Basejumper.com - archive

Was watching the video in this thread: http://www.basejumper.com/...;;page=unread#unread

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

What are the main reasons for closing a container side flaps last rather than finishing bottom then top? Is it ultimately all down to promoting symmetry?

>promoting symmetry during closing
>most even distribution of pressure over the elongated base pack job (esp 2 pin)
>promoting symmetrical extraction

And then on 2 parachute systems where there isn't the issue of even pressure over an elongated pack job? still simply promoting symmetry of extraction? neater/smoother looking rig?

what would the main negatives be on designing a (base) rig to close top flap last?

obviously everything works fine as it is with right pin tension...

this vid just set me questioning... ;)

hehe maybe I answered it myself.... but interested in design development... if things were tried differently in the past and discarded...

the prism closes top flap last.

The only real reasons i can think of are design.. Also to have a cleaner container surface for doing terminal jumps, with side flaps closing last, That usually means the top and bottom flap excess is neatly tucked away under the (side) flaps. But on most rigs, That would leave the pins uncovered, Because MOST pin protection flaps are integrated into the side flaps.

Symmetry probably has something to do with it, but even if it closed oposite, right side, left side, top bottom. Thats still symmetrical, in the since of "What you do to one side, Continue and do it to other side".

The reason that guys flap came open, resulting in a near horseshoe was the fact he has a NEW canopy, He lengthend the closing loops, to make it close easier, After a few jumps, and packing technique was fine tuned on that canopy, The pack volume was much lower, Resulting in pin tension that was to loose. There are a number of things that can have negative effects from closing loops being to long, And also to short. Any time your not sure of the length for your rig. contact the manufactuer, or find your owners manual.

Just my 2 cents.

I don't think I really understand the question. You can't close the side flaps without closing either the top or bottom flap (depending on which pin you are placing) on most two pin rigs.

You can close any two pin rig bottom flap first if you want to. You just have to be careful to manage the nose and not distort it.

Generally, we close the top flap first because it locks the nose into place, so that if we fight to close the second pin we are less likely to disarray the nose of the canopy (which is pinned under the top flap). But that can vary a lot depending on how you fold the canopy into the pack tray and also how you close.

He means having the closingloop on the sideflaps instead of bottom/top.

Closing in the order bottom, sides and then last top flap will make the top flap work as a lid with the help of wind.
And in theory keep the rig closed even if top pin comes lose.

Thats what I think he means.
Not just closing order on normal rigs.

Ah, ok. Now I understand.

I don't think there is any reason you need to have it in any specific place--it's just a matter of designing the rig to work.

I have rigs with closing flaps on the side (Prism 1), top and bottom (most 2 pin rigs), and top flap (Prism 2).