Forums: Skydiving: Gear and Rigging:
CYPRES cutters seen in action

 


Abedy  (D 10153)

Nov 13, 2011, 4:13 AM
Post #1 of 12 (1292 views)
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CYPRES cutters seen in action Can't Post

Just impressions I wanted to share, don't intend to start a "My AAD ate yours" discussion, so Nelyubin please just read. Tongue

I attended the annual DFV (German Parachute Association) information and safety meeting yesterday. Airtec were there too and we could see cutters "in action". First, a steel cable was cut (about 4 or 5 millimetres thick). I saw pics before but watching it happen right before your eyes is much more impressing. They the showed us a CYPRES loop and only slid it through the opening of the cutter without the loop being pulled tight. It hang loose, so to say. Everybody could have a look and touch it. The 3-2-1 and it was cut cleanly. Hehe.
If you want to read more or watch a video with a loop and a steel ripcord being cut click here. (Last 10s of the vid are hilarious!) But again, watching it in "real life" is even more impressing Cool

After that I happened to meet Helmut Cloth (pronounced kloat Cool) and he didn't feel "too superior" to talk to a me. Really nice man.

Ah, and well... got me two of their free pull-ups, really good one (see here)


dpreguy  (D 835)

Nov 13, 2011, 8:24 AM
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Re: [Abedy] CYPRES cutters seen in action [In reply to] Can't Post

Got a video of this cutting demonstration?


Abedy  (D 10153)

Nov 13, 2011, 8:26 AM
Post #3 of 12 (1210 views)
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Re: [dpreguy] CYPRES cutters seen in action [In reply to] Can't Post

Not of the one at the meeting but the video in my 1st article shows two cutting demonstrations very much the same as I saw there.


Rover  (D 241)

Nov 13, 2011, 10:34 AM
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Re: [Abedy] CYPRES cutters seen in action [In reply to] Can't Post

http://www.facebook.com/....php?v=2149622504635


Crohnie  (B 36319)

Nov 13, 2011, 11:34 AM
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Re: [Rover] CYPRES cutters seen in action [In reply to] Can't Post

I've seen that video before (the fb one right above me, I beleive also the same one in the op) and the montage of reserve deployments confuses me--obviously most of them are activated by the cypress (you see someone holding the control unit/some other electronic gizmo) but then some of them look to be just someone pulling silver. Why include those in the video? They don't show anything.


riggerrob  (D 14840)

Nov 13, 2011, 11:50 AM
Post #6 of 12 (1078 views)
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Re: [Crohnie] CYPRES cutters seen in action [In reply to] Can't Post

"
In reply to:
... the montage of reserve deployments confuses me--obviously most of them are activated by the cypress (you see someone holding the control unit/some other electronic gizmo) but then some of them look to be just someone pulling silver. Why include those in the video? They don't show anything.
"

........................................................................

To demonstrate that you get a similar pilot-chute launch with both Cypres and ripcord.


Crohnie  (B 36319)

Nov 13, 2011, 3:52 PM
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Re: [riggerrob] CYPRES cutters seen in action [In reply to] Can't Post

I stand corrected. Thanks


RiggerLee

Nov 13, 2011, 4:03 PM
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Re: [riggerrob] CYPRES cutters seen in action [In reply to] Can't Post

 
I'm not a big cypres fan so don't take this as ignorant blind addolation. I've told this story before but I'll repeat it here as it's an example of compleatly independent "testing" program of cypres cutters.

The recovery systems we built for Mustang used a cypres cutter to activate it. Every time I talk to them it seams like they're doing still more testing. Over the years they must have fired hundreds if not a thousand of them by now. It's cutting a loop under high tension just like a reserve with no flaps in the way. To the best of my knowlage none have ever failed. I seem to recall that there antena cost something like $20,000. Frankly if they were haveing failures I think I would have heard about it.

Other then cypres them selves I'm not sure any one has done a thousand test fires of cypres cutters. Even buying them cheap that would be a tall order for a gear manufatorer. And buy the way a lot of those were bought up off of 12 year old cypreses. They had a bounty out on those things. So a good percentage of them were the oldest crap out there and they still fired flawlessly.

Story out of the way I have some questions about the video. Ever seen a cut loop where the strands don't match up? Like it wasn't cut cleanly across and some of the strands on each side are longer clearly from the other side of the cut? How do you recencile this with the video? Is the kenetic energy just heating it till it melts the rest of the way at that point? Because it does not always seem to cut cleanly under tension. Did you see them do the same thing with any other lines, kevlar, HMA, Vectran with a higher melting point? The cable doesn't count. That's about the easiest thing in the world to cut. And yes I am interested for a reason. The stuff I'm working on for armmadillo may have temp issues. Right now we're looking at the M2 cutter that does seem to cut every thing cleanly but we're still trying to get some more out of europe. And no I haven't called them to ask directly.

Lee Hardesty



EDIT: Lee, I removed the reference you made to German's in the last sentence of your post. Entirely uncalled for and will not be tolerated. Please re-read the forum rules and avoid making similar comments in this and other threads.


(This post was edited by LouDiamond on Nov 14, 2011, 3:13 PM)








Abedy  (D 10153)

Nov 15, 2011, 11:13 AM
Post #12 of 12 (576 views)
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Re: [RiggerLee] CYPRES cutters seen in action [In reply to] Can't Post

Just a short re-reply:
I just can mention that Helmut told us that they quite early when testing got to know that some riggers used "adventurous" material for reserve loops like parts of tension lines etc - which got hard, rough etc and thus could get stuck. To deal with the problem they developed the CYPRES loop along with the accompanying CYPRES disc (the "smiley disc".) They decided to give it away for free and keep on doing so and AFAIK they have handed out 3 million loops so far. For free.
Just mention this as this was the work-around to make sure CYPRES can do what it was primarily invented/thought for: Cutting a reserve loop without any problems.

I know CYPRES cutters have been used in other fields, even in space, but I think dealing with the material issues for OTHER purposes can't really be handed down to Airtec Cool Just my 2 Eurocents



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