adamUK
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Everything posted by adamUK
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Naked friendly DZ in NC, SC, TN, or GA?
adamUK replied to SansSuit's topic in Events & Places to Jump
Can't you just go out in a thong which then accidentally gets snagged on a hook knife that was inadvertently left out in the jump ship. Sure you might get grounded for the rest of the day but once the DZO's been plied with beer he might soften up. -
Patent for cypress here: http://www.google.com/patents/US5825667 Interestingly as well as an accelerometer the patent also specifies a tilt sensor.
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I'd build a kite first which would allow you to make mistakes without costing you too much canopy material. Once you've got something that looks about right then do the real deal. I don't know you'd be able to jump your canopy without dispensation (and you'd have to use a cutaway rig in any case). But yeah.. gotta admire your aspiration to do this. I am sure you will learn a lot on how they are made, how the deployment sequence works, how they fly and a ton of other stuff in the process even if you don't eventually produce the jumpable product. Good luck
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Yes. That'd be a decision by Vigil. One of the difficulties when designing high integrity safety systems (we work with detectors that conform to IEC 61508 which is a standard for high reliability & integrity systems) is that you have to design for normal operation, abnormal operation and possible fault conditions. Determining each possible scenario and then deciding what the outcome is a lengthy task and in the Vigil's case it has to estimate what's actually happening dependent on only one or 2 inputs. Two scenarios (e.g. a low exit by a jumper vs. a rapid pressure change within the plane) could look very similar purely from a pressure perspective hence why the accelerometer input would be useful. Sorry for the long post. Just couldn't stop typing!
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You can buy accelerometers with freefall detection (like the ones that go into hard drives) and I think this would be a key piece of data when deciding when to fire the AAD.
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The unit could be made to arm at a higher altitude as it'll be collecting data just after take off. A successive approximation algorithm works by improving its result as more data are collected. Early in the jump it's a rougher estimate than later. The algorithms may just need improving on the vigil to cope with unforseen changes in pressure during climb, particularly around activation height since it's unlikely that an exit will be made at below 1500 ft (particularly on the student version). The accelerometer on the cypres will be used to augment the barometer by sensing both freefall and opening. Typically barometers are only accurate to about 1kPa (which is about 280ft change at 1000 ft altitude). I don't know if Cypress use a more sensitive barometer than those readily available commercially. An interesting topic nonetheless.
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From what I read on the paper I found it was dependent on not only force magnitude and duration but also direction and the rate of increase of the force applied. I ended up with painful lower back, substantial bruise on my arm and my chin had also bruised my chest at the manubrium. I was lucky I guess considering some of the postings on here. I discussed the incident with the rigger and it seems that a line dump was the most probable cause of the hard opening and it's something that I'll pay a lot more attention to in future. I'll look up the reference you supplied and thanks for the input.
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Thanks
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Found some interesting information here though it refers to automotive and aeronautical fields primarily: ftp://ftp.rta.nato.int/PubFullText/RTO/EN/RTO-EN-HFM-113/EN-HFM-113-06.pdf P.S. The severely injured data points are from tests using chimp and pigs. So not much different to skydivers then
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Hello all, I had a slammer a few months ago that left me bruised but not busted but it did leave me seeing stars. I also have followed the tandem fatality thread with interest ( http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=4330697;sb=post_latest_reply;so=ASC;forum_view=forum_view_collapsed;;page=unread#unread ) My question is: Does anyone have any data on the loads placed upon the body during opening and for a particularly hard opening what levels would cause serious injury or incapacitation? Has anyone measured these? Many thanks in advance. Adam.
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That'd be great to jump out of with very low forward speed.
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I use these with no problem. They also come with a strap that goes around your head: http://www.screwfix.com/p/bolle-eyewear-yellow-lens-tracker-safety-specs/21579 also available in clear lens http://www.screwfix.com/p/bolle-eyewear-clear-lens-tracker-safety-specs/43500 And save yourself 20 quid!
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Or a rigger, so I have been told.
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Would a skyhook be any better in this situation??
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Any details on the container & reserve? Well done that man. Scary stuff indeed.
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What did your instructors say? They will have seen how you handle your canopy moreso than anyone here. Good luck! It's exciting buying your first rig
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That's where I've been going wrong. I'm ham fisted with big sausage fingers. I swear I can press all 3 buttons at once by accident.
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It's pretty easy really. You press two buttons together 3 times then go to the menu menu then press another few buttons a total of 14 or , er 15 times until the unit flashes green then get the manual out, try to hold it open in one hand whilst simultaneously pushing 4 buttons together then the manual flops shut so you lose your page. Finally you stuff the damn thing it in your kit bag and let it turn itself off.
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I had the stitching on the cutaway hard housing break on both risers after a hard opening which gave me a nice few bruises and i was definitiely seeing stars afterwards. The rigger repaired it and inspected the rest of the container which was okay. 8 y.o rig, 300 jumps on it.
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Same rate of climb as the GA8 airvan.
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Feliz aniversario em Portugues.
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Selamat hari jadi in Malay.
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FIFY
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Sorry. Re-read the list above and realised maybe we're talking a different kind of theatre.
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