Forums: Skydiving: Gear and Rigging:
Stowing slider in a rubberband: any downsides?

 


Premier skydiverek  (C 41769)

Jun 19, 2013, 7:06 AM
Post #1 of 8 (2955 views)
Shortcut
Stowing slider in a rubberband: any downsides? Can't Post

I wrote PD about it, and they only said they do not advocate it. Any downsides to this method???:

"UPT
September 5, 1986
Effective Immediately. Please stow main canopy slider in a rubber band which you have attached to the
center "B" line attachment point. (Do not stow it to the tail.)
Reason. Occasionally, during main canopy deployment, the collapsing drogue exerts so much force on the
deployment bag that some or all of the stowed suspension lines "slump" out of the rubber bands prematurely
causing a reverse sequence (canopy first) deployment.

A canopy first deployment usually works out OK. The
main problem is that if the slider is not stowed, .it too might slip down the suspension lines before line stretch
causing a hard or off center opening. An off center opening can concentrate opening forces on one portion of
the canopy or one line group. We believe this is responsible for several broken main rear risers which have
recently been reported to us. Broken risers are obviously not very common. This problem took many thousands
of drogue jumps to show up and we believe stowing the slider should prevent it.

I am working on a bag modification which I think may prevent line "slump" and will let you know as soon as
it is "perfected". In the meantime, I urge you not to experiment with other "solutions" such as using bungee
cord locking stows instead of standard rubber bands. In some instances, this could cause a bag lock which is
a far worse problem than already exists.

Sincerely,
William R. Booth
President"

Source:
http://unitedparachutetechnologies.com/...0Bulletins/09218.pdf

***AND***

JUMPSHACK
TANDEM CANOPY ASSEMBLY
All canopies should have a rubber stow band attached to the line attachment point of one of the inboard C lines. The center of the slider should be
stowed in this retainer during packing. The purpose
of this retainer is to prevent the slider from coming
down the lines prematurely. It is a good idea to do
this to any canopy.

Other canopies may require that the stow band be
located on the B line. This may be determined by
pulling the center of the slider up into the center of
the air channel with the slider grommets firmly
against the slider stops. Observe where the point 3
to 4 inches from the center point of the slider falls,
and locate the stow band on the nearest line attachment point.

SOURCE, page 8:
http://www.jumpshack.com/..._Manual_May_2008.pdf





JohnSherman  (D 2105)

Jun 19, 2013, 8:27 AM
Post #2 of 8 (2771 views)
Shortcut
Re: [skydiverek] Stowing slider in a rubberband: any downsides? [In reply to] Can't Post

In reply to:
I wrote PD about it, and they only said they do not advocate it. Any downsides to this method???:

It is standard procedure within the competition to refute anything developed by Jump Shack. There is no down side to the procedure. We have been requiring it, in our manual to use a rubber band on all canopies since the beginning of Ram-airs in the 70's. I believe most manufacturers do now endorse the concept.

Having said that let me caution you to the fact that while the rubber band on the slider will keep the slider from "falling" or inertially being pulled down the lines during opening it will not hold/help if the canopy begins inflation (spreading) and forces the slider out of the rubber band and down the lines before you reach line stretch. This can only be prevented with a bag which will not allow line dump/strip.


Deyan  (D 322)

Jun 19, 2013, 12:51 PM
Post #3 of 8 (2554 views)
Shortcut
Re: [skydiverek] Stowing slider in a rubberband: any downsides? [In reply to] Can't Post

In reply to:
I wrote PD about it, and they only said they do not advocate it.

Maybe because they use snap buttons?


Premier skydiverek  (C 41769)

Jun 19, 2013, 1:52 PM
Post #4 of 8 (2460 views)
Shortcut
Re: [Deyan] Stowing slider in a rubberband: any downsides? [In reply to] Can't Post

But they use snaps only on Velocities...


riggerrob  (D 14840)

Jun 19, 2013, 8:52 PM
Post #5 of 8 (2281 views)
Shortcut
Re: [skydiverek] Stowing slider in a rubberband: any downsides? [In reply to] Can't Post

skydiverek wrote:
But they use snaps only on Velocities...

............................................................................

.... and Zero canopies


riggerrob  (D 14840)

Jun 19, 2013, 8:55 PM
Post #6 of 8 (2277 views)
Shortcut
Re: [skydiverek] Stowing slider in a rubberband: any downsides? [In reply to] Can't Post

skydiverek wrote:
I wrote PD about it, and they only said they do not advocate it. Any downsides to this method???:

"UPT
September 5, 1986
Effective Immediately. Please stow main canopy slider in a rubber band which you have attached to the
center "B" line attachment point. (Do not stow it to the tail.)
...............................................................................

Yes,
I remember when that was announced. A fellow TI stowed his slider - too tight - in a rubber band. The slider never came down. He cutaway and deployed his reserve. We never stowed another slider in a rubber band.




Premier skydiverek  (C 41769)

Aug 22, 2013, 4:15 AM
Post #8 of 8 (1398 views)
Shortcut
Re: [skydiverek] Stowing slider in a rubberband: any downsides? [In reply to] Can't Post

Method presented:

http://www.youtube.com/...amp;feature=youtu.be



Forums : Skydiving : Gear and Rigging

 


Search for (options)