ptlong wrote:
tomtom wrote:
majid_sabet wrote:
let's ask one of these math experts to see what they say so here is the problem;
Pig weight ; 65 lbs
Anchor ; 2 piece cam
Slack in the system 50 feet
Rope; 8.5 mm static
Rope Elongation; 3%
I put $10 that this pig will end up at the bottom of the base with a broken screamer.
This is a poorly-posed problem. Not enough information to compute.
No doubt, but a simple spring model estimate is illustrative. In that approximation the peak force is a function of pig weight, elongation, and fall factor. For majid's case it would be 660 kN or 150,000 lbs. Ouch! What would break first?
Don't drop the pig if you use a static line. Don't drop it. Don't drop it. Don't drop it. Don't drop it.
Adding a screamer would "mitigate" the force very little if the pig goes 50 feet.
If you're planning on dropping the pig use a dynamic haul line.
