Groundbound 0 #1 March 20, 2005 I have been unable to find a description with pictures of an AAD or Cypres.. what is the propulsive force that activates it after it senses the excess speed and minimum altitude? Reminder the [N] means Noob question as discussed elsewhere A search of these terms turns up thousands of responses so it seemed easier to ask here. Quote Share this post Link to post Share on other sites
justinb138 0 #2 March 20, 2005 QuoteI have been unable to find a description with pictures of an AAD or Cypres.. what is the propulsive force that activates it after it senses the excess speed and minimum altitude? Reminder the [N] means Noob question as discussed elsewhere A search of these terms turns up thousands of responses so it seemed easier to ask here. IIRC, there is a video of one being used to cut 3mm steel cable on www.skydivingmovies.com. Should give you a good idea of what it looks like, and you can also check out the manufacturers website for more information. Hope that helps a little bit. Quote Share this post Link to post Share on other sites
Hooknswoop 19 #3 March 20, 2005 Think of it as a blank .22 round with a sharp wedge shaped bullet that fires electrically across the hole where the closing loop passes through. Derek Quote Share this post Link to post Share on other sites
diablopilot 2 #4 March 20, 2005 QuoteReminder the [N] means Noob question as discussed elsewhere I LOVE it.---------------------------------------------- You're not as good as you think you are. Seriously. Quote Share this post Link to post Share on other sites
councilman24 36 #5 March 21, 2005 Also know that ALL gasses from the "explosion" are contained in the cutter. It is still pressurized after firing for weeks. So, the "firing" does not damage the container, freebag or reserve. The airtec web site has a diagram. Too lazy to look up link.I'm old for my age. Terry Urban D-8631 FAA DPRE Quote Share this post Link to post Share on other sites
Groundbound 0 #6 March 21, 2005 Is this about right? The sensor (senses about 8 things) decides the jumper needs a reserve canopy out. An electrical impulse results in a blank shell discharging a 'blade' against a cable. This cable had been preventing the reserve from deploying, therefore it now exits the container. Thanks for the continued PMs on all my questions, too. It's fun to learn. I especially like to learn as much as possible before I 'jump' into something! Quote Share this post Link to post Share on other sites
bodypilot1 0 #7 March 21, 2005 QuoteThis cable had been preventing the reserve from deploying, therefore it now exits the container. NO NO NO! It cuts the Cypres closing loop that runs through the cutter! Honestly Dude, your best bet is to go speak with a RIGGER at your local DZ and stop relying on the internet for this information. Keepin' it safe! Edwww.WestCoastWingsuits.com www.PrecisionSkydiving.com Quote Share this post Link to post Share on other sites
billvon 2,450 #8 March 21, 2005 >The sensor (senses about 8 things . . .) Not 8 things. There is only one important sensor in a cypres, a barometric pressure sensor. A microcontroller reads it and decides when to fire. >An electrical impulse results in a blank shell discharging a 'blade' against a cable. Not really. It's a closing loop of flexible material that is cut. The closing loop holds the reserve closed. Once cut, the reserve begins a normal deployment driven (usually) by the pilot chute spring. Quote Share this post Link to post Share on other sites
Groundbound 0 #9 March 21, 2005 Quote>The sensor (senses about 8 things . . .) Not 8 things. There is only one important sensor in a cypres, a barometric pressure sensor. A microcontroller reads it and decides when to fire. >An electrical impulse results in a blank shell discharging a 'blade' against a cable. Not really. It's a closing loop of flexible material that is cut. The closing loop holds the reserve closed. Once cut, the reserve begins a normal deployment driven (usually) by the pilot chute spring. Sorry. But check out the link below - it says "Cypres constantly checks 7 criteria....." Huh! Some kind person has been feeding me tech info behind the scenes. I havent read it all yet but there is a pic here of a 3/32" braided steel cable that the cypres cut. Maybe it was just a strength demonstration, Ill check it out in detail. http://www.cypres.cc/Downloads/6_7_1_information_material/CYPRES_presentation_folder_r5_engl.pdf However, http://www.makeithappen.com/spsj/cypresloop.htm says its polyurethane cord. Thanks Quote Share this post Link to post Share on other sites
pilotdave 0 #10 March 21, 2005 I don't know what the 7 criteria are, but I'd have to guess they're all either derived from barametric pressure or self diagnostics. It only measures pressure. Altitude, fallrate, etc, are computed by the unit. And yeah, they just cut the steel cable to demonstrate the strength of the cutter. Edit: it probably measures internal temperature too. Dave Quote Share this post Link to post Share on other sites
billvon 2,450 #11 March 21, 2005 >Sorry. But check out the link below - it says "Cypres constantly checks 7 > criteria....." It checks several criteria, but only reads from one sensor. >I havent read it all yet but there is a pic here of a 3/32" braided steel cable that the cypres cut. It is indeed cool that a cypres can cut a steel cable, but that's not how they are used in rigs. They cut the closing loop, a cord made of a synthetic material that holds the reserve closed. Quote Share this post Link to post Share on other sites
dorbie 0 #12 March 21, 2005 QuoteQuote>The sensor (senses about 8 things . . .) Not 8 things. There is only one important sensor in a cypres, a barometric pressure sensor. A microcontroller reads it and decides when to fire. >An electrical impulse results in a blank shell discharging a 'blade' against a cable. Not really. It's a closing loop of flexible material that is cut. The closing loop holds the reserve closed. Once cut, the reserve begins a normal deployment driven (usually) by the pilot chute spring. Sorry. But check out the link below - it says "Cypres constantly checks 7 criteria....." Huh! Some kind person has been feeding me tech info behind the scenes. I havent read it all yet but there is a pic here of a 3/32" braided steel cable that the cypres cut. Maybe it was just a strength demonstration, Ill check it out in detail. http://www.cypres.cc/Downloads/6_7_1_information_material/CYPRES_presentation_folder_r5_engl.pdf However, http://www.makeithappen.com/spsj/cypresloop.htm says its polyurethane cord. Thanks Define criteria... I assume something like elapsed time, pressure, derivative of pressure, analysis of variations in derivative of pressure, guestimate of sit vs belly based on the above and fall rate & altitude derived from all of the above. All driven by two things, one internally generated; time and pressure. It's a strength demo. Do you know how a closing loop and pin work? If you know this then you'd understand perfectly when it's stated that the reserve closing loop passes through a hole that is aligned with the cypress cutter. The reserve opens in one of two ways, either the pin gets pulled to start the deployment sequence or the cypress cutting charge fires and propells the cutter through the closing loop to sever it, starting deployment even though the pin is still in place. You should go on a first jump course and JUMP. Many of your questions would be answered. Quote Share this post Link to post Share on other sites
Orange1 0 #13 March 22, 2005 QuoteHonestly Dude, your best bet is to go speak with a RIGGER at your local DZ and stop relying on the internet for this information. or even just a normal instructor Skydiving: wasting fossil fuels just for fun. Quote Share this post Link to post Share on other sites
