mailin 0 #1 September 22, 2003 what is the g-force argument with skydiving? Its obviously not the same as amusement park rides... I'm trying to get around a problem and would like to get peoples opinions. Thanks JenniferArianna Frances Quote Share this post Link to post Share on other sites
freakydiver 0 #2 September 22, 2003 What "argument" do you speak of?? -- (N.DG) "If all else fails – at least try and look under control." -- Quote Share this post Link to post Share on other sites
airdweller 0 #3 September 22, 2003 Could you elaborate on your thought? I know you can increase the G-force exerted on you by spiraling your canopy------------------------------------------------------ "From the mightiest pharaoh to the lowliest peasant, who doesn't enjoy a good sit?" C. Montgomery Burns Quote Share this post Link to post Share on other sites
mailin 0 #4 September 22, 2003 I'm not exactly sure.... I'm being told by the manufacturer of my pacemaker that their concern with skydiving is that the g-forces could move the device. On my tandem I didn't feel any kind of pulling like on an amusement park ride. Just wondering I guess - I have a feeling I'll be getting horribly bad news in the next few days. Jennifer who feels like she's going to start crying now...Arianna Frances Quote Share this post Link to post Share on other sites
schattenjaeger 0 #5 September 22, 2003 Umm...they go up a split second when the chute catches ya, and if something malfunctions and you get locked in a spin, you'll pull a few. Beyond that, they're negligble. Roller coasters drop you, and while still accelerating pull up suddenly, and then while going up, will crest hills and go down again(give you negative g's)and make high speed tight turns. Quote Share this post Link to post Share on other sites
billvon 2,822 #6 September 22, 2003 >I'm being told by the manufacturer of my pacemaker that their >concern with skydiving is that the g-forces could move the device. The place to worry is during opening. A normal opening is 1.5 to 2 G's, a soft opening is barely over 1G. A hard opening can hit 10 G's. Unfortunately, there's no way to guarantee you won't experience a hard opening; even the softest opening canopies have "rouge" openings sometimes that can really slam you. Quote Share this post Link to post Share on other sites
mailin 0 #7 September 22, 2003 can I ask what 10 Gs would compare to... like a winding rollercoaster would be ____ G forces What would 10 compare to? Thanks JenniferArianna Frances Quote Share this post Link to post Share on other sites
schattenjaeger 0 #8 September 22, 2003 Humans start blacking out anywhere over 4 Gs(that number gets higher for different people, fighter pilots for example, have a higher tolerance)rollercoasters probably hang around the 4 G or less, maybe occasionaly poking up to 5 or so for a second. Sustained 4-5Gs will black you out pretty quick, but roller coasters don't sustain them. If you have a hard opening, you'll only be feeling those Gs for an INSTANT, but think about it. 120-15 in under a second. Yowch Quote Share this post Link to post Share on other sites
mailin 0 #9 September 22, 2003 I'll be presenting information to my doctor when I return from vacation next week. I want him to be very informed and not make a decision based on bias - which is a normal thing for anyone, not just doctors. The two things he'll be worried about are device, lead dislogment and pressure on the device from straps. Where can I find information that would explain how skydiving would affect these things - I'll search far and wide for the information. I don't want anything to keep me from this - let alone something I didn't ask for in the first place... thanks for everyones help. JenniferArianna Frances Quote Share this post Link to post Share on other sites
Fast 0 #10 September 22, 2003 Just a thought, but you may want to ask one of the container manufacturers if they have any data on this. They are the ones that have to build the harnesses to take the stresses involved in deployment and turns, etc. You could try, RWS, Mirage, Sunrise Rigging, etc. They might give you somewhat better of an idea of the forces expected durring a skydive.~D Where troubles melt like lemon drops Away above the chimney tops That's where you'll find me. Swooping is taking one last poke at the bear before escaping it's cave - davelepka Quote Share this post Link to post Share on other sites
mailin 0 #11 September 22, 2003 Great idea - thank you. JenniferArianna Frances Quote Share this post Link to post Share on other sites
billvon 2,822 #12 September 22, 2003 >can I ask what 10 Gs would compare to... In New Jersey, roller coasters are limited to 5.6 G's for safety reasons. Fighter pilots can endure 8 G's for a short time while staying conscious. G-forces alone are a poor indicator of stress, though. You can generate almost 10 G's for a very short time by plopping down on a wooden bench. A true 10G opening in freefall lasts a little less than a second, so it's worse than the bench-sitting event but not as bad as a pilot pulling 8 G's for ten seconds. We perceive hard openings as sort of an impact, as if you'd jumped off an 8 foot ledge. You may ask about it in that way; see what impacts are contraindicated (i.e. if you have to be careful about playing rugby or jumping in place.) Quote Share this post Link to post Share on other sites
Vertifly 0 #13 September 22, 2003 OT: Is that a siamese or burmese cat in your picture? Quote Share this post Link to post Share on other sites
billvon 2,822 #14 September 22, 2003 >Just a thought, but you may want to ask one of the container >manufacturers if they have any data on this. Talked to Sandy Reid a bit. Harnesses can generally take 4000 lbs with no problems; this corresponds to a 20G opening, which most people would consider very painful. Above 6000 lbs there begins to be a good chance of rig failure, and thus questions of whether a pacemaker pulls free become sort of moot. Generally such loads are not seen unless you have a big guy who deploys his reserve while in a head-down or something. Sandy recommended talking to Jim Crouch at USPA; they may have some historical info on pacemaker use in skydiving. Quote Share this post Link to post Share on other sites
mailin 0 #15 September 22, 2003 Siamese - my baby boy adopted from www.siameserescue.org Thanks for noticing! JenniferArianna Frances Quote Share this post Link to post Share on other sites
mailin 0 #16 September 22, 2003 Did I mention you rock?? Thanks a billion Bill - really, I mean it. JenniferArianna Frances Quote Share this post Link to post Share on other sites
mailin 0 #17 September 22, 2003 You wouldn't happen to have Jim Crouch's extension would you? no big deal, I can call tomorrow too. Thanks again! JenniferArianna Frances Quote Share this post Link to post Share on other sites
quade 4 #18 September 22, 2003 G-force resources http://www.themeparkinsider.com/news/response.cfm?ID=373 http://www.hse.gov.uk/research/hsl_pdf/2002/hsl02-07.pdf http://www.rdrop.com/users/hoofj/glimits.htm http://www.casa.gov.au/avreg/newrules/download/CASRdocs/091/nprm0101c75.pdf http://www1.faa.gov/avr/afs/ac91-61.txtquade - The World's Most Boring Skydiver Quote Share this post Link to post Share on other sites
mailin 0 #19 September 22, 2003 You guys are so great!!Really, I was ready to cry before I started this post - and you guys respond with all this great information! I'm so glad I found you all!! JenniferArianna Frances Quote Share this post Link to post Share on other sites
kallend 1,890 #20 September 22, 2003 Gary Peek has a lot if information on canopy opening forces and G loadings at: www.pcprg.com/pcraps.htm... The only sure way to survive a canopy collision is not to have one. Quote Share this post Link to post Share on other sites
DeNReN 0 #21 September 22, 2003 Cool site....I wonder what kind of G's are pulled in a good sprial( the kind where every 360 has your legs begging you to stop it...because the leg straps are becoming part of you)? With a concern about how your pacemaker will handle G forces....you prob wont be doing them mailin...but now I'm curious Quote Share this post Link to post Share on other sites
mjosparky 4 #22 September 23, 2003 QuoteHumans start blacking out anywhere over 4 Gs(that number gets higher for different people, fighter pilots for example, have a higher tolerance)rollercoasters probably hang around the 4 G or less, maybe occasionaly poking up to 5 or so for a second. Sustained 4-5Gs will black you out pretty quick, but roller coasters don't sustain them. If you have a hard opening, you'll only be feeling those Gs for an INSTANT, but think about it. 120-15 in under a second. Yowch The amount of G's a human can take depends on the person and time. Loads up to 18 G's can be taken if the duration is short, or as little as 4 G's will put you out if the duration is several sec. I have taken 14/15 on several occasions and only grayed out once.My idea of a fair fight is clubbing baby seals Quote Share this post Link to post Share on other sites
darkwing 4 #23 September 23, 2003 Tolerance to G-forces is a highly posture-dependent issue. Being in a harness is very much on the "not good" side of optimal postures. I bet that a 20 g opening would kill a significant fraction of jumpers experiencing them. -- Jeff My Skydiving History Quote Share this post Link to post Share on other sites
schattenjaeger 0 #24 September 23, 2003 Yah, but isn't 20Gs not much better than hitting the ground anyways? Quote Share this post Link to post Share on other sites
Kramer 0 #25 September 23, 2003 I've never had a really hard opening before, so I have no idea how to fathom this. Anyone who has had a 10G opening, describe the what/where/why/how's of it, because my wildest imagination can't come up with something that would make an opening pull 10Gs. Thanks -Kramer The FAKE KRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMER!!!!!!!!! Quote Share this post Link to post Share on other sites
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