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Showing content with the highest reputation since 05/24/2021 in all areas

  1. 7 points
    OK. Bill, I'll own that and apologize to the group. Not the impression I was trying to give, but obviously missed the mark.
  2. 6 points
    WE KNOW! IT's from THAT day. EVERY time - THAT DAY. You keep posting the same hyperlink. For that day. This is exactly what pisses everyone off. You pick one data point out of trend and celebrate that data point like a five year-old that's discovered he can write his name in the snow while peeing.
  3. 5 points
    RSL is a lanyard connecting one of the main risers and reserve ripcord (and MARD if it's there). Once the reserve canopy is open, RSL doesn't have any function, but it still exists connected to the main riser. In case you have two canopies out and decide to cutaway the main, you will still have a lanyard dangling from the main riser which can get caught in something (for example, it could whip and wrap around the reserve risers). Disconnecting it reduces/removes the chances for this.
  4. 4 points
    Brent is a troll. I don't know why anyone is still feeding him.
  5. 4 points
    Tests have been done over the years but little by individual jumpers as opposed to companies. Just whipping this post off: While GPS data is easy to get these days, you would still need to do some analysis to get good data out of it. It is hard to find "no wind" conditions all the way up to altitude, so you are going to have to take data acquisition runs in different directions, ideally up and down wind, to help calculate out the wind's effect. Plus, for any observed rates of descents and airspeeds, you'll want to do all your tests in similar conditions to avoid density altitude effects messing up your numbers. At least if you measure on a similar temperature day (across the air mass and not just on the ground), and at similar altitudes, you could compare canopies, even if they are not the 'proper' numbers as one would have for an airplane. That is, airplane flight data is always adjusted to be what it would be at sea level, International Standard Atmosphere conditions (29.92"Hg, 15 deg C), that sort of thing. So if measuring canopy speed and rate of descent at 6000' on a hot summer's day, it'll be faster than if measured at 3000' on a cooler day, in a predictable way. If all this goes over one's head, then one isn't ready to do accurate comparisons of flight characteristics of different canopies. ... Still, it can be fun to go up and get a little data just for fun, comparing different canopies for some rough numbers. Back 15-25 years ago I did a bit of data collection on a few canopies of the era, using a calibrated anemometer, electronic variometer, and a whole bunch of data reduction (analysis) to take into account density altitude effects. So the canopy types are a bit old now! -- and I'm not including modern competition style swooping canopies like a Leia or Valkyrie. This is a very quick summary that I used in a canopy flight course I have sometimes given, to give people some "rough numbers": From my testing. (These numbers have been adjusted to sea level standard conditions... because that's how it is done in aerospace engineering for comparing airplanes in a standardized way. On a typical summer day at a typical dropzone, at a typical height above sea level when flying one's canopy, the air density will be somewhat less. The Glide Ratio won't really change, but the Airspeed and Rate of Descent will be a little higher.) - Glide ratio typically: (brakes off) 3 student canopy 2.5 medium modern ZP canopy 2.1 small canopy In partial brakes, my Icarus FX 88 at 1.9 loading went 2.1 to 2.8! (lowered the rate of descent a lot, while only moderately reducing the speed) (While big F-111 canopies might just get less glide angle with brakes, with less effect on their already slow descent rate) (Sabre 1 135 when adding brake: got only bit better glide ratio with a bit of brake, then a lot worse as one got into heavy brake). Different designs could be more efficient… e.g. a special experimental high glide ratio 11 cell 170 from PD over 20 years ago that I jumped = 4.5 glide ratio in slight brakes - Airspeed: (Bit more than Forward speed horizontally) 25 mph student canopy 46 mph small crossbrace @ 1.9 loading (Icarus FX) But: Deep brakes only 25 mph - Sink rate: 800-1000 fpm big canopy (13-17 fps) for students or novices (On the lower side of that for modern ZP student canopies compared to ones like F-111 Mantas) 1300 fpm Sabre 1 135 @ 1.25 loading 1750 fpm (29 fps) small crossbrace @ 1.9 loading (Icarus FX) In brakes any of those down to only 750 fpm (So one can have the case of an instructor under a crossbraced canopy, maybe not a modern competition style one, being able to almost stay with a student or novice flying full speed under their rental canopy.) Note that glide ratios are only partially affected by the design of the canopy itself. Certainly a fat Parafoil with giant nose openings will be draggier than a modern highly elliptical swooping canopy with small nose opening and crossbraces for holding the shape well. Much depends on the trim the designers have chosen, nose up or nose down. That's why many swoop canopies are so 'ground hungry', trimmed nose down for more speed to use for a long swoop & flare, not just floating around in the sky. Another big factor is jumper size relative to the canopy. Scale the same parachute design down, and keep the same sized jumper under it, and now that jumper is in effect a larger draggy object below the canopy, dragging back from under the canopy even more as the speed increases with a smaller canopy. I saw some manufacturer test data way back that certainly showed the effect: Same canopy design at the same weight had a much worse glide ratio as it scaled to smaller and smaller sizes. - The PD info in a youtube video that BMAC posted is good, comparing a Pulse and Katana 150 at the same loading. Note that it looks like the data hasn't been adjusted to sea level standard conditions -- it is just the data they got that particular day and speeds would be slightly faster than in my type of data. Still a great comparison -- You can see how with brakes set, the Katana and Pulse are only somewhat different. Pop the brakes and now the Katana is super ground hungry in comparison.
  6. 4 points
    Jerry -- I have read through the entire thread, and see where it has gone. While I, in no uncertain terms, totally agree with what this valedictorian ultimately said, I'm going to have to disagree with her tactics. Yes, I agree with her message. Yes, I agree with her passion. Yes, I absolutely agree that this law is dangerous and hurtful. But those are similar arguments for anyone who wants to pull the same stunt to speak out about other issues. Notice the spirited debate this thread has sparked. Imagine if she had used this tactic to speak against parents allowing gender transition for pre-teens? Just because we agree with her doesn't make her any less brave than the religious teen who slips in a speech about their god instead of the programmed remarks. Personally, I think the issue of irresponsible TV and media abuse is also a serious, worthy, and courageous topic to address in these out-of-control times. It affects the health, well-being and prosperity of our country and the possible survival of the republic. Again, though so many of us do agree that her final topic is worthy of national attention, so is her original topic. If we let her go without consequences for this tactic, it opens the door for any kid with their own issue to do the same thing.
  7. 4 points
    Any here I thought you just wanted to come here to talk about skydiving.
  8. 4 points
    Which is unconstitutional. (And you're wrong. The ad was requesting chaplains, the application form was demanding Christians) Yes, it's specifically unconstitutional. If you want to get sued. Guess what, they're being sued. You are living in a fantasy world. Not only would multiple Christians be suing, it would be the headline news story on Fox, OAN, Breitbart, NYP for months and they'd be billing it as the death America as we know it. And you would be in full agreement with them.
  9. 4 points
  10. 3 points
    Actually, the AAD is located at the bottom of the reserve pack tray. The thing at the top is just the control. I've never heard of an issue with the magnetic slider keepers, riser covers or D-bags. I would expect that slider keepers and riser covers would have less chance of an effect than the D-bag, because the D-bag is a lot closer to the actual AAD unit.
  11. 3 points
    This is why taking a knee during the anthem is such a disgrace.
  12. 3 points
    Substance eh? Your problem Brent is that you endlessly throw out quotes and references to the positions that you hold. Yet there is never any substance to what you reference. You either move the goalposts, ignore the more pointed counter-positions to your arguments. Or most commonly pretend as if you're right all along. Why you bother with your global warming position can only be put down as trolling. There are many, many issues to criticize President Biden and democrats on. Regurgitating FOX talking points is never successful because they have no fundamental analysis behind them. Perhaps if you broadened your conservative information sources your analysis would get deeper. Until then get used to the label. Because John is right. You lack any substance in any of your positions of debate.
  13. 3 points
    I don't live in CA or AZ. It doesn't affect me, so why should I care? So what if the pecan farmers can't grow their crops. Pecans suck anyway. We should all move to eating walnuts. If CA wants more water, there's this giant ocean right off their coast. Plenty of water there for everybody. And who really cares about ski resorts. Skiing sucks. It is cold out when you go. Many people get injured every year. There will still be snow in Canada, if you really must do it. I've never been skiing in my life and don't plan on it in the future. It doesn't affect me, so why should I care? What I can't live without is my car. My lawn mower. A way to get around to my job. All the appliances in my house. If a few people in CA and CO have to change their life slightly so that I don't have to change mine, so be it. It is just weather anyway. I mean really, there wasn't snow in CO when the dinosaurs were around and that was WAY before the industrial revolution. And I'm too lazy to go look up that stat so I will just say it with authority so that you all will believe me.
  14. 3 points
    In this case, on that particular platform, I'm fine with her going off script. And, just to be clear, I'd also be fine with a HS valedictorian going off script on any subject they are passionate about. The typical HS graduation speech wouldn't get this kind of attention. Even one that went off topic and onto a controversial subject. If it was something bigoted & hateful (as your anti-trans example), it would get a fair amount of criticism. Any HS valedictorian has worked long and hard to reach that goal. While I mostly doubt that a big part of that goal is to be able to stand up in front of a couple thousand people and tell them 'what's what', it's one of the privileges. I'd be more upset if the school had chosen to shut the mic off and silence her. That also goes for stuff I don't agree with. The actions by the American Legion to shut off the mic during the section of the speech that lauded the freed slaves who's actions were the beginnings of the current Memorial Day holiday were far, far more insulting and offensive (this was posted in the 'deplorables' thread a day or so ago).
  15. 3 points
    I am fully white and raised in a white neighbourhood by white parents. Not sure why that would preclude me from protesting against racism in your opinion. It is honestly a pretty racist thing to say.
  16. 3 points
    Some people you can argue with, exploring and ventilating a topic. Others you can only argue against. Wendy P.
  17. 3 points
    Veis thank you for providing an image that illustrates the real issue of this thread. This thread went wrong, not productive when the debate started about equipment or what could/should have been the proper course of action made by NWT. The thread should be focused on the management of the excess break lines and how well they were not secure and then show methods on how to improve securing the excess break line that can help prevent this type of unusual malfunction.
  18. 3 points
    We lock the line by the textile rubbers and the tip of the loop by the lower tongue of the toggle
  19. 3 points
    Id advise against in air rigging and going lower than necessary. If you've made the decision to chop - then chop. One thing you can never have enough of is altitude. Would be shitty if you ate up 6k of altitude then had to deal with something on the reserve that required time and altitude. Keep it simple.
  20. 3 points
    That's the similar logic that says anti-perspirants cause lymphatic cancer. Or for the vet tech who refused to use lidocaine on my cat's skin five minutes before doing a fluid infusion for fear some of the cream would get under his skin once the needle was inserted. Some injections sting because the vaccine being injected is not compatible with raw muscle tissue. Just like other injections hurt because the viscosity is very high and their injection increases the pressure in the tissue (gamma globulin, anyone?). The alcohol dries before the needle is inserted. That trace amount that might get pushed in by a 25- or 23-gauge needle is insignificant and won't cause a stinging sensation. [/end rant] (sorry, those kinds of myths get under my skin. All pun intended)
  21. 3 points
    Except that you’re paralyzed below the knees and jumping out of an airplane. That’s by definition badass. Wendy P.
  22. 3 points
  23. 3 points
    After a 14 year layoff, I made my first jump yesterday, due to a hanggliding accident that left me paralyzed below my knees. I jumped a PD Navigator 280 just fine. Is there a better canopy out there with a smaller pack volume that has a powerful flare/stopping power??? Looking to purchase gear that will work with my disability. And go!
  24. 3 points
    Hi All Not sure if I've written this in the right place but hope everyone whose commented can see it. Returned yesterday felt a lot more confident and got through levels 2 and 3 without any issue. Was nervous going into the level 2 jump but after leaving the plane and stabilizing started to really enjoy it. Was less nervous going into level 3 but obviously they were still there, again really enjoyed the jump. I understand these levels are pretty straight forward but getting through these was a pretty big step for me. Thanks so much to everyone who commented and gave my the confidence to give it another go.
  25. 3 points
    It's a sign of how moronic the man is that I had to check quickly if that was a satirical site.
  26. 3 points
    The whole point of AFF 1 is to get you over the sensory overload. You’re not expected to be perfect. You also wouldn’t have hit the ground if you’d not pulled as you instructor would have pulled and, failing that, you have an AAD. Stop moping around and book in your level 2 jump.
  27. 3 points
    Really? So your Tesla short was based on your own proprietary research that showed the majors entering in a more substantial way? Please do share your data lest some here think that statement was unadulterated bullshit.
  28. 2 points
    In what time period did the person in question make the 30 skydives? There is difference in getting recurrent after 40 days for someone with 30 skydives all made in 2 months and 30 skydives made over 3 years.
  29. 2 points
    So after a week of back-and-forth emails, here's what I have: A porosity test is required. Anybody with a porosity tester can do the test. There are no special qualifications for the tester, no calibration standards for the equipment. The porosity test must be done at least twice (to get a "mean average"), but maybe more, one of which must be the center cell. All the tests are "normally" done 12" from the nose on the top surface. If there are normal places, there must be alternative places, but these are not specified. The center cell reading can be an indeterminate amount higher than 3 cfm, as long as the average is 0-3. If the average is higher than 3, there's nothing to prevent you from doing additional tests until you can get the average down to 3 or lower. If you are happy with the results of your inspection and the porosity test, you can put the canopy back in service for at least one pack. After that, additional packs/jumps might be authorized, but I never got an answer to repeated questions about the correlation between porosity test results and additional packs/jumps. No new scorecard on the canopy required, so no way for the next rigger to know if the porosity test was done or what the results might have been, or how many additional packs/jumps might be authorized. Findings should be recorded on the data card, even though there is no data card retention requirement in the US, and the data card is not a maintenance record in the US. Findings should also be recorded in the rigger logbook.
  30. 2 points
    I am not sure that the fact that we have spring loaded PCs for reserves is a good argument for defending them for mains. Reserves are special in a few ways: - AADs need to be able to activate the opening sequence, so you need the spring loaded PC for that, no way around it. - They are most of the time activated after a cutaway, more often than not caused by a spinning main and activated via RSL or MARD, so the large burble created by a wingsuit or a balloon suit are simply not there. - The PC does not stay connected to the canopy. Different use cases and boundary conditions, so different solutions. I am quite sure that if wingsuiters start relying on spring loaded PCs we'd start seeing soon a lot of videos of PCs being sucked in their burble.
  31. 2 points
    Funny, it kinda seemed like you thought what Europe is doing meant something when you started this thread yesterday. If you’re now saying that what Europe does is irrelevant and therefore your OP is pointless then I guess the thread can end here.
  32. 2 points
    Yet all if those denigrating ripcord and spring loaded pilot chutes for wing suiting rely on them to save your ass when you can't get the throw out handle? Hmmm. Many wingsuiters if not going to wingsuit specific canopies are going to triathlons, spectres, original Sabres. Canopies very much like those used by students with ripcords still at some dzs and for many years before most moved to throw outs for students. These canopies may not be as fast with a pc dragging, but also for a couple of decades we didn't have or didn't routinely use collapsible throw out PCs. So we were dragging an open PC on an 8ft bridle. Sounds familiar. Put the spring loaded PC on a long bridle and it would work just as well. Might there be issues with a long bridle trailing? Yeah. But no more than not finding a handle and using your last chance to live, which happens to be a ripcord.;) The main reason folks got rid of spring loaded PC's was the effort required to close the smaller containers and that it didn't look as cool. For many years we believed that the throw out still had to be visible. Belly bands, front of leg strap rear of leg strap all came before BOCs. Which was still a change in paradyme in not being able to see what opened your parachute. Is a throw out BOC best for a lot of skydiving? Sure. Maybe. Does a ripcord still work? Yep. But when we want to save our life in any situation we use a spring and a ripcord. And wingsuits with more and more rigid arms may need a thumb operated electrically released spring loaded PC. Or spring launched throw out like the T11 chest reserve? Hmmm. Rant off.
  33. 2 points
    USPA says you should make a jump with a coach or instructor. Seems typically a check dive is what is done. So you get stable after exit, get unstable(flip/roll), get stable again, maybe some 360s and or other basic tasks. Maintain altitude awareness and initiate breakoff at correct pre-decided altitude. Track away and pull. May be different depending your country/dz/governing body regulations. I'm no expert on this, but it's what I've experienced and see/hear.
  34. 2 points
    I think you're right that John is looking at the Bush era with rose tinted glasses, but there's elements of both. On a personal level he genuinely does seem to be a decent man, but that doesn't take away from his horrendous political decisions. He may have convinced himself it was for the good of his country but 100's of thousands dead in Iraq and the surrounding area (never mind the rise of ISIS) from a war he started under false pretences and the full embrace of torture as a tool of the state alone were morally bankrupt choices he has to take responsibility for. I think the idea of him as just a convenient stooge for Cheney and Rumsfeld et al is both too charitable and an underestimation of his abilities.
  35. 2 points
    We moved away from them because heavy PC's launching directly behind your back when you are belly to earth tend to get caught in the jumper's burble and sit there for a while. Note that wingsuiters do not have that issue. However, wingsuiters DO have the issue that they have a very large suit that can sometimes get between them and a throwout PC. "But everyone else does it" is not the greatest reason to stick with something. Everyone used plain old RSL's until Bill Booth came up with the Skyhook. And thus create the possibility of whole new types of malfunction, where the bridle is misrouted and trapped by the suit, or the suit/container interface is not great and the pin is pulled prematurely. It can work but comes with new risks. Similar things happened when belly band hand-deploys were common. (I'd be tempted to say "going back to a deployment system that failed is insane!" but I trust you will see the issue without that comparison.)
  36. 2 points
    Do you mean stuff like Project Exile? In the late 90s, Virginia, mainly Richmond started a program where people who used a gun in a crime faced enhanced punishment. One big change was that the 'gun charges' weren't plea bargained down. When it became clear that this was going to be followed through, gun crimes dropped. How about punishing 'straw purchasers'? Those are the people who can legally buy guns and do so for people who cannot. One recent prominent one is the guy who bought the rifle for the underage Kyle Rittenhouse, who then used it to kill 2 people in Kenosha. The straw purchaser has been charged and is facing significant time. One thing that should happen but rarely does is prosecuting people who can't buy firearms but try to. A false statement on the 4473 application to purchase a gun from a FFL dealer is a crime. It says so right on the form. The folks who are in favor of background checks always love to proclaim how many ineligible people were denied their purchase, but never seem to care that virtually none of them are prosecuted. I know a few are unaware that they shouldn't have a gun, but that's a pretty small number. You want to 'get tough on illegal gun purchasers'? Get tough on those who try to get a gun.
  37. 2 points
    I can assure you that the woman's commitment to a pregnancy has more impact than a man's does. I'm a woman, and I've been pregnant, and I've had a baby. There are more health impacts, more job impacts, on the woman than on the man. Period. And, yes, there are so many denying the reality of and responsibility for the children they've created. Most of them are fathers who don't want to be bothered. Until they're born, they're not children, any more than fertilized eggs are chickens. They deserve respect and humane treatment, but often the needs of the mother are in conflict with the needs of the child -- especially if she's pregnant without its having been planned. Until they're capable of being alive outside the womb, they're a far bigger impact on the mother than on the father. She is the only one providing physical support to the pregnancy. Until the pregnancy has attained the age of viability, it should be her final decision, preferably with him being involved in it. Of course -- when the father cuts out, he generally doesn't involve the mother, does he? After the normal age of viability, I honestly believe that exceptions should be made for non-viable fetuses, along with mother's health concerns, as well as the rape and incest exceptions. People involved in those situations are compromised already, and may be in situations that are dangerous enough that getting an abortion early isn't reasonable. Wendy P.
  38. 2 points
    As a third party observer... nwt and BMAC, I think you two are needlessly seeing your exchanges as an argument. I don't think your posts are conflicting, I think they are complementary. nwt, I don't think you're wrong in assessing your incident. BMAC, I don't think you're wrong in assessing other factors that contributed to / might have prevented it. Informative reading from both sides. On another note, nwt, is your reserve still airworthy as a reserve? All that UV exposure... (Yeah, I'm joking. Sort of.)
  39. 2 points
    Could it be possible that a high school valedictorian has more guts and brains than Greg Abbott?
  40. 2 points
    What is your feeling about (to go back to the skydiving analogy) someone who swoops the beer line at a demo and takes out a couple of spectators? It’s his freedom to swoop, after all. And that person (let’s say with claustrophobia) who just can’t stomach a mask; are their rights to be out and about more important than the bus driver who has his immune-compromised mother living with him? And as far as evolving information, I see that as a feature. I know that my understanding and decisions change as I gain more information — don’t yours? Wendy P.
  41. 2 points
    Guys, there’s been a lot of good exposition here. Wendy P.
  42. 2 points
    What the hell? No, please don't tell people to use spring-loaded PCs for anything, the one and only place they belong in is the reserve tray. We moved away from them for a very good reason, and saying "but maybe we should go back to spring-loaded PCs in the discipline where that original reason is most pronounced?" is insane. Pretty much everyone uses BOC throw-outs for everything, aside from CReW people who sometimes prefer pull-out, and some places (including DFU, the Danish Parachuting Union) actually mandate throw-out for wingsuiting. With the burble a wingsuit creates, throw-out is the least risky method. And for wingsuit specifically, it's possible to have the throw-out pouch integrated in the suit itself, moving it away from the BOC and into the armwing, but that's more of a BASE-specific usage.
  43. 2 points
    Maybe the troll should be suspended.
  44. 2 points
    How else would people know how patriotic driving in a constant left turn is?
  45. 2 points
    It would be interesting to see if there's any overlap between those who think getting a shot is an infringement on their personal freedoms, and those who think all 18 year olds should be forced to do some kind of national service.
  46. 2 points
    No, they would probably storm the Capitol.
  47. 2 points
    Suit yourself. But it makes your posts harder to read and diminishes the weight given to them. Of course that doesn't really matter to the path of your life.
  48. 2 points
    I still have my 1983 Warp 3 by National. While it is a really poor design, there is nothing about the container condition itself that makes it unairworthy. It probably had 5-600 jumps on it when I stopped jumping it. I packed it a number of times during my rigger training in 1997. The canopies that are currently in it however are a whole other story!
  49. 2 points
    If interstate highways are so great, why do they have to bribe us by letting us drive on them for free?
  50. 2 points
    I started skydiving/AFF at the Champaign-Urbana Skydiving Club last fall when I was 18 then finished out my A-license in January in the student training program at Skydive Spaceland Houston. Since then, I've been skydiving with the UIUC Falling Illini Collegiate Skydiving Team as the (currently) only girl and travelling to Chicagoland Skydiving Center on the weekends to get more altitude and larger formation jumps. I've been thrown into a nuclear lake, hit jump number and freefall time for my B-license, and gone through ground school for the canopy course. This summer, I'm hoping to hit my C-license and make some hot air balloon jumps. Eventually, the goal is wingsuiting and BASE jumping. Now that I'm travelling to more dropzones and have enough tunnel time and training experience to begin more advanced diveflows, I figured it's time to introduce myself and get to know more of the community. I'll be tenting Friday-Sunday at dzs across Missouri + a few neighboring states this summer, so if you're located at any of those areas and want to get some jumps together feel free to reach out! I'm also open to US dropzone recommendations and meeting other USPA Collegiate Nationals competitors, so if you're planning to enter this year (or need extra team members) let me know! Blue skies! -Kathleen Beetner, ig: @kathleens_shenanigans
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