TimT. had some more AM/Sponsor training pix that talked of speedlining. The technique here tends to impact lines less than standard speedlining, but not as strong in that category as TimT. presents in Return to Beneath the Planet of TrainingPix Strikes back, part II produced by TimT. (how is that vid?)
A technique /strategy we find sometimes as maximum involves a slack speedline too to start. Either alone or in tandem with another support line. Instead of above, place speedline below or to side. That could shock speedline if ya just cut load and drop load onto speedline. But, we take the slack speed line and while cutting backcut, and use speedline to '2/1' presurre on the load and flex it over on more hinge, or pull it around, so that at the end the speedline is tensed in the process, the load can hinge down slower, as the line pretightens. Setting this rig on a 45 degree branch let's say. You can tie off speedline below cut 5' or so. Run, line up limb, attatch 5' plus above facecut, attatch. Voila, 2/1 - angle, flexing load down slowly. The 2/1 is maximized, when the angle between both lines is closed, so speedline is pulled back under the climber, so giving a fresh direction in that to some too. It can help flex hinge to side too. This can be with speedline only, or as power assist/more support, direction for other rigging applied to load in tandem. Sometimes we let the load slide down on speed line, on top of the line, straddling it at points (karab as link, as pulley might tangle moss, libs etc. and hang). thios gives spread out load on line and self braking action, for smaller stuff only i think. Sometimes no karab, jsut very positive bottom weight in inverted, straddling 'Y', and a clear path.
This is another one that as the weight comes off the host limb, it is set back onto the host limb/support at a lower leveraged position against the support, in a self catching format (but moving load to lower leverage pull on support than 'typical' block and catch on host/patient arraaingement). Also the host support limb has less leveraged pull on it, making it more secure for support that way too. For it doesn't have the load wieght on it at as high a position, so less leverage on supports parent connection, just by the connection point choice being closer to parent connection support, but the 'attitude' of the load is now just hanging from this less leveraged position against the support. When before the 'attitude' lean, increased the load's force beyond just it's stagnant hanging weight due to it's attitude/lean expressing that weight in a leveraged way, againsst what ever leveraged attatchment point of load has against it's parent support.
Pole saw is also good for placing extended leveraged push or pull on a about to fold hinge to get it to fold with more fibre. At precipe near failure of hinge from the ensuing march of the backcut, one can cause fold, failure by removing more support (backcut further), or increasing load temporarily. Increasing the load temporarily preserves more fibre, for more supported sweep thru the arc of the hinge (dictated by clean faces and angle of there intersection in face, to a focal point of the outer corners of the hinge, balancing the leveraged holding wood to contradict pulls across hinge's face, rather than with it's flow.) Or something like that........ Forcing the right hinge to fholde with more fibre, into the proper face can accentuate, and make more positive the hinge's dictated characteristics. Sometimes that support through sweep is all that is needed to make a world of diffrence, for hinging is slow, deto-nation is quick! The hinge is the moving machine you are building to this task, that makes it most important,and you in charge of it, on site. Slowly steered force on it is the way to go, unless you need all of that force for something (popping a top, slamming a dutchman, braking through flexing branches not to get hung up etc.). Then if you can get that s.o.b. to set it's own support line tension to it's own precise specification........