Chapter 10 Recovering Equipment, White Water Safety Instructional movie, for kayakers and canoeists.
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- เผยแพร่เมื่อ 18 ต.ค. 2024
- Chapter 10 Recovering Equipment examines many different approaches to recovering equipment, including options for simple mechanical advantage systems for small craft from White Water Safety with Bruce Jolliffe and Dougie Shannon is a concise instructional guide on safety and rescue methods suitable for white water kayakers and canoeists.
Beautiful minimalist setup. Had to convince myself it was actually 4:1. Thanks for the excellent video!
Hi team, love your series!
Regarding the "roving 4:1" system, it is fascinating that it works as there is no fixed attachment.
Why is the loop not just circulating through the biners?
Does this work with pulleys in the system?
Cheers.
Edit: Ah, have worked out the two lines at the anchor do not actually move ;) (effectively a fixed point with a biner for convenience).
If even one pulley placed in system it loses friction and the loop just runs through! That'd be embarrassing... :)
So, throw in a Munter/prusik at anchor pulley (line going directly to boat) to ensure no movement (although allowing re-set), and place pulleys on boat (if possible) and travelling biner, and this is really good :)
Even just one pulley makes a big dif.
Thanks for sharing.
Great question Fraser!
The answer re: 4:1 pulleys is yes, and it is very beneficial to do so with larger loads like canoes stuck in the river - but how you do it, depends on what you wish to accomplish.
Pop two pulleys on, one at each of the bends where you want the rope to travel (i.e. at the boat/object and at the bag end of the rope) and the point without a pulley (i.e. the anchor) will take the friction and the system works. However, it loses its roving / resetting capability under load because of the differences in friction.
Pop three pulleys on, one at each of the karabiners/bends and when you pull the system will not work *UNLESS* you grip the rope at the pulley nearest the anchor, i.e. offer an increase in friction. This is easy enough to do even if operating it on your on, we're talking 'pinch it with two fingers' as an amount of force required to create the required grip. I've tested this with a canoe full of water stuck in a river (not wrapped and folded, that would be a waste of a canoe!). The beauty of this version is it is still resettable - even under load.
Many folks still 'poo-poo' these ideas, however, I would urge any sceptics out there, or true believers, to get out and play with it. Don't be afraid to make mistakes and be willing to question why stuff does and doesn't perform - therein lies the quality learning.
Cheers for the response Bruce.
Yes, trial and error is how we learn.
This will be my go-to system!
Fascinating how providing a small amount of tension sees it working under big loads! So, no need for Munter/prisik as I was thinking.
Did you guys come up with this, or been around for a while?