Effects of wind and how to improve stability

[robshaw]

Hi guys,

Ive been out flying today at Southend-on-Sea beach.  Things went ok but there was what I would call the occasional gust of a breeze.  I would say less than 5mph. Hardly anything.  Ive been noticing my quad is affected pretty badly by any slight breeze and starts to move a bit unpredictably. I have noticed this in stabilise mode as well as loiter and alt hold.

What PIDs should I be looking to change to try to improve this, and in particular the stabilise stability?

Thanks

Rob

[dfidalgo]

Same problem here, I would to know too.

[firey1]

P= gives you overall stability
D= how fast it reacts to change
I=how fast it corrects sensor errors

So to improve wind movement you increase your D to just below oscilation then increase P to just below oscilation
With the (I ) you have to be careful with as too much and the craft will go crazy trying to keep up with the fast change in error computing
overall its a very fine balance between all three PID to make a stabilised craft  for all weather conditions but you will never fully combat wind gust
but your ideal aim is to  make your craft as fast as possible to react to changing outside factors affecting it

The other option is to have two files one for calm flying and one for windy days and load appropriate for the conditions

[peter_a]

I asked the same question today :-

http://www.multi-rotor.co.uk/index.php?topic=2699.msg21521;topicseen#new

I`ve tried just lowering rate P and it then gets sloppy.

So if I have you right  :-

I lower rate P and rate I , and increase rate I until it start to oscillate then slowly back it off until it stops , then increase rate P until it start to oscillate then slowly back it off until it stops.

Is this wind free or in the a slight wind ?

[firey1]

lowering P rate will make it worse as you are wanting the craft to react more quickly to the change not slow it down

You can never have a setup that will be ideal for all wind conditions unless you have multi setups for different wind strength days

the best bet is to pick a normal day you like to fly in depending on your location

From your stock settings
first increase D rate up till oscillation then back off a bit
increase P rate till osscillation then back off a bit
Increasing I rate can help but this creates other issues if to high but helps with computing error for movement from gusts

And you will always get a height movement in gusts as this creates a high or  low air pressure over the baro

Bit like riding a motorbike constant wind you know its there and lean into it to compensate (P&D)
gusts catch you out and are slower to react (I)