BMFin 0 #1 July 15, 2002 Is there any Unwanted reserve rides caused by Cypres ? How many ? Someone told me there is only one case : Cypres fired in flare, the reason is not sure.. But I do not quite belive him. There must be more. Quote Share this post Link to post Share on other sites
PhreeZone 20 #2 July 15, 2002 Cypres misfires happen. One happened to someone on these boards at about 8000 feet over Perris last year. Billvon misfired one not long ago at Otay. They happen. They are rare, but with most electronics.... they experience glitches every once and a while. There are aso a few times where a cypres should have fired... and never did. One was attributed to batteries that were too old, and some other things for the rest. A cypres is a tool... its great to use the tool, don't rely on the tool to work properly 100% of the time.Yesterday is history And tomorrow is a mystery Parachutemanuals.com Quote Share this post Link to post Share on other sites
Kirils 1 #3 July 15, 2002 Last year I contacted the manufacturer of both the Cypres and Astra reguarding the incidence of misfire. Records are kept on reported problems, but they do not make the data public. SSK was not at all willing to discuss the frequency of misfires. I became concerned about misfire under canopy (jumping an ultra high performance canopy) and changed the Cypres out for an Astra, where I can turn the thing off under canopy."Slow down! You are too young to be moving that fast!" Old Man Crawfish Quote Share this post Link to post Share on other sites
jbrasher 1 #4 July 16, 2002 It was 4,000' just after break-off Red, White and Blue Skies, John T. Brasher D-5166 Quote Share this post Link to post Share on other sites
Shark 0 #5 July 16, 2002 QuoteIt was 4,000' just after break-off A-Firm. I watched Nick track, then the reserve pc come out. It may have even been a few hundred feet higher since he as inexperienced and wanted some time to track. Shark CCR-2113 CCS- ? Quote Share this post Link to post Share on other sites
PhreeZone 20 #6 July 16, 2002 I completly missed this one... >SSK was not at all willing to discuss the frequency of misfires. I can understand this one, but have you tried to get the figures out of FXC yet on the Astra? I'm thinking there was one 2 weeks ago since one of the jumpers saw a freebag go by him at 11000 feet and the jumper that had to ride the reserve SWORE that it was on and calabrated on the ground. Anything that is subjected to the constantly changing environment of freefall will eventually fail. Even turning a unit off does not mean that it can not go off... the potential of a static build up, hard opening releasing the cutter or other freaky things is so tiny that it never crosses peoples minds, but there is that slight chance that everything can work out to make it fire on accident.Yesterday is history And tomorrow is a mystery Parachutemanuals.com Quote Share this post Link to post Share on other sites
howardwhite 6 #7 July 16, 2002 I heard the other day about a Cypres fire that happened in the Otter *mockup.* The explanation was that radios were in use. Your Cypres should have an RF shield, a plastic condom that goes over the unit you set. It's a pain in the butt because it makes the display harder to read under some circumstances, but make sure it's there.. HW Quote Share this post Link to post Share on other sites
Spy38W 0 #8 July 16, 2002 QuoteYour Cypres should have an RF shield, a plastic condom that goes over the unit you set. It's a pain in the butt because it makes the display harder to read under some circumstances, but make sure it's there.. I was under the impression that all of the Cypres' in use should not need the shield anymore (assuming they have been getting the 4/8 year inspections) because of modifications made to the unit by Airtec.. -- Hook high, flare on time Quote Share this post Link to post Share on other sites
PhreeZone 20 #9 July 16, 2002 Pete... you are correct, If your cypres has been following its maintence schedule like it should have been, the last of the RF shields should have been removed this spring. If you still have the cover on it, that means your cypres either needs to go in for a maintence window that was missed or your rigger left it on as extra protection. Parachutist had an article on this early in the spring as a little page filler blurb.Yesterday is history And tomorrow is a mystery Parachutemanuals.com Quote Share this post Link to post Share on other sites
howardwhite 6 #10 July 16, 2002 Mine still has it and the Cypres is current. Maybe my rigger is being extra cautious. Will check. HW Quote Share this post Link to post Share on other sites
billvon 3,123 #11 July 16, 2002 >Mine still has it and the Cypres is current. Maybe my rigger is being > extra cautious. Will check. We do that too, but we had a misfire 2 weeks ago anyway. Quote Share this post Link to post Share on other sites
howardwhite 6 #12 July 17, 2002 The folks here are right. There's a press release dated Jan. 1 on the Airtec web site which says that the "silver sleeve" is no longer required on Cypres units in current (maintained) service. I'm gonna take mine off. HW Quote Share this post Link to post Share on other sites
AndyMan 7 #13 July 17, 2002 QuoteI'm gonna take mine off Why? It certainly won't hurt... That silver plastic is constantly used in the computer and electronics industry to protect components... it does it's job well. They surely won't solve every misfire, because a misfire isn't necesarily caused by EMF (electro magnetic interference - aka radio waves). Misfires could also even be cause by a programming bug somewhere... The control unit is usually the one sheilded... anybody know how the processing unit is shielded? _Am__ You put the fun in "funnel" - craichead. Quote Share this post Link to post Share on other sites
billvon 3,123 #14 July 17, 2002 >Why? It certainly won't hurt... That silver plastic is constantly used in > the computer and electronics industry to protect components... it > does it's job well. Well, it's job is to protect against ESD (static) damage - it is not designed to protect against EMI. It does provide some attenuation, but not much. >They surely won't solve every misfire, because a misfire isn't > necesarily caused by EMF (electro magnetic interference - aka radio > waves). Misfires could also even be cause by a programming bug > somewhere... It would take a pretty remarkable string of coincidences to have a programming bug occur when a nearby transmitter is keyed a half dozen times in a row. >The control unit is usually the one sheilded... anybody know how the >processing unit is shielded? It's likely that it is not shielded per se. Most of the EMI pickup on a device like a cypres comes from the wires, since they intercept more flux (i.e. make better antennas.) I suspect that the fix was the addition of filtering components on the lines going to the control unit and cutter. If I can ever get my hands on a timed-out cypres I can verify this. Quote Share this post Link to post Share on other sites
