SRT ground anchor vs cinched to limbs

[Maui Palm & Tree Care]

i know there are certain applications for each but what method generates the most weight on the TIP. i heard somewhere here that ground anchors cause more force to be generated on the TIP?

 

[Jesse]

If you send up a running bowline you are not doubling the forces on the tip. When anchoring at the ground you are doubling the load at the tip.

 

[JeffL]

And if you ground anchored a single rope and hung a ddrt off it, you're quadrupling the load!

 

[tophopper]

incorrect

 

[tophopper]

If you self belay your ddrt (as most do) it would be the same load as each leg of the ddrt supports half your weight. If you ground anchored your ddrt ontop of the ground anchored srt, then you would quadruple the load.

 

[Maui Palm & Tree Care]

so does the force of the "secret weapon" with ground anchor double the load or quad?

 

[moss]

[ QUOTE ]
so does the force of the "secret weapon" with ground anchor double the load or quad?

[/ QUOTE ]

Doubled
-AJ

 

[Tom Dunlap]

The load multipliers that were using here are all theoretically correct

In practice there are ways to reduce the load onthe tip. Adding friction into a ground anchor system will reduce the load. Using a more dynamic rope makes a big difference. Ascending smoothly too instead of bouncing up On static line is better.

Intuition tells me that a rough frog/rope walker ascent is netter than a smooth footlock.

 

[JeffL]

Whoops, that's right! I was thinking back to a rigging demo where a remote pulley was set, and then a load taken on the line on the pulley, held with a portawrap, hence the second ground anchor. My mistake!

 

[Mark Chisholm]

Yeah, you would be right there Jeff. Math can play tricks on you.