When flying in the frosty weather condition, did you notice that PIDs need to be adjusted?
I was flying at around -2C and quad was actually drifting away like it needed more I gain.

MAN IM GLAD YOU ASKED! I thought it was just me..
I flew yesterday near sunset and it was a good 30 degrees Fahrenheit.. I noticed drifting as well. I will say though I looked at my black box data and there was slight stick input but I was almost sure it wasn't me.. I trimmed up my Taranis as good as I could after the flights and am going to try again later today. I was also thinking it could be because my hands were cold and starting to get numb that I didn't notice me putting in a small amount of input.

I just experienced that today. I think it's Roll for me. More prominent if I drop down at an angle then throttle up. Overall the quad feels a more loose today. Must have been -1C this morning when flying about guess the cold air through quad makes it even colder.

The batteries have a greatly weakened output at these temperatures, so your PID corrections are also weaker. Just keep in mind that the batteries will be more prone to damage in that weather too.. over-discharge will be even more deadly to the cells than in warm weather.

In cold weather the air is more dense. So it should be the other way around. In this case, it could be user input or the batteries not performing as good because of the cold weather.

Yes lipos do not like those cold temps. With my RC trucks running in the snow i keep batterys @ normal temp in my car or in the house. (An insulated lunchbox with a small hand warmer wraped in a small towel works great if there is no other way and your out in the field)
In my experiences also, lipos perform better when slightly "warmed up" so to speak. I usually do a warm up lap before i really start pushing the system.

As for cold air. It is much more dense and therefore your props are going to be grabbing more traction in colder weather than nice spring and summer days, also similar effects when there is a lot of humidity in the air vs dry air days. Think thicker mediums

(21-Jan-2017, 01:04 AM)Drone0fPrey Wrote: Yes lipos do not like those cold temps. With my RC trucks running in the snow i keep batterys @ normal temp in my car or in the house. (An insulated lunchbox with a small hand warmer wraped in a small towel works great if there is no other way and your out in the field)
In my experiences also, lipos perform better when slightly "warmed up" so to speak. I usually do a warm up lap before i really start pushing the system.

As for cold air. It is much more dense and therefore your props are going to be grabbing more traction in colder weather than nice spring and summer days, also similar effects when there is a lot of humidity in the air vs dry air days. Think thicker mediums

Actually, humid air is less dense than dry air.  There was a mantra I was taught as a student pilot: "High, Hot, Humid increases stall speed".

Oops had that backwards. Tyvm scotty! Water vapor is lighter than oxygen and nitrogen