Reliable, high load, easy release system

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Reliable, high load, easy release system

Postby AssTechWarrior » 21 Jun 2018, 23:01

This may be old hat for some here but it is something that anyone with a few bucks and some sewing skills can build.

It's called a 3 ring release. Often used by skydivers to released a fouled chute so the ones for sale are pricy but the design is simple.

It looks like you need some flat nylon webbing, 3 metal rings of increasing size and a grommet as well as a bit of thread and a short piece of smaller nylon.

Wiki entry with gif:
https://en.wikipedia.org/wiki/3-ring_release_system

Video of one releasing under load
https://www.youtube.com/watch?v=AItz8GcYx60

Could use an ice drop weight to pull the release or just about any other technique
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Re: Reliable, high load, easy release system

Postby Sir Cumference » 23 Jun 2018, 01:58

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Re: Reliable, high load, easy release system

Postby Gregovic » 23 Jun 2018, 12:04

I was going to post about not needing metal rings for all of the loops. Sir Cumference beat me to it (as usual :wink: , I'll put it down to great minds thinking alike). Even in parachutes nowadays the top (smallest) loop is usually a fabric/webbing loop. Because it wears less on the closing wire and thus makes it more reliable.
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Re: Reliable, high load, easy release system

Postby AssTechWarrior » 27 Jul 2018, 21:02

I decided to build Sir cumference's rope and wood version. It worked well and can be made easily.

Used 4mm paracord, 5mm drill bit and a piece of pine wood
1.jpg
finished first

Note the cotter pin for a release. You could use anything smooth, I had these
2.jpg

Support hole across board, 2 holes for each loop.
3.jpg


4.jpg

Stretch and tighten loop before drilling holes for next loop
5.jpg
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Re: Reliable, high load, easy release system

Postby AssTechWarrior » 27 Jul 2018, 21:15

Locate holes so the rope has slack or release can be harder
6.jpg

Make 2 or 3 longer loop then one very short loop with vertical holes for the release pin
Here is a 25 pound weight hanging on it, release is easy, maybe a pound or 2 of pull on string

Now for scenario setup:
hang on hook and attach weight to ring and the end of a slider type tie down strap so the strap will tighten when the wieght falls down
7.jpg

Here it's the tie down on the right attached to the weight. The tie down on the left is for the arms, the loose hanging end gets locked onto cuffs, the other end goes to the weights in the last picture.
a sock with 3 ice cubes will be used in place of the clip for a release mechanism on both arms.
8.jpg

Other end of the tie down goes to a chain threaded through another hook. When the weight is released, the chain will pull towards the hook and won't let it go out. Perfect to loop around one leg and lock into place
9.jpg

For my arms, I used another pair of tie downs and sock based ice releases to pull the arms tight.
each ring will have a sock with an ice cube threaded through it then tied to the chain. when that's there, the clip is removed and it tightens when the ice cube melts.
10.jpg

Key to the chain locks is on an ice lock hung above the 'victim'
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Re: Reliable, high load, easy release system

Postby AssTechWarrior » 27 Jul 2018, 21:23

About to test it out...
11.jpg


You can't see the string stretched in front betweeen the 2 cotter pins for me to release the leg weights once all the locks are closed and slack on arms taken up


It worked very well

a couple things to watch, if you dont let the weight reach the ground the chain will pull your leg all the way to the hook and that might be uncomfortable.

One normal ice cube in a mens athletic sock at room temp takes about an hour to release a 15 pound weight.

3 cubes in the sock holding the smaller loop of the arm stretch tie down came free after 2 hours with some tugging.
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Re: Reliable, high load, easy release system

Postby Sir Cumference » 02 Aug 2018, 16:43

Nice!
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