See bungees stretch

[dynamite 1]

Ever wondered how much bungees stretch on deployment.

Check out these pictures I took of a tandem deployment.

http://www.ukskydiver.co.uk/phpBB2/album_page.php?pic_id=126

http://www.ukskydiver.co.uk/phpBB2/album_page.php?pic_id=125

[dynamite 1]

Whoops

Clickable

http://www.ukskydiver.co.uk/phpBB2/album_page.php?pic_id=125

http://www.ukskydiver.co.uk/phpBB2/album_page.php?pic_id=126

[piisfish 140]

that's impressive...

for links, click the url button, insert the link click th e/url button

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[gus 1]

Very cool to see that, thanks for the pics.

Gus

OutpatientsOnline.com

[rigger_john 0]

Are those bungees, RW spec, or some other? just as a matter of interest, how was the rest of the opening?

_________________________________________

Nullius in Verba

[dynamite 1]

They use large 'tandem' bungees or double bungee the bite.

From where i was the rest of the opening looked fine.

[AggieDave 6]

And that is the dynamic forces on canopies and how it is possible to get bag strip. That is also why RWS states you should use tube stows on the locking stows on their tandems. To prevent bagstrip.

--"When I die, may I be surrounded by scattered chrome and burning gasoline."

[meatbomb 0]

Quote

They use large 'tandem' bungees or double bungee the bite.

Those really don't look like the double width RWS spec bungees...are you sure?

The one on the extreme right looks like it's a normal dacron bungee doubled, and the extreme left looks like a broken RWS tandem bungee...

It's always good practice, no matter which bungees you're using, to make them symmetrical...I was asked to pack a Portuguese Tandem at Alvor once. I took one look, and started looking around me for Jeremy Beadle! It had a normal dacron bungee that had broken and been tied together for one mouthlock , and a thin piece of bungee cord tied off and larksheaded like a bungee (but big enough to stretch around my head (which is quite big!), for the other...

Nasty stuff...

---
Swoopert, CS-Aiiiiiii!
Piccies

[dynamite 1]

They use both at the DZ - no idea which they used on this occassion.

[rigger_john 0]

Quote

That is also why RWS states you should use tube stows on the locking stows on their tandems. To prevent bagstrip.

Where do RWS make this statement?

_________________________________________

Nullius in Verba

[AggieDave 6]

Quote

Where do RWS make this statement?

It was in the documents that were sent to me by RWS for my tandem course a few years ago. It was also apart of a powerpoint presentation that Bill Booth did at a few PIAs ago.

I guess you'll want me to trudge around their site and see if I can find it, huh?

--"When I die, may I be surrounded by scattered chrome and burning gasoline."

[rigger_john 0]

Quote

I guess you'll want me to trudge around their site and see if I can find it, huh?

No not at all. I wasn't doubting they made the statement, just observing that I couldn't find it. I tend to go with the manuals, although intrestingly the new Sigma manual is nowwhere near as detailed as the Vector Tandem 2 manual. It doesn't have detailed line drawings of the drouge packing for instance, and no mention of what type of stow bands to use.

_________________________________________

Nullius in Verba

[AggieDave 6]

Quote

tend to go with the manuals, although intrestingly the new Sigma manual is nowwhere near as detailed as the Vector Tandem 2 manual.

I agree. Remember, though, that the Sigma manual was created as a suppliment to the Vector tandem manual.

Seeing how RWS is going hands off with the certification process defering to the USPA rating, I wonder how much actual documentation we'll continue to see?

--"When I die, may I be surrounded by scattered chrome and burning gasoline."

[rigger_john 0]

[replyI agree. Remember, though, that the Sigma manual was created as a suppliment to the Vector tandem manual.

[mcashatt01 0]

Quote

And that is the dynamic forces on canopies and how it is possible to get bag strip. That is also why RWS states you should use tube stows on the locking stows on their tandems. To prevent bagstrip.

Sorry I'm unfamiliar with the term bag strip. Could someone explain?

[ernokaikkonen 0]

Some people call it "line dump" which is actually a related phenomenon but not quite the same.

The way I see it:
Line dump: All lines deploy simultaneously
Bag strip: D-bag opens and canopy starts to deploy before line stretch

[dynamite 1]

I have a video of tandem line dump at the same dz - perhaps a coincidence. I have posted it to skydiving movies and will post the link when it has been approved.

[rigger_john 0]

Is that Mr Frozen Finger in that picture, Things still "grim op north"

_________________________________________

Nullius in Verba

[dynamite 1]

Video of the line dump is here http://www.skydivingmovies.com/ver2/pafiledb.php?action=guestpass&id=k4pzx

No that's not Ian - he rarely ventures into the sky anymore and when he does it's usually with the aff.

It is indeed still grim up north!

[AggieDave 6]

Good video. It also shows an interesting point, the difference between line dump and what people *think* linedump is. As long as the locking stows stay and the bag stays on the canopy till bag stretch, you'll basically have a normal opening (tension knots not with standing). That Bag Strip is out of sequence type deployment of the main prior to line stretch, which is what can call openings hard enough to kill, injury and seriously damage gear.

--"When I die, may I be surrounded by scattered chrome and burning gasoline."