darkwing

Members
  • Content

    2,349
  • Joined

  • Last visited

  • Feedback

    0%

Everything posted by darkwing

  1. Some people are cutaway magnets. One such guy, experienced people would watch him pack, and just shrug, “yup I can see why he cuts away a lot”. A single cutaway in a thousand or two jumps doesn’t mean anything diagnostically useful. Someone cutting away several times in a few thousand jumps has something going on. It could be packing technique, maintenance problems, or experimental or particularly edgy gear. People commonly want something to blame every malfunction on, but not every malfunction has a blame-able factor. Remember, you are throwing a wad of fabric and strings into a turbulent, high speed air flow. Shit’s gonna happen. The reverse scenario, is worth considering too...for uncommon events (cutaways for people who have none of the aforementioned risk multipliers) there will be cases of people going much longer than average between events. That doesn’t mean (necessarily) that they have anything special going for them other than the luck of the draw. -- Jeff My Skydiving History
  2. darkwing

    New-to-market canopy

    Having a lot of experience building for the military market is a plus. Looking at the photos on the web site they have a range of models and sizes. Nothing about any of them looks exotic or innovative. I suspect they are very similar to many existing canopies, but you really need to have riggers and experienced jumpers have a look at them. You might ask them if you can demo the canopy. Or if a group of you can try it. If they want to break into the local market, then they should be eager to let people try them. Merely having good prices isn't enough. -- Jeff My Skydiving History
  3. As I recall, in the mid-1990s at a boogie in Boise, we did a test dummy drop using a reserve that had been packed and sealed for 50 years. It did fine. We weren’t surprised. It had been in a loft and someone found it. -- Jeff My Skydiving History
  4. “Sport Death” because I’m old school. -- Jeff My Skydiving History
  5. darkwing

    Cloud canopy

    what others said... But you can reline it, take out some reinforcements, put on a slider, re-do the bridle attachment, and generally make it lower bulk. A long time ago, like late 1970s we did that with a canopy from ParaFlite known colloquially as a baby-plane. We renamed it the "Scare-a-plane" and put some jumps on it. The bottom line is that it isn't really worth it, unless you just like messing around with rigging stuff and jumping a canopy that doesn't open or fly as well as a modern canopy. -- Jeff My Skydiving History
  6. darkwing

    Breathing In Skydiving

    I don't think any experienced jumper even thinks about breathing. I don't. If there is a problem I think it is anxiety related, which doesn't make it not real, it just means the solution is to convince yourself that there isn't a problem. At worst, that comes with a few more jumps. -- Jeff My Skydiving History
  7. darkwing

    Meat bombing

    I was on a 4-way team that had a guy more than 60 pounds (27 kg) heavier. He was also a tandem Instructor. I was about your weight. Yes, he wore a baggy jumpsuit, but you need to think more broadly. Are there some jumping situations where your size is an advantage? Yes. We did a lot of fun hybrid stuff over the years. -- Jeff My Skydiving History
  8. darkwing

    Help with airfoil/rib shape making a canopy

    I built a bunch (dozens) of canopies many years ago. I figured for the first one, the best thing to do was copy what I considered to be the best flying canopy of the time (a 7-cell 189 foil). It required much more intricate sewing than others I could have built, but I wanted to get the sewing down before I worried about aerodynamics. I still recommend that approach. I did a lot of seat-of-the-pants engineering and even my very weirdest canopy flew very nicely. It was a flat-rigged, double-humped, 5-cell, whose first jump was the day Mt. St. Helens blew up. We were in the air, watching the giant cloud of ash and lightning come toward us. I built it out of super cheap, really crappy (tear strength of about 3 pounds) but lightweight fabric. I just hoped it held together for at least one jump, so I could evaluate its performance. It flew and landed quite well I put a small number of jumps on it and sold it really cheap to a teammate, who put hundreds (I think) of jumps on it. It is still in a box somewhere. One of the problems with you diving into 3-D fluid dynamic simulations is that so many little details such as deformities at line attachments, seam shrinkage, dimples in the top skin, inflation of cells, lines, the jumper, etc. are hard to model. Sure, you'd get some insight to trying a bunch of variations in an extremely complex parameter space, but remember, lots of people have been playing with this stuff for decades, and you might, but probably won't, stumble on anything that hasn't already been stumbled on. BUT, it is about the journey, not the destination. My advice, don't get bogged down. Just design and build and enjoy. Also, don't die. Jeff -- Jeff My Skydiving History
  9. I was there too. I have often wondered, over the years, if USPA went to the trouble of archiving and converting such historical videos. I competed in 4-way, and very casually in 8-way (I think, but maybe that was just in 1978) and would love to see video of any of the competition events. I'd think someone at USPA would quickly be able to supply an answer. -- Jeff My Skydiving History
  10. darkwing

    Beagle Boogie Boys Chant

    I semi-remember it from the 70's, and I probably remember more of the 70's than nearly any other Idaho jumper of the time. All I recall of it is the ending, "... we're the Beagle Boogie Boys, who the fuck are you?" -- Jeff My Skydiving History
  11. darkwing

    Who is it?

    I keep hoping (or fearing) than some day one of these "who is it" posts will be me. -- Jeff My Skydiving History
  12. darkwing

    Anybody recognize this guy?

    Nicholas Cage? -- Jeff My Skydiving History
  13. darkwing

    Sewing machine stitch consistency help

    Please forgive me if I say that sometimes it is a problem with the hand of the operator. Light fabrics can require more finesse, especially on some machines. I'm not dismissing any of the mechanical comments made by you or others, but bringing up this issue, even if it doesn't apply to you, is worthwhile as a caution to other readers. -- Jeff My Skydiving History
  14. Yes, that song is used a lot. I like it. You don't. Both are allowed. The video is very enjoyable. A refreshing alternative in skydiving video. -- Jeff My Skydiving History
  15. God, I wish I had a sport death t-shirt. I'm sure I was never dorky enough to wear cut-off jeans. Oh, wait, yes I was. -- Jeff My Skydiving History
  16. darkwing

    tunnel-cracks organizing ff-biggerways - wtf?

    My take - In the sense that these things are all important parts of organizing -- • Botched exits, LO's fault. • Taking too long at the door, LO's fault • People landing in high speed area, LO's fault • People flying every direction, LO's fault. This is not to say that there isn't some shared blame, but if the LO doesn't hammer these in, the LO has done a poor job. -- Jeff My Skydiving History
  17. darkwing

    Why stow toggles on half brakes when packing?

    When you design a canopy, one of the things you play with is the brake settings for deployment. There can be a wide range of behaviors with different settings, and the behaviors are not the same from one canopy design to another. The original thought was to prevent canopy surge, and to make canopies open better. It is OK to still view it that way. Just don't assume you know what will happen with a different brake setting than your canopy came with. -- Jeff My Skydiving History
  18. I've probably paid for 2300 of my 2400 jumps. Some free demos, and a few other odd free ones. Your poll is probably too exclusionary given the "ALL" aspect of it. If you have been jumping a while, it is unlikely you haven't gotten a free one, one way or another, along the way. -- Jeff My Skydiving History
  19. darkwing

    Interesting cross port design...

    For a long, long time now I've thought it might be useful to just use a high porosity fabric, rather than port it. I certainly understand that a soft, uncoated, high porosity fabric might be harder to handle during manufacture, but it still seems worth trying. -- Jeff My Skydiving History
  20. darkwing

    Help: Can't buy beer!

    As a long time skydiver, and a longer time non-drinker, I applaud any non-beer options. Ice cream floats are great. -- Jeff My Skydiving History
  21. darkwing

    Parachutist Magazine, September 1979

    I might be able to help you, as I think I have that issue, but I don't think I want to part with it. Is there something specific you are looking for? I was at the nationals that year. -- Jeff My Skydiving History
  22. I used to own a Top Secret. The photos confuse me though. I don't recall they had a last hope rope on them or Martin Baker handles (which I still like more than most people). Either the handle shown isn't martin baker anyway, or my brains are scrambled ( which is likely). -- Jeff My Skydiving History
  23. darkwing

    Funny Skydiving Nicknames

    "Mark the Narc" "Crazy Ed" (there are many Crazy Ed's in the world. "Ganja" (because his last name was Weed) "Maplehart," or "Dougie Maplehart" (neither was related to his real name) "Wragg" because when your last name is "Wragg" you have an automatic skydiving nickname "Pilot Error" for one of our pilots Four of the six above are dead. Maybe we should avoid nicknames. -- Jeff My Skydiving History
  24. darkwing

    Birds and Skydivers

    About 10 years ago I tracked through a dispersed flock of white birds of some sort at about 4500 feet. Didn't hit one. Another time a teammate during a 4-way competition landed with some bird poop on the front of his jumpsuit. Never saw the bird. I imagine the bird had an emergency "evacuation" when my 300 pound teammate approached from above in free fall. -- Jeff My Skydiving History
  25. darkwing

    Odd parachuting activites...

    Pretty much any whacky thing you can imagine has been done. -- Jeff My Skydiving History