
Yes, post your PID settings. What frame are you using (vendor or custom) and what's the dry weight (no battery)?
25km/hr is pretty much at the high limit for good aerial photography conditions, hence, if your PID settings (stab/rate/loiter/alt) are aggressive (high) it will overcome it on full stick actions and modes like RTL will work. But if your settings are soft (low) there's a chance it can drift away.
If you are happy with your rate PIDs (it hovers acceptably, and can be subjective...), then you need to increase your stab PIDs to allow higher pitch/roll angles to fight off wind (P terms for more sensitivity, I terms for more wind resistance). Auto modes will require more experimentation with rate, loiter and alt PIDs, but typically increasing I terms for wind compensation work.