I know my PIDs are off on my BAT QX105 as when I go to launch into the air it is bouncing up and down.  I can't land it or take off smoothly. 

Is there a good video that shows what PID's for what symptoms?

Secondly which setting controls throttle it wants to rise at half throttle so I know my throttles are up too high should be stable at 50% from what I been reading.

Just starting to dig into tuning myself.  FWIW, this video is referenced in the cleanflight documention on PID tuning -

Bouncing on landing is pretty much normal, and it will be worse the more "locked-in" your quad is... It's because any contact with ground will cause some motors to counter-act, in order to keep attitude. Best tip is to hover as low as you can, then disarm and let it drop.
As for launching, pretty much the same... give it a quick throttle push to get in the air high enough to get out of ground effect.

The issue with hover point not being at 50% throttle stick... well that's another thing (and i wouldn't recommend it - imagine the high power/weight ratio, what you want to achieve would result in very little stick resolution for a large part of the available power).

Easiest would be to use throttle curves in the transmitter. The throttle curve in betaflight is not really functional yet (version 3.1.5 as i'm writing this). Throttle mid does nothing by itself, it's only an adjustment point for throttle expo. You can make it work if you set throttle mid to 0 or 1 and then use throttle expo to bend the curve.

But either way, hover point will wander anyway as battery power goes down... there's no compensation for that.

(19-Feb-2017, 04:07 AM)fftunes Wrote: Bouncing on landing is pretty much normal, and it will be worse the more "locked-in" your quad is... It's because any contact with ground will cause some motors to counter-act, in order to keep attitude. Best tip is to hover as low as you can, then disarm and let it drop.
As for launching, pretty much the same... give it a quick throttle push to get in the air high enough to get out of ground effect.

The issue with hover point not being at 50% throttle stick... well that's another thing (and i wouldn't recommend it - imagine the high power/weight ratio, what you want to achieve would result in very little stick resolution for a large part of the available power).

Easiest would be to use throttle curves in the transmitter. The throttle curve in betaflight is not really functional yet (version 3.1.5 as i'm writing this). Throttle mid does nothing by itself, it's only an adjustment point for throttle expo. You can make it work if you set throttle mid to 0 or 1 and then use throttle expo to bend the curve.

But either way, hover point will wander anyway as battery power goes down... there's no compensation for that.

Thanks.. that was the problem the expo I set it like you said to 1 and than with mid at 25 it's hovering pretty well.  before it was definitely not hovering at mid and kept rising making it very difficult to hover much better once I knew that mid throttle did not work without expo set to at least 1. With mid throttle being hover point it is helping me to learn to fly with this drone. I was able to hover it some in the house and move very little and once my caliper arrives Monday I'll get measurements done than sloscotty will make me some prop guards for it