Basejumper.com - archive

Here is a photo of a crap built PC.
Maybe it is a old one, but it is crap. If you have one built in this style, suck off 30%. 32" would equal to 21". If you don't understand why it is crap, I will explain. But the knowledge is out there.
Take care,
space

i give up!
please explain.

i dont get it, not even sure what im looking at.

is it the PC laying flat? connection laying on top of internal handle?

If the internal handle gets through the hole in the mesh, the PC won't inflate?

didnt think of that, sounds correct!

the floating handle idea is a good one...

is the centerline attached to the handle ala pull out system? if thats the case the apex would be pulled too far down almost like a collapsiable skydiveing pc...?

The mesh isn't cut out of all 4 sides of the base?

Derek

ok 1 more guess Maybe ?
Only 2 pieces of load-tape. Or really 2 pieces that are X-ed to divide the Mesh into 4. It is not perfect but a better shape is formed from the flat disks of mesh bottom and ZP/F1-11 top of PC. When you use 3 or 4 pieces crossed.
Better shape for more efficient pull and less oscillation ?
.

my 2003 vertigo 42" has only 2 peices of load tape x'ed. i think its fine.

but we need to get the authors reasons now, , , or is he testing us?

Two will work fine if done right. It just not the best design to make a air-pullling shape from 2-disks.
Hard to tell and pinpoint the PC problemo from the little Pic. ?

The tapes are on the block instead of the bias.

I thought of that, but they look like they are on the bias to me. I looks like the mesh goes from the top left to the bottom right with the tapes going vertical and horizontal in the pic. Maybe I am looking at it wrong.

Derek

All the mesh is there for is to prevent inversion right? It doesn't really take any load as such so it doesn't really matter does it?
dunno, maybe I'm just being dumb...

still i have absolutly no idea what is going on.

I thought that too.

I have photoshoped what I see as the "grain" of construction.

Now - since the whole point of installing binding tape on the fabric is to prevent stretch in the direction that fabric can stretch the most - which direction is least dimensionally stable in large mesh? Have I not drawn the angles correctly for the mesh?

See attached photo of what I identified as the block. On mesh, is the block different?

Second question -as someone pointed out... Since the mesh does not take load, or "that much load" - how much does it effect the overall shape of PC when inflated?

Ah... now i get it, the PC when inflated and loaded will seemingly 'collapse', the load tape should be rotated 45 degrees,

So...who made the pilot chute in question?

Isn't the load tape already at 45-degrees to the blocks?

Derek

I have a 42" pc of the same construction made by Gravity Sports. I have not jumped it yet. Wanted to gather some opinions first. Glad someone brought this up.

no, im surprised i did not notice it right away.

the tape should be placed parallel to the direction that the mesh can be most easily stretched. with it the way it is, the mesh can stretch a lot and deform the PC sail.

if it was turned 45 degrees, there would be effectivly a load tape at ever 45 degrees, instead of every 90.

I have built a few PCs with 3 seperate 'pizza' mesh triangles, and 3 seperate ZP sail triangles. it was a bitch, but the differences in sail distortion was interesting.

I actually started playing with mesh... Found on a few PC around the house, my laundry bag, on a few skydiving reserve PCs, fine mesh sliders, and mesh liners inside my motorcycle jacket, freefly pants and swim suits, etc). I found that the direction of least dimensional stability is different depending on the weave of the mesh (square grids vs circles, large holes vs small, etc). I now believe, from a photo alone, I could not predict the angles in which to install the tape.

So - what I learned - test instead of just look.

a GS PC. man how long you had that thing and not jumped it ? Dennis still sewing ?

I bought the rig used this spring and was told the pc was built wrong. Jumping a different pc until I can get more info on it.