RiggerLee

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Everything posted by RiggerLee

  1. This is a good example of some one off the center of the bell curve where a larger or domed or flag slider could be handy. A better question is are the openings with dome sliders more consistent? That's a different question to whether they can fix a problem under those conditions. Let's say you plotted opening shock for a hundred openings. You get a bell curve. What we want is to avoid the out liers at the top end of the graph, they hurt. Their are a lot of decisions you can make in design, including slider size, that can shift that curve right or left. Keeping in mind that you don't want it to open too slow as well. Are domed sliders better? The question would be if they can tighten that bell curve. Make it narrower. Avoid the out liers at ether end. No more hard openings, no snivils, smaller standard deviation. There is no question that we can shift that curve right and left. That's what we have been doing with these after market sliders for years. We just needed a higher drag slider on some canopies for some jumpers. They will tell every one about how great it is because it fixed they're problem. That is not to say that it's a fundamentally better slider design. A problem we had with the canopies for our system here is that the manufacturer tryed to build the slider too big. It's actually more complicated then that, the damn thing has 22 grommets but the point stands. I built things like this for people for years but what I was doing was shifting the curve. I have no reason to beleve that it actually reduced the spread. So I can't say that a domed slider is fundamentally better then a flat slider. I can just get a bit more drag out of it. Lee
  2. RiggerLee

    Video and telemetry

    You might check out... https://dekunu.tech/dekunu-one#data They are Australian and no one can pronounce the name of the thing but it's an interesting unit. I was talking to them at PIA and it's a small INU with GPS, accelerometers, gyros, pressure transduicer etc. It's basically a little data logger but what is really interesting is the back end cloud software for analyzing and sharing the jump. Got a student? Let's see what your holding pattern really looked like. Where was every one relitive to that big way CRW formation as it built? How hard was that opening. I literally got mine yesterday so I have not had time to play with it but I cant wait to pull data out of it. You're supposed to be able to get the raw data from it as well. If you go to their web sight and scroll down to a video you can get some since of it. It's edited in with a lot of bull shit video like a toy commercial but there are shots of the interface as well. Looking forward to playing with mine. Lee
  3. Flat sliders are easier to build. You try to design some thing that you can build. You try to design the canopy so that you don't have to resort to things like domed sliders. There are some tandem canopies with slightly domed sliders. But you try not to have to go their. You'll see most of these things after market where people are trying to deal with a bad canopy that is prone to aberrant hard openings. Lee
  4. RiggerLee

    Thunderbow manual needed

    I never had a manual. What I remember is mainly about the crown lines. As I recall it splits into three sub bridles. You had to make sure that each of them was clear. From that point onwards I don't recall it being that diffrent from a PC in terms of flaking. I think their might have been some excess control line to be stowed at the cascade to take up the slack. I might be confusing that with another canopy. It was the coolest thing I ever jumped. Wish I could have hung on to it. As I recall the crow lines were the key thing in packing the canopy. Lee
  5. I doubt there is even a copy right much less a patent. Have any of them actually filed any thing? Lee
  6. That's a cool project. I may have to revise my opinions of the training in the modern rigging schools. Lee
  7. It depends on the complexity of the project. Having some thing to copy certainly helps. Coping peaces... you almost have to make pattern sets from them. Get the markings right. Order of construction. And then on the next one you're almost starting over from scratch. It's doubtful that they actually have any peaces in common. But yah, you could do it. You'd have to source all the materials and get good thread, etc. You could do it. But at that point I think some one could argue that the rigger is actually in business illegally coping other peoples suits. I really prefer the open source idea and the kit plane materials concept. You can buy plans for an ultra light. You can buy the materials kit for an experimental air plane. You can buy the parts kit. You can even buy the "quick build" kit. Lone Star could live again. Being here in the US is one thing. But lets say you lived in some back woods country or one with tariffs. Look at Quag and his canopy project. No canopy manufacturers in the UK and it's kind of pricey to buy one from out side of the country over seas. I'm surprised their are not more home grown builders popping up in some of these countries. Theirs another guy in south america. He's working on a pilot rig. It's hard to get them down their. Lee
  8. If you were to build something noncommercialy for your self, I think you would be fine. Copy rites and things protect the commercial exploration of a design. Or at least that is my understanding. I don't think any thing can prevent you from building things for your self. I think it could be argued that the rigger is stealing the design and selling it commercially if he accepts money to build it for you. Having said that. I could do some thing like this. I can do it because I have twelve different types of sewing machines lined up behind me and pallet racks of fabric to the left of me. So when I get board, yah, I do fucked up shit like that. But if even I set down and counted up the hours I had in one of these projects it wouldn't make since to do it. It's only practical if I'm idol and really board. Prices are getting out of hand. I think you will start to see more of this. Like the guys building their own canopies. Mostly for fun at first but once the idea gets around, who knows. I could see some open source drawings getting out and it turning into a little kit plane kind of thing. Then they will start selling quick build kits, here are the pre cut ribs and panels... Lee
  9. RiggerLee

    1 or 2 Pin AAD on 2001 Infinity?

    Their is absolutely nothing wrong with an honest question. Every one here will be happy to help you. Your questions tell us a lot about your experience level. Don't be embarrassed by that. We all start some where and the most important thing is that you are asking these questions. When we give you advice, like that you should spend some time with your local rigger learning about this or any gear that you are considering it's in that spirit of trying to help you. You need to sit down with him as he inspects it, takes it apart, see how it works, and how it's built. And their are limits to what you can learn on the internet. We will help you, There are good resources here but it's no replacement to working with it with your own hands. Your best resources are always the ones right in front of you. Lee
  10. RiggerLee

    1 or 2 Pin AAD on 2001 Infinity?

    Frankly if you know that little about it you should really get it sent to a local rigger to make sure it's the right rig for you. Their's more to this then just picking some thing out of an add column. Lee
  11. RiggerLee

    1 or 2 Pin AAD on 2001 Infinity?

    One pin if it's an infinity. 2001 implies that. There was an older Northern light that was a two pin. Lee
  12. RiggerLee

    Tandom baglock

    What kind of system? For example the strong drogue stays fully inflated and with only 25 0r 30 lb under it would come down very slow. Sorry don't have any kind of number. Vector on the other hand partially collapses on drogue release and wouldn't drift as far. Call the company, they might have a number on decent rate. Lee
  13. RiggerLee

    Shortening laterals

    Their are some local riggers that sew as well if not better then the manufacturer, and you don't have to ship it back and forth. But I'll tell you this, I wouldn't do it for $150 and I'm about as cheep as they come. $150 is a smoking deal and I don't know why you wouldn't take advantage of it. Lee
  14. RiggerLee

    Shortening laterals

    The better it fits you the more you will like it. The two of you are going to be together for a long time. I've seen rigs out live marages. You would like for the hip junction or ring to be at the point of rotation of your leg. If it's two far forwards of that point the main lift web shift upwards and will loosen when you lift your legs, like in a sit. The rig will lift off your shoulders in a sit and that slack will allow the rig to hinge up off your back. This can range from annoying to dangerous. In the worst case you could in theory roll out the back. That has happened with a couple of badly fitting student rigs but it can happen with sport rigs if the lateral is too long or particularly if there is a lot of stagger and a small rig fits high on their back. There are people that can bend over and slide their rig off their shoulders over their head. Incut lats help with this. They do not loosen as much when the main deploys. So the measurement stays consistent. Got to go to work. Lee
  15. RiggerLee

    Shortening laterals

    On a Javelin the lateral crosses the back, loops around the webbing and goes back under the back pad. To make that loop shorter you have too pull the harness, zig zag, and where the back pad is sewn down on the side too shorten it. Easiest thing to do is peal up the bottom of the tray so you can get to every thing and just replace that whole strap. You're basically taking out all the stitching through it. Why sew through the same peace of webbing? It's by far the easiest way. Lee
  16. RiggerLee

    Shortening laterals

    They will be peeling lose the bottom of the main tray, replacing that piece of webbing, resewing two junctions... It's a great deal. You wont beat that price. It's worth the price of disassembly, shipping, etc. Insure the shipment. UPS loses shit. Lee
  17. RiggerLee

    Built in turns

    It's hard to make small changes by tieing a knot. You can finger trap peaces of line into the suspension line to shrink it. It's an easy way to fine tune things. Lee
  18. RiggerLee

    Built in turns

    It sounds like it's built into the fabric. This can happen. They go to great lengths to inspect the fabric and avoid biased rolls, and they flip panels, and other things to try and avoid this but some times the tolerances stack up and you get a canopy with a turn. Their are no good ways to fix it but there are some half assed ways. First try pulling the slider down and letting your chest strap out. It's a small thing but the more curved the canopy is, the closer the risers are together, the more twitchy they tend to be. It just exaggerates the problem. Letting it expand may make it less noticeable. Some thing else you can do, you can't fix the canopy but you can induce a turn the other way. You can do this by intentionally fucking with the symmetry of the line set by changing the trim of one side vs the other. But if you don't to get that adventurous the easiest thing you can do is to extend the full line set on one side. Sounds strange, but we all know that if your harness is asymmetric, one side slips, that it will cause a turn. If for example you add a second set of links to one side of the canopy, both front and back, you have now built a permanent asymmetry into your rig. So you have a permanent 1.25 inch harness turn built into your canopy. In this day in age, you might just have some one build you a pair of longer slinks for one side. It will look goofy. It will freak some people out. If it works you could even shorten the lines on the other side to make it less noticeable but this is the easiest way to half ass fix it. Lee
  19. Impressive. They must really be on top of their maintenance. Lee
  20. RiggerLee

    Dealing with high shock loading

    A low placed RSL ring through the bottom loop only helps if the bottom of the riser stays with the rig. People keep talking about risers breaking at the grommet hole but oddly the majority that I have seem break snapped at the tape of the third ring. I mean that tape broke. This means that the whole riser released. This is 3 out of the 5 I've seen break. One did break at the grommet and one broke at the front riser. Snaps, magnets, or just rubber banding the center of the slider up to one of the attachment points certainly helps to avoid the occasional brisk opening. I don't think this is a bad thing at all. I don't think it's a solution to the explosively hard openings that break things and kill people. We're not talking about some thing that leaves you sore. These are like an order of magnitude higher. I don't think they are a product of the riser creeping down. I think they are the result of a much grosser failure of the staging of the canopy. Like Dennis. I figure he got one riser caught under the corner of his tray on that sit fly deployment. This difference in length means that one side of the risers and there fore the slider was pulled down about 4 feet lower then the other. One side could almost fully open unhindered and then the riser pops lose and the canopy is fully open. It was a specter if your curious, not that it matters with some thing like this. I suspect sever out of sequence openings, bag dumps played a part in some others as well. That's why I'm comfortable talking about a weaker riser or other fail point. The magnitude of the peak forces are way beyond the change due to wear. Lee
  21. RiggerLee

    Dealing with high shock loading

    Yes it was a thing. There were a few canopies that tried to use it. It doesn't work very well. The PC is in the burble of the canopy and provides inconsistent drag and the line burns up the canopy as it passes through. Solid sliders that block the wind into the canopy work much better. Good thought, but it turns out that it doesn't work well. Lee
  22. RiggerLee

    Dealing with high shock loading

    I think nether. It was staging. The change to micro and ZP created staging issues. Packing practices that worked, or that we go away with, on dacron lined f-111 canopies would not work with the new materials. And although they came out together they were not necessarily used together. we saw f-111 with micro and ZP with dacron. Lee
  23. RiggerLee

    Dealing with high shock loading

    Turning the riser into a fuse is basically what we are talking about. I'd say build lighter slinks but they are much more of a wear area. The riser leg is less of a wear and less prone to change over a reasonable life span. This problem has come in waves. Once we had good sliders and good staging the problems of hard openings was basically solved. Then as micro line and ZP showed up it reared it's head again. Now as fall rates pick up with free flying we are seeing it again. Lee
  24. RiggerLee

    Dealing with high shock loading

    It wouldn't and it doesn't do so now. It shouldn't be too much to ask for people to replace their shit when it wears out. And yes that's a problem now as it is. I don't think the over all life span would change that much do to wear. The areas we are talking about are not the wear areas. There is much more wear around the three rings. All of the failures I've seen on third ring tapes and grommets have been on older risers. Interestingly, the risers I saw break above the junction were almost new. So in an asymmetric opening most of the load on the right front riser it failed the riser above the junction before it broke the three ring or grommet. So with a brand new riser, built properly, correct dimensions, I think the strength of the three ring is greater then that type 17. But as the three ring wears it drops below the strength of the riser and becomes the failure point. What I'm suggesting is that we build the riser such that the leg, which isn't the main wear point, would remain the weak link through out it's expected service life. Looked at from that perspective It wouldn't be that much weaker then a used riser.