multi for static line jumps

[claus]

hello to all the experienced static line jumpers out there ,since we had a couple early
breaks on a sl jump(looks like only to people jumping multis) . we think the problem could be the multi which seems to take more force to open,any thoughts out there .


thanks softclaus

and flame on

[346]

Hey, you crazy German.. Are you still stowing that multi 5-6 cm like in the April thread?

http://www.blincmagazine.com/forum/d...=13462&page=10

And, are you using 80 lb breakcord or are you using some home-brewed scotch tape contraption?

Mark :7
SD#2

[imported_Tom Aiello]

This is from the BR owner's manual:

>With assisted jumps (i.e., static line or pilot chute assist) the air speed and opening forces from this type of jump may not be sufficient to open the Velcro sheath. The opening canopy will be slightly restricted as the Multi lines attempt to open the sheath. Instead of the sheath opening during deployment the sheath tends to compress. Therefore, on assisted jumps it is advisable to close the sheath around the red line only, leaving the 3 white lines unrestricted.

It looks like they are saying that the sheath can cause a snivel, but it doesn't seem to mention greater force on the attachment. How are you attaching the break cord? Maybe the attachment is different?

Also, are you closing the sheath?

I'd guess that the multi is causing a secondary "snatch" when the sheath is pulled out of the stows. Have you tried doing a s/l with the multi free stowed?

The angle of pull will also be different, and on a head high s/l launch I could theorize that the top flap might bind the multi, creating the premature breakage.

Are all the rigs the same? In other words, are you getting premature breakage on your velcro rigs, or pin rigs, or something?

I don't know. I can think of lots of reasons that might happen. Are you leaving the multi on out of habit/laziness, or is there a reason you want it in place for the jump? I bet removing it would help.

I guess all I really have is a heap of questions. Sorry for that.

--Tom Aiello
tbaiello@mac.com

[crwper]

I've done a few s/l jumps as low as 111 feet with the multi in place, and have never noticed a problem. As Tom noted, the sheath becomes compressed rather than opening up, but it doesn't seem to cause a noticeable snivel (opening times off the 111-footer were the same as an identical canopy not equiped with the multi).

How are you stowing the multi? On some of these jumps (particularly the very low ones) I've just free-stowed the multi at the top of the pack tray. On anything over 130 feet or so, I typically use the usual half-inch stows.

Are you using milspec break cord?

A note on body position -- most of my static line jumps have been with minimal forward launch, and a fairly upright body position.

Michael

Sorry, I own a Dagger and don't have these wierd issues! Good luck.

[BASE_689]

Since 20 jumps ago up now and still continuing to do so, for stowing the sheathed multi stows I switched to use the yellow very thin rubber bands (=strips/lines, to be more precise) you use at home/office/school, the rubber bands that are 1 mm thick and that you can buy in any stationery shop.
Few times I checked the multi stows set up after a hike/after a climb up a ladder, and even if the yellow rubber bands are so thin, they kept the multi stows in place. On the other side, they obviously allow the multi stows to be cleared by a force nearly close to zero.
The above thin yellow 1 mm rubber bands could be a really good compromise between still using the multi stows "rubber-banded" (to keep the multi S's in position) and NOT refraining in (nearly) any way multi stows clearance.
Any comments on the 1 mm rubber bands?
A note: when I do my SL jumps, I DO NOT use the sheath: I simply close the sheath on itself (=around red line) but I still do the stows with the four free multi lines (using the yellow thin rubber bands).

Stay safe out there
Blue Skies and Soft Walls
BASE #689 :D
e-mail: base_689@yahoo.com

[crwper]

>Any comments on the 1 mm rubber bands?

I would think this will work just fine. How much are you stowing with each loop of the multi?

I think there are two reasons for stowing the multi. The first one is just to keep it organized and in one place while you hike/climb. The second reason is to stage the deployment of the multi somewhat -- you can imagine that if the multi just came off your back in a big lump, it would be possible to develop some sort of tension knot in there. I think this is fairly unlikely, but I guess you're just as dead if you go in due to an unlikely but preventable problem.

On very low freefalls I've gone both with the multi stowed and not stowed, and haven't really noticed a difference. I stow maybe half an inch in each bight -- so even using the thick black rubber bands there's not much pull force.

Michael

[BASE_689]

> How much are you stowing with each loop of the multi?
Uhhmmm, I would say that I stow each loop for 2÷3 cm, that is 1".

I perfectly agree with all the rest of your post. Staging the multi even with a very small "clearance force" is not a bad idea at all, just in case it ever happens to you the famous deployment out of a million... :*

Stay safe out there
Blue Skies and Soft Walls
BASE #689 :D
e-mail: base_689@yahoo.com