unstable hover

[dotan]

hi,
i have difficults keeping my belt cp in stable hover.
the problem is the heli go up or down, but is very hard to keep it hover, it's like jumping up and down very aggresive, without hover point. it's also does similar thing on the cyclic, but less.
it hovered fine until few days ago. i think the problem started when i replaced the stock Tx with airtronics rd8000.

the current curves (based on finless bob videos):

pitch curve:
p1: -1
p2: -0.5
p3: 0
p4: +4.5
p5: +9

throttle curve:
p1: 0%
p2: 32%
p3: 65%
p4: 82%
p5: 100%

cyclic range is 6 degrees on each channel.

i also noticed that i have a tracking problem, i reduced it and i think it was more stable (still out of track, but better), but the battery was weak at this stage, so it hard to tell.
can it be the tracking problem? or curves? maybe both?

[TheBum]

You might want to bump your throttle curve up a bit and let your collective control the lion's share of your vertical movement. The collective will respond more quickly than your throttle, so you'll be able to make finer and quicker adjustments. My Diablo's curve is 0-70-90-95-100.

[jgoodwin]

You will lose some left with a tracking issue, so it may well be that it does not respond as well as it should. When my heli is not tracking, then I get it tracking it feels so smooth.

-J

[dotan]

thank you both for the help.
i found the problem. one servo was for some reason slower than the other so when i gave it cyclic the collective changed also.