T - it was in the package...
Quite a time and place; though here i didn't see that timeless, simple advice of "Strong limbs and snug ropes!" in your sig-nature....
Lots of things change, even whom was first asked about all this in the very opening line of the ISA post below...
; Had to change to .txt file as .html(hyper text/internet pages) isn't a recognized attatchment type
But not the math, nor the consideration of how tight the line is as determinate (IMLHO) to leveraged pressure on the line; for the tightness is what allows the slack for the dip angle (that determines the leveraged load)?
Also, i believe we will find that a horizontal line 50' long pretightened to X #'s with 100# hung in center will have less dip than a line 100# long pretightened to the same X #'s tension witht he same 100# on it. Therefore, to maintain height needs more pretightening, more pressure?
In the
Fused Sling Thread ; The crane manuals (i posted links to)quote support angles/math for slings/lines to a load. This is the same math; bent line by so many degrees, anchored at ends; only a crane pulls up, and loaded speedline pulls down; but the same math of pressure on a bent line IMLHO. So, the same reason for not having a loaded super tight/straight horizontal line for speedline is the same reason not to have to flat an angle on supports of speedline, basket loads, straight legged slings loaded, spyder legs, hammer chokers closed etc. in lifting/lowering; the flat angle of the line under load leverages immense forces to the line/anchors. Theoretically approaching infinite in an absoulute flat horizontal line loaded well in the center (if i remeber write).
Thus,...... ever see a sidewards '8'?
This line leveraging (under load), as wee begin to realize it; can also be carried right into using on our side for tightening with Brion Toss's 'sweating in' of a line. For here too, is the same math, placing bend on the straight line leverages it for more tension. Sailors used this for centuries when a capstan winch handle was lost or broke for tightening their lines and lifting. Sweating lines in to remove 'play' is a fantastic, no tool, simple rigging strategy. On a ship, for hauling up a halyard quite a ways; and the work involved, prolly is how the technique earend it's name (plus water squeezes outta line); but on a short service of final tightening for our rigs; it is quite an quick, easy and intense final adjustment IMLHO; perhaps 'sweating in' gives wrong imagery for that..... "Tryyyyyyyyyyyyy it, you'llllllllllllllll like it! - No AlkaSeltzer needed!
Orrrrr something like that!
:alien:
edit; and a safety warning for dropping anything on a taut line between you and any friction on other end of line, let alone anchoring/ support.
Any problem with attatchment, try downloading and dropping the last 4 letters of the file name '.txt' so that the last 4 charachters (that determine file type) are '.htm'.
