Very good Safety point TC, something maybe assumed by some of us, but not all.........
Jump cuts take lots of practice, very much timing, still tricky.
Perhaps, a 'drop cut'(?) (weight, aren't they all drop cuts?
), where you make it drop straight down, and it does not kick back, then have groundies pull it just as it comes off, but timing once again, but can be done, especialy in that 1/2 second that ol'gravity doesn't know that the piece is a free agent (something at rest will tend to stay at rest........)
So undercut as much as possible, just a kerf cut as stated. Then cut into the sides in line with the kerf, eliminating even more fiber(less load on saw on final cut=faster available speed to less load of fibre to cut). Do this sidecutting after bottom cut so bottom cut doesn't start to fail and pinch saw. So, in this order u can walk it closer to failing with less problems of pinching saw on pre-cuts. You want piece to release all at once and drop straight down with nothing releasing last and pulling it back towards tree. It all instantaneously releases, and it will drop straight down, if it hinges at all, it will tend to try to throw in that direction, everything else being equal.
Then come down straight into that cut fast. A fast saw and all the fiber eliminated will maximize this speed, aidng an instantaneous release all at once. You can always slow a saw down by backing off trigger, but not always make it go faster. So with a fast saw, and a lot of fibre removed, you have maximum control of the widest band of speed possible available for guiding and deciding when and how to employ it. Taht speed can help in this instantaneous release, or in hinging limbs around, by speeding up and using that swinging force to your advantage when applicable, by speeding up cut and throwing the limb around on hinge with more force,a t least to start. You can always slow cut down, but unless you set yourself up right, you can't always speed it up, speed can hurt; but it can help, if ya know how to use it
Also for another tweak, come across slightly on final cut, so instead of feeding straight into gravity's power, the last piece of fiber pulls it sideways (even if not visibly) a percentage. It only has so much force, so any moving sideways is not moving down, or back! Will get even bigger pieces to drop straight with that!
So, if it will drop straight with no force kicking back by employing these techniques, and ground control can snatch it jsut as it cuts through, you should be able to get fairly positive 'pop' out away.
Practice in non-essential areas with all new techniques. Jump cutting out can be a real tough one, but dropping straight down, releasing immeditately all at once, should be a more standard skill to achieve, with more positive mechanix. And pulling it out with line just at release, might save some tears until you can get jumpcutting down (witch i steer away from, no not steer, like i'm not bull enough...........)
