Basejumper.com - archive

> I wonder if it's okay to use a static line and have ground crew remove it as soon as the deployment is completed.
Or you can use the "carry-with-you-SL" created (well, I got few inputs about it by somebody, yes... ) and patented (well, you know, not exactly yet patented, but I am on the way... ) by worldwide famous (well, at least my jumping mates and very few blokes abroad know me quite well... )by BASE #689.
I haven't got yet tons of jumps with "carry-with-you-SL" system but the few times I used it, it worked pretty well indeed!!!!
No trace left behind!!! Unless you witness the jump from proximity, you cannot say it was a SL jump (unless for the very high deployment).

so far do i have 20+ jumps from 180/165ft by the carry on SL(made after supervise from the master of this peice,thaks i dont know how to pay you back),it works really well,only thing i have on it is that you´ll need to consider the place were you secure it from object to object so you use the length Carry on SL that fits for the object(so you minimize the risk of a SL hangup,which will ruin your canopy and the day).
Besides that i can only say gooooood envention so far.

Only thing i need is a thing that collect rubberbands and breakcord after the jump

By the way Dexter that S is HIGH,your getting looooooooong canopy rides from there if you do it.. i personaly did 1 test jump off a 300ft A,then i were convinsed...just dont for get the PC

> so you use the length Carry on SL that fits for the object (so you minimize the risk of a SL hangup, which will ruin your canopy and the day).

Well, indeed, if you followed LITERALLY my instruction, you must connect the "spare branch" of your "carry-with-you-SL" to the loop in your bridle via a loop of break cord, so the possibility of hang up is ZERO. In case of (temporary) hang up of "carry-with-you-SL" onto handrail/frame/object/whatever, after a split millisecond you will have broken such a link (it's just a second (=looser) loop of break cord, that some jumpers use it (the second break cord loop) when jumping off very low object where they DO NOT use the backup PC (scary!!!)).
Yes, losing such an invaluable piece of equipment, yes, leaving traces, yes, but flying free toward freedom and not ruining at all your day (nor the canopy).

P.S.: > i have 20+ jumps.... you have more jumps than myself using the device I created? I am jealous!!!
P.P.S.: What about showing up at my places? What happened?

From the photos the canopies appear to be 28-foot military surplus Cheapos, not 35-foot T-10s . . .

All us "old school" folks made their first skydives with these.

The bottom line is they are doing something very dangerous in that a first time jumper, doing a first time water landing, unless assured of being assisted, could find it difficult to deal with all those lines and all that material in the water.

Nick
BASE 194

im living 5 mins away from this really nice 180/165fter which entertain me on wordkdays-nights...(night jump),actualy i got myself a bike as im too lazy to walk to the object,the bike has only been used for BASEBut hey we both wrote 20+ perhaps you have more than me anywaythink im about 22-23 or so

your using breakcord instead of a cornectorlink to secure the devise on your bridel?

how can you then control that its the correct breakcord breaking first?I dont have anything my line can catch on the object im jumping at the time,but for future objects...

Tom you perhaps want to Split the SL to another tread?

you never got my teksts or mails?We started Q about all the driving time down there and up back so we desided to wait untill we can book flight tickets and fly down there as i rater be there than sitting in a car,most of the time..Sorry if you didnt got the messegedesBut we desided to get more mony for such trip and actualy talked about getting them so we could plan a trip(that will work)next summer.sorry mate

Wait a second guys! I don't mean to nitpick, but the device you are referring to as the "carry-with-you" static line bridle was actually my idea.

I figured it out in a thread a little over a year ago. look here I'm sure someone has done it in the past before we brainstormed it.

I emailed a leading BASE maufacturer to see if they had any interest and offered the idea to them. They thought it was a good idea and didn't see any problems with it. They asked me if there was a demand for it in my crew and I honestly replied, "No".

So! If you're planning on patenting the thing, go ahead. I posted it here as a free piece of information for the BASE community. My offer to the BASE gear manufacturer was also free.

Have a good day!


Note: please don't take this post seriously!

> your using breakcord instead of a cornectorlink to secure the devise on your bridel?
Yes, my friend, just have a careful look at my original photos (my special bridle is sort of green-blue colour and any piece of break cord is sort of whitish).

> how can you then control that its the correct breakcord breaking first?
It's very simple. The way the "spare branch" is made, makes it very long compared to the length of "really-going-to-break" break cord loop. The "linking-second-break-cord" loop has got at least 10 cm of slack.
The first thing that happens when you jump off the object is that at line stretch you put force onto the "really-going-to-break" break cord loop and you break it.
After another 10 cm of fall, you simply "finish" the slack of spare branch and you simply pull (giving a whiplash onto handrail) the "carry-with-you-SL" through the secondary break cord loop.
When you pass the "really-going-to-break" break cord loop: 1) through first loop of main branch of CWYSL; 2) through second loop of main branch of CWYSL (the main branch of CWYSL is AROUND the handrail); 3) through loop of your bridle, you have a very tight "system".
Such a "really-going-to-break" break cord loop is quite tight, perhaps 4 cm in diameter, all the (three) loops are quite close together.
The spare branch is way longer that all the other parts and finally is physically connected to the bridle itself via "linking-second-break-cord" loop: there is a slack of at least 10 cm, reasonably about 15 cm.
There is NO WAY to have the "linking-second-break-cord" loop to go under tension before or at the same time as the "really-going-to-break" break cord loop... ...unless you use a "really-going-to-break" break cord loop that has got a diameter of 20cm (using half a meter of break cord to form it)!!!!!!!!
Normally, I use 25 cm of break cord to create the "really-going-to-break" break cord loop, of which length quite a bit goes into forming the knot, so ending to have a "really-going-to-break" break cord loop of 3÷4 cm of diameter, no more!!!
Again, look carefully the original photos I sent you in high definition, got them zoomed and you will clearly see what I mean.
In the mean time, take care!!!!!!

hmm i can rember alot of talking about it,and actualy thourght it were Andrea as he were the only one who actualy had made one,corret?

Well i give both of you guys the credit,hell even all who responded to that tread

Patent or not its so easy to make that if there is im making copyes for myself anyway

I dont think Adndrea meant it serius aswell(as you said it your self its a year since)

and dont come spoil my fun.. i like it weather who got the idea and so on.. i just jumps it(i really like the thing..)

by the way from now on evrybody can call me lukey luke as i yesterday were abel to be so fast on my risers after pitching(had some funny winds so i expected funny shit to happen),that i couldnt find them as they hadnt left the harness yet

luv ya guys(dont take that too seriously)

by the way im on Dexters site,well atleast untill i get my gear home in 1 peice

> ...the device you are referring to as the "carry-with-you" static line bridle was actually my idea...
> So! If you're planning on patenting the thing, go ahead.
Probably it is the fact that English is NOT my first language and so my attempt of humor are not exactly taken the way they should be by native-English-speakers.
Probably it is the fact that Italian humor is not exactly well understood by Americans.
The only sure thing is the following: YES, Dexter, the idea of "carry-with-.you-SL" is YOURS!!!!!!!
Perhaps I was the first to use it, perhaps not.
Possibly I am the first to have used it AND to have posted about it and details of its setup.
Furthermore, I must give credit to Michael-CRW for the idea (very smart indeed) of connection of "carry-with-you-SL" to bridle via a secondary break cord loop, just in case something got entangled, after a split millisecond you again free.
Take care, my friend Dexter, where you are, try to come back in one piece and if you ever have the chance of coming to Italy, please drop me an e-mail that we can share few nice objects together.

hey Andrea! hope all is cool with you! sorry still have not got hold of that video - but T is still moving around various relations for his rehab and has not returned home yet - I still have not got hold of my rig from him after 3 months!

He is doing ok, but I guess with both legs fucked up it must be driving him mad!

Nice to see ya back writting up - if your on MSN drop me a line (sms / email) and give me something to do during the day too! remember I am still in rehab but at least with one good leg!!

Be cool Bro!

Michael
PS) I hooked up that guy with some numbers of people who will be glad to take him around on his visit (sorry I could not), just in case you did not know!!

If any dont like that the carry on SL thing has been splitet by my request then speak up now or shut up for ever

Its on my bill Tom,any agressions pointed at you by splitting this tread you can send my way and ill respond tem

Thanks anyway...

For those of you who are looking, here's pics of base689's setup

I was doing a bit of testing with one I made out of 850lb dacron and found some interesting stuff about knots.

I've always tied my break cord in a circle using repeated square (surgeon's) knots - and this is what I've understood base689 to be using in the setup for the carry-on SL system.

This knot is pictured in the first image (sl-carry-knot1.jpg) and the second (test1_knot.jpg). In all the pics, I've substituted the the bridle with a carabiner for simplicity of loading etc. I then piled weight onto the setup, very slowly and carfully so that no acceleration except for gravity is applied to the system. In this first test, the breakcord broke just after I took the picture (test1_hang.jpg). Go ahead and make fun of my weights. Then I piled all this junk onto the scale = (test1_weight.jpg) and the weight was 105 lbs at break time! The carry-on worked flawlessly and the breakcord broke in the middle of the loop.

That seemed like a lot more than the 80 lbs it's supposed to be, so I decided to try another method, thus test2. In this test, the breakcord is tied to each end of the carry-on rig, and care would have to be taken to make sure there's not a lot of friction at the bridle attachment point (or else the force would be doubled!). The knots are detailed in (test2_knot.jpg). The weight is applied (test2_hang.jpg), and just after the last rock was added and that pic taken - it broke (test2_break.jpg). This time, the cord broke with 98 lbs. (test2_weight.jpg) - 7 lbs less than the previous method. This method would have a problem if the bridle bound the breakcord in any way - where as the circle/loop method used in test1 would always be free to break at the attachment to the carryon device.

I also though someone might try to lower the force required by tying one end of the breakcord around the carryon device and the other to the bridle - leaving just one strand of breakcord in between. (test3_knot.jpg) This would be a BAD thing however, as when the cord breaks - the loop will still be tied to both sides of the carryon rig (test3_break.jpg) and force will then be doubled or worse.

I'll be using it with the first method because it seems to have the lowest propensity for error. However, I would prefer it if it broke with less weight - any ideas folks?

I'm curious to know what sort of 'thump' the weights made when they hit the floor?


Gardner

MIL-T-5661 Type I Plain Weave cord is designed to have a breaking strength of 80 lbs (minimum). That breaking strength is measured with one piece of material pulled in a straight line. Breaking strength will be reduced by any bends or knots used.

The knots you have in Test 1 and 2 use a "loop" of the material, that is, two pieces. In theory, that would take the breaking strength to 160 lbs. As you found in your tests, the material's strength is reduced (and is weakest) at the knot, so that is where it broke (your test2_break.jpg). A 97lb breaking strength indicates the knot reduced the strength by 63 lbs or about 39%. That's par... Poynter's Manual, Vol 1, Section 8.6 indicates a 40% reduction can be expected with a bowline knot.

I'd go with Method 1 as well - It keeps the whole sling from sliding around. And as you mentioned, I'd avoid method 3 like the plague...

Mark

When I did break cord tensile strength tests, I rigged the loop material up above my head with some webbing (hung it from my garage door rail anchor) and stood on the floor scale. As I pulled myself up using the break cord and webbing, I noted how much of my weight was REMOVED from the floor scale. That told me how much went to the breakcord. It was accurate enough...

This worked because I weigh more than the breakcord was expected to hold...

Mark

A "dull" thump - like the sound of my last post being deleted because it implied a threat of physical violence when comparing the thump the rocks made to other thumps that sometimes happen.

Oh, man, you crack me up. I really can't stop laughing right now.

Do you know if it's possible to buy different strengths of break cord? Paragear only lists one kind, but surely someone, somewhere has needed lighter break cord for something.

Also consider that the application of force on the breakcord is not a static load, like the test method shown. Your all up weight is accelerating away from S/L at the moment that weight is applied to the breakcord. I'm not a mathematician, but this increases the forces applied considerably.

I never seen, or heard of, a BASE jumper in tow (I guess we need a new phrase there) but the opposite, a premature parting of the breakcord, has occurred too many times.

In the same vein, if you compared how we packed for BASE in the old days, when free packing was the rule, and how it’s done now, it’s like night and day. We used to be afraid of any type of reefing that could possibly (even though it was imaginary) hang up the opening sequence. We’d pack thinking, open, open, open. When we should have been thinking, don’t open, don’t open, don’t open. We learned the hard way it’s easier to pack in a way that could blow your stuff up, and much harder to do it in a way where it wouldn't open at all.

One of the benefits of BASE specific gear, and BASE specific jumpers, is we don’t see much canopy damage anymore. I ripped the center cell rib completely out of a Cruiselite once time, and it scared me badly, but there were no BASE canopies available at that time, so I sewed it back together and kept on trucking . . .

Nick
BASE 194

I just can not decide if this is real or a hoax ?
If this is on the level, there seems to be a
Crap Load of extra variables added to a simple
Tie-off static line.
More variables = more chance of things Not Working.
You maybe over thinking this one just a Bit ?
Less is More
Cant you *Simply* just tie off and jump ?
Plain old Break Cord, Its Simple. It works.

sure you can,but then leaving a evidence at the object.. some objects its nice to have it removed soon as you jumped knowing that noone can see you were up there in the first place

And that my freind is why the Carry-whith-you-SL were madeand actualy its faster to hook up than standard SL,i will preffere the carry SL anyday...

Object in tow??

I can't find it now, but I would swear I read of an incident once where some guy db'd or sl'd a B under construction and somehow the bag lanyard became engaged with the canopy/harness? and he swung back into the B and ended up grabbing steel or something.. then proceeded to unhook and climb down??

Maybe I'm just making this up...

Tom:

Dunno about the diff. break cord availability, but I built a sandwiched velcro version that does the same thing and the required force to release is infinitely adjustable (well, not infinitely - in the sense that I always managed to get it to release). My tests were not at all scientific, but based on my experiences with PCA-ing folks. Haven't had the occasion to jump it yet, but I would.

Gardner

> MIL-T-5661 Type I Plain Weave cord is designed to have a breaking strength of 80 lbs (minimum).
> That breaking strength is measured with one piece of material pulled in a straight line.
> Breaking strength will be reduced by any bends or knots used.

WOW!!!!!! Really breaking load is with ONE SINGLE PIECE OF MATERIAL CONNECTING TWO PULLING HEADS?!?!?!?!?!?
Until I read your post, I ALWAYS thought that, just because ALL THE BASE MANUFACTURERS were talking about 80 lb break cord and because our use in BASE (for SL jumps) is to tie such a break cord in a loop, the 80 lb breaking load was referred to the break cord ALREADY SET IN A LOOP!!!!!!

So, finally, I discover that what we get is NOT the 80 lb break cord being little more robust than the "nominal" value, but actually is the opposite way around.
What we actually rig for SL jumps is a 160 lb - 73 kg break cord but because the (surgeon) knot deteriorate (=sharp bending radius) 40% (I didn't imagine the deterioration was so HIGH) of the characteristics of the cord itself, we get something like:
0.6 · (160 lb - 73 kg) = 96 lb - 44 kg
That's how comes the 100ish lb value of the tests of sum1sneaky!!!!!
I justified the results coming from the tests starting from the wrong break load value!!!!!!!
It's true: you never stop learning!!!!!
But, honestly, I think that the BASE manufacturers SHOULD inform buyers of break cord about the real value of break load (so when you do a loop you simply get twice the break load) and about the high deterioration (40%) of doing the (surgeon) knot.
I mean: it SHOULD be way more evident and way more clear in our world what we are EXACTLY using!!!!
Thanks anyway, Mark!!!!

> ...consider that the application of force on the breakcord is not a static load... ...your all up weight is accelerating away from S/L at the moment that weight is applied to the breakcord...
> ...but this increases the forces applied considerably
Well, let's see.
Our body in freefall WOULD exert a high force.
Why "WOULD"? Simply because before break there no force applied anywhere (= not to a fixed point), gravity force is pulling you down and you accelerate, after break again gravity continues to pull you down.
Your body does exert a force ON A STATIC/FIXED POINT only in the few split milliseconds you load the break cord and it breaks. Before putting tension on break cord and after break, there only gravity with no other force that opposes to it, simply it accelerates you.
The bottom line is the above: even if your accelerating body would be capable of exerting a high force onto a fixed ppoint, the break cord cannot hold yourself more than its proper break load.
Rather, I think an interesting argument is the following.
Granted that 100 lb - 45 lb applied statically to break cord loop breaks it, what would happen to our break cord loop if a device capable of applying a variable force (=your body in freefall) actually start exerting an increasing force onto the break cord loop?
When would the break cord loop break if such a variable force is applied dynamically/instantaneously to it?
Would the break cord loop dynamically break BELOW 100 lb - 45 lb?
Would the break cord loop dynamically break ABOVE 100 lb - 45 lb?
I think the dynamic test can only be performed in a laboratory, putting break cord strings between the clamps of a dynamometer and setting it to pull at a fixed speed (perhaps few test at different speeds) and having it to record the load applied between the clamps, up to break of loop. And having a look at the results, especially reading the load AT break.
If you take a 100 lb - 45 lb and apply it gradually to a break cord loop, at the very end of releasing it breaks the break cord loop.
Given for granted that if you step "very fast" over a brick on the pavement, you exert onto brick twice your weight (=dynamic load) just for a split millisecond and then you exert just your weight, if you step "very slowly" over a brick, at the end of slowly process of releasing/loading weight you end up with your weight onto brick.
So, if you take a 100 lb - 45 lb load and release it istantaneously onto a break cord loop, it WOULD exert for a split millisecond twice its weight, but simply our break cord loop cannot hold such a weight and it breaks exactly AT its (dynamic) break load.
It would be really interesting to know if and how much the dynamic break load differs from the static break load of our 80 lb - 36 kg break cord.
If you don't believe to the fact that instantaneously applying a weight onto a surface, the surface itself bear for a split millisecond bear a load twice the weight of the object, try the following.
Take the scale you got at home.
First test: put only one foot onto the scale and very slowly transfer your weight from the foot on pavement to the foot onto the scale: you will notice that the indicator on the scale increases up to your weight, without never exceeding your own weight.
Second test: put only one foot onto the scale and transfer IMMEDIATELY, as fast as you can, your weight from the foot on pavement to the foot onto the scale: you will notice that the scale indicator will exceed your weight (you should read for a while twice your weight, but system itself could be not so fast in "chasing" the actual (maximum) weight value) and then, oscillating it will stabilize onto your weight.

Believe it or not, I just tied 12 feet of 6mm climbing rope to a 4 pound rock and dropped if off my balcony (a fall of 12 feet), it broke 80lb break cord tied in a loop (same knot as in test 1 above).

I imagine the elasticity of the rope is a little less than that of the bridle plus lines and canopy etc - just because it was much shorter - but the rock also fell much less - so that would make up for it. I now don't believe there's any possibility of a jumper's fall being arrested by break cord - no matter what knot you use!

I would try a smaller rock - but that would be for pure amusment and I think I'd rather use my cordage for a jump.

Try braided fishing line, Spyder Wire or similar.
The line ratings are fairly accurate including the knot. i.e. 30kg's knotted with a bowline breaks at approx 29kg.

can someone post a pic of the device?

found this on another tread,as i told ya

> can someone post a pic of the device?
A nice picture is the one linked by Faber, where you can see the "carry-with-you" alone.
Look also at the sl-carry-knot1.jpg picture posted above by sum1sneaky where you can see the "carry-with-you" already rigged up and ready to jump.
Have a look also to my personal setup here as follows, where you can see the overall picture and the detail also.

thanks

i seems to rember that you explained your "bridel" before,but i seems to have forgot.

why is it that you dont use a standard 9ft bridel?
Do you only use that "bridel"on SL jumps,and why?

thanks

> why is it that you dont use a standard 9ft bridle?
Because the load that breaks the break cord loop (100 lb - 45 kg) is applied very brutally/immediately/sharply to the bridle and its seams; I am scared that in the long run the continuous application of abrupt/immediate forces to a standard bridle in SL jumps could damage someway somehow its seams and this could bring one day to deteriorate rapidly your day of jumping (perhaps on a terminal jump or so...).
So I caught the hint from a bloke on the BB (it should have been a US bloke, indeed) that used a 5.5mm dyneema climbing rope as a "special bridle" for all his SL jumps.
IMHO, I think that using a WAY OVERSIZED/OVERDIMENSIONED "special bridle", both in its breaking load (1800 kg - 3968 lb) and its seams (mine has got seams for closing the loops with SO MANY stitches....), takes completely away my gear fear.

> Do you only use that "bridle"on SL jumps, and why?
Yes, I use my 5.5mm dyneema "special bridle" ONLY and EXCLUSIVELY for SL jumps.
Could I use it also in normal freefall jumps? I thinks I could, yes, anyway, it's way bulkier and heavier than a standard bridle, and, furthermore, for handholding the "special bridle" + PC, instead of "S folding" it, I should "figure 8 folding" it, filling way more my hand than what would fill an S folded standard bridle + PC.
On a SL jump, my heavier (perhaps 50 ÷ 100 gr or so heavier than standard bridle, I never weighed it...) "special bridle" is brought to stretch by my weight, so its greater weight is NOT AT ALL a concern, once I break the break cord loop, my parachute is already stretched all the way up and needs only to expand, at that point the weight you have above upper surface of parachute does not matter any more (provided you DO NOT have a 2 kg weight on top of it... ).
Viceversa, freefalling my "special bridle" from handheld setup, expecially off an aggressively low object, would cause me few concerns about its weight that at low altitudes/low airspedd/low available height is a negative issue, having the PC to pull up the pin, the parachute PLUS the additional weight of "special bridle". Plus, handhelding my special bridle, I would end up having in my hand something very bulky/massive.
So, for ANY freefall jump of mine, why not use the 9' - 2.74m standard bridle, which is thin and flat and in use for decades?

just my thourghts.. thanks for shareing

Up until now I've been tying my break cord directly around the anchor point/hand rail (as in staticline1.gif). But on a recent jump I noticed that the break cord is definately breaking where it's in contact with the anchor point. So I'm interested in using a sling and the whole "carry-on" thing. Does anyone have any opinions on the setup in staticline2.gif as a slightly simplified (?) version of what 689 and Faber are using?

Gus

pic2... is there a PC?

Sorry, crap picture. I always leave the pc on.

Gus

the carry on sl is formed like a Y ,you´ll use 3 peices of brake cord(hopefuly only 2 of them will break).

you attach your sling to your bridel by a peice of breakcord,that way if the SL hang up on the object,it will break your cord and leave you under a ok canopy(no harm to it),then basicly as you showed on your drawing,1 breakcord slightly longer than the other so you have a backup in case of a premature break of the first one.
Ofcourse as you say always leave the PC on aswell.

I will gladly show you this(easter05 -uk board),i guess you might have an B i wuld like to jump if im allowed

the pic 2 is no good,if the sl catch the rail youll have a hangup,it could ruin your canopy and the rest of your day...

Yeah you're absolutely right. I didn't spot the 3rd bit of break cord on the pics of your setup.

Gus

After a quick scan of what this thread is about, it looks like y'all are looking for an ultra-reliable static line method????

If so, please see the bridle extension innovated by Todd Shoebotham specifically for the Super Bowl jumps in Houston last year.

Todd created an extension to the bridle that allows for two separate break cords to be tied in; with the pilot chute left attached that gives you 3 separate chances for full deployment.

I don't know how to clicky link the exact spot on the website, but it's www.basicresearch.com, under the left column Reference find Tech News, then Bridle Extension. http://www.basicresearch.com/

Some of the photos I glanced at looked quite complicated to me...I don't care to spend that much time rigging ropes unless I'm using them to tie Shotgun down for the evening. The pilot chute one was especially daunting!

Maybe you all are addressing some other issue than guaranteeing full deployment...perhaps like leaving nothing behind? In that case, I hereby shut the heck up.

Peace,
K

http://www.basicresearch.com/technews.htm#bridle
Nice setup Karen but can only be used at places were you can get the carabiner and rope back(like the superbowl)..IT DOES LEAVE the carabiner and what ever it were attached to...

As im jumping a special A here(180/165ft) and know i cant go up there again to get my eitems back and maintains people are up there each day,i use the carry on SL that ONLY will be left in case the SL hang up...which ill know as ill loose my SL(like the carabiner on Apex web)

Here is my very simple set up.

please look at the other post in the other tread i just posted http://www.dropzone.com/..._reply;so=ASC;mh=25;

can i order one from ya? :-)

We brainstormed this problem a year or two ago and came up with this which seems to work really well.

I have been building them out of Dacron and spectra. I have jumped it a bunch and it works exactly the way it's supposed to. Super clean, super simple, and very easy to rig up.

I will post pics of my setup in the morning (I'm at work) when I get home.

If you have some dacron, spectra, a finger trapping tool and a sewing machine you can build one in a couple minutes or I could build one for ya.

will that mean ill get the pics you promised the other day aswell

a thing i want you to give me the skills to do.. and ill ofcourse need a fingertrapping tool aswell

The only problem I see is if the lines get cought in something.

Take a look at this. It is basically the same set up but the longer loop is connected via a 2nd breakcord.

Dexter also said it were 2 years ago.. im sure he also use a "cutaway loop" aswell

Okay, here's a couple pics of my static line attachment for BASE jumping.

I usually just girth hitch the spectra to the bridle since the short loop of dacron entangling with anything is no more likely than the bridle and PC themselves. If it is still a concern, just attach the thing with a loop of breakcord.

Once the attachment is rigged to the bridle, loop the red dacron over the handrail or anchor object so that the white extension faces away from the object. This is so that when the breakcord parts the dacron will "whip" away from the object.

Tie the two ends of the dacron to the bridle with a single loop of 80 pound breakcord. When you tie the knot, take all the slack out of the loop of breakcord.

If you're doing a lower jump where you want redundancy you can add a longer loop routed through the same points, just make it long enough that the first loop must break before the backup loop can be loaded.

I use two different materials to build the SL attachment to reduce the chances of misrigging something in the dark. It's simple: tie the two red ends to the bridle and face the white part away from the handrail.

Any more questions or anything I can explain better?

I like that setup. Very simple and highly unlikely that you'll screw it up, especially if you use another loop of breakcord from the spektra to the bridle and a larger loop through the ends of the dacron for redundancy.

However, your third photo shows the dacron looped to the bridle with the breakcord, wouldn't it be better to have the dacron looped around the anchor held together by the breakcord and the spektra attached to the bridle via a seperate break cord? This would decrease the length of dacron that would have to be extracted from around the anchor, no?

Also, this is still a 96lb break force, correct?

The first photo is the attachment shown with my cell phone for scale.

The second photo shows the spectra tied to the bridle with a dedicated length of breakcord.

The third photo shows the dacron looped over the anchor point and the ends of the red dacron tied to the bridle with a dedicated piece of breakcord.

In that photo series, there are two pieces of breakcord being used.

The system is very effective with a downside of not being super abrasion resistant. I think the material to build one costs me several pennies and it takes about three minutes to make one so they're fairly disposable to me. I jump one until it starts showing a bit of abrasion damage then I just can it and make another one.

A positive aspect is that I can build it to a custom length to suit whatever object I'm using as an anchor point. If it's a handrail I use the short length in the picture. If the anchor point has more girth to it, then I can build a longer attachment in about the same time it takes me to stow my lines.

Thanks for the pics Dexter, I'm going to get one made and have a play with it.

Gus

Dexter,use a small carabin or better a conectorlink(thouse small metal things on your riser holding the lines down),at the brakecord on your bridel.. its simple to remove after the jump and that way you wont spill your expencive brakecord on a loop each time

As it never get any tension unless you get a hangup i dont think it should be a thing to worry about to reuse the breakcord like this(sorry the weather is crap here and my rigs are at home so i cant show pics at this point)

PC i still miss them pics of your pc you promised...