rigging65 0 #26 May 19, 2003 QuoteIf the lines aren’t stowed to the bag securely enough, they can all slip out at once. That means the stow bands attached to the bag are literally yanked right off the stowed lines. This is known as “line dump”, and can lead to a very dangerous out of sequence opening. If the locking stows fall off, the canopy is released from the bag and will start to open before it has reached line stretch. It starts filling with air almost instantly while canopy and lines go everywhere! When the jumper traveling at terminal velocity finally reaches line stretch, he already has an open canopy and receives a brutal opening shock. I would say, based on the information already put out in this thread, that this article is blurring together Line Dump and Bag Dump. If you're locking stows stay in place (or at least if the bag stays closed until you want it to open) there is very little reason to be concerned. If this wasn't true, how would you justify the reserve free-bag that has been used for years?!? Again, Line Dump and Bag Dump are separate things and, IMO, should be treated as such. To that end, Bag Dump is dangerous and needs to be cared for, lest you break your canopy or yourself! Line Dump, on the other hand, is less of an "issue" unless it's somehow causing tension knots in your lines. I would say the caveat to that is that the Old Skool method of freestowing (ie- just piling the lines in the bottom of the container) may be more prone to developing tension knots than stacking the lines in some sort of a pouch (like on a freebag). I've got nothing to really prove this, but it seams to make sense to me. "...and once you had tasted flight, you will walk the earth with your eyes turned skyward. For there you have been, and there you long to return..." Quote Share this post Link to post Share on other sites
mikeat10500 12 #27 May 20, 2003 Line Dump?----------------------------------- Mike Wheadon B-3715,HEMP#1 Higher Expectations for Modern Parachutists. Quote Share this post Link to post Share on other sites
dterrick 0 #28 May 20, 2003 Ryan: VERY nice (set of) posts on the line dump/ line twist situation. There are 2 things you've said that make PEREFECT sense in light of some recent events I've had. I fly a Raven (old, tired 1:1) and as I learned the canopy it slammed me many many times. It's a reserve design, after all and it SHOULD open briskly. I've jumped big Sabres with hard openings before but when I get slammed under the Raven it's Badddd. My rigger/DZO has done lots to improve life including building a pocketed oversized slider to replace the slider I killed with hard openings. I cloverleaf like PD suggests (I'm now VERY anal about slider position and grommet position while packing) and I am VERY conscious about having snug elastics and large bights per the jumpshack manual (old Racer). Bad openings often accompanied broken elastics which sounds a lot like a chicken/egg scenario. I've not yet downsized the p/c but it's a big F-111 (30" I believe) and I bet I could soften the whole process up by reducing the anchor force... Regarding your comment on line slack - when I first started flat packing my rig off student status one thing tha my rigger commetned was that "it's better to have more slack than less as long as at's neatly placed in the container" - now as a rule I almost always have 24-30" of slack after the last stow ... enough to make another stow and then a bit - since I quit binding the lines all the way down I have had NO line twists at all ... except for this weekend where I dumped headlow, had a p/c entanglement /horseshoe (Beer!). Once I kicked the p/c out to where it should have been and the Raven opened with a mighty FOOMP! the line twists were right at the risers - and I was STILL on the heading I thought I should have been on. Good words from you. Confirms some suspicions for me. Dave PS: I've been able to pack the big Sabres so that they actually snivel and their owners LIKE this Life is very short and there's no time for fussing and fighting my friend (Lennon/McCartney) Quote Share this post Link to post Share on other sites
rigging65 0 #29 May 20, 2003 Quote Line Dump? ----------------------------------- Mike Wheadon B-3715,HEMP#1 Higher Expectations for Modern Parachutists. Something like that....silly BASE heads. "...and once you had tasted flight, you will walk the earth with your eyes turned skyward. For there you have been, and there you long to return..." Quote Share this post Link to post Share on other sites
