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The Z-hills Double Fatal Speculation Thread

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Same time longer distance/altitude due to speed.



Thanks John, that confirms what I was trying to point out in one of these threads where I listed distance covered at various freefall speeds.

Via PM ~ I got some comments 'correcting' my assertion...it's seems there are those who believe that double the freefall speed = 1/2 the opening distance.

"...the parachute opens faster because you're going faster" is somewhat flawed logic regarding this type of scenario- IMO.










~ If you choke a Smurf, what color does it turn? ~

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You know, some things do happen faster,but the overall result is more distance due to more speed.
I find that to deploy a canopy in 300 feet at terminal you had better be able to do it in 200 feet at cutaway speeds. Apply that to what we are seeing. [:/]

John



Understood.

I get the feeling some believe it's a more exact science in regard to the 'twice the speed = 1/2 the time & distance' that just isn't something to bet your life on.










~ If you choke a Smurf, what color does it turn? ~

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You know, some things do happen faster,but the overall result is more distance due to more speed.
I find that to deploy a canopy in 300 feet at terminal you had better be able to do it in 200 feet at cutaway speeds. Apply that to what we are seeing. [:/]

John



Not directed at you Twardo just a question.... I have read a lot of why "SOS set ups are bad". I just wonder if what I hae heard holds any water. Unless you are doing CRW, or possibly camera.... why not an SOS. I know some are going to slam this but I know many very experienced skydivers that believe it is the only way to go. After all.... if you are jumping a skyhook or an rsl aren;t you really just trying to replicate what an SOS accomplishes except in a more complicated manner? I would love to hear some thoughts on this... perhaps it should go in to gear and rigging.....

Rob

Understood.

I get the feeling some believe it's a more exact science in regard to the 'twice the speed = 1/2 the time & distance' that just isn't something to bet your life on.

Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
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>why not an SOS.

There are definitely pros and cons. The one negative that bothers me is that riser twist that traps the cutaway cables, or causes even a hard pull, means you can't open your reserve without using a backup means (i.e. pulling directly on the RSL shackle or something.) However that's a very unusual problem, especially with hard riser channels.

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>why not an SOS.

There are definitely pros and cons. The one negative that bothers me is that riser twist that traps the cutaway cables, or causes even a hard pull, means you can't open your reserve without using a backup means (i.e. pulling directly on the RSL shackle or something.) However that's a very unusual problem, especially with hard riser channels.



That is what I was going to ask... with hard riser channels do you think that is still possible? That would take a lot of force but in our sport a lot of force does happen.
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
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That is what I was going to ask... with hard riser channels do you think that is still possible? That would take a lot of force but in our sport a lot of force does happen.



Yes, that is still possible. But much more likely and prevalent from poorly maintained cutaway cables and systems over-all, actually. Not just specifically pertaining to hard-housings preventing cable-pinch from linetwists, which is here - what you are referring to. I've unfortunately seen many more hard (cutaway) pulls, occur caused by something as simple as dirty, poorly maintained cables and systems actually. - Regardless of which system they happen to be.
coitus non circum - Moab Stone

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The one negative that bothers me is that riser twist that traps the cutaway cables, or causes even a hard pull,



This is a fallacy: Twisted risers don’t trap the cables in the cloth riser channels if the yellow cable is properly lubricated or if you have a red cable. Hard housing don’t help.

Proof: In a suspended harness lubricate your yellow cable and route it as normal but by pass the riser locking loops. Use a temporary cable for the riser loops. Load the harness with an extra person hanging on each side (3 bloke test) and twist it upto the 3 rings. Have the person in the harness pull the release cable. Now pull each of the individual riser cables and compare the difference. You may repeat the test with hard housings but you will not need to.

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The one negative that bothers me is that riser twist that traps the cutaway cables, or causes even a hard pull,



This is a fallacy: Twisted risers don’t trap the cables in the cloth riser channels if the yellow cable is properly lubricated or if you have a red cable. Hard housing don’t help.

Proof: In a suspended harness lubricate your yellow cable and route it as normal but by pass the riser locking loops. Use a temporary cable for the riser loops. Load the harness with an extra person hanging on each side (3 bloke test) and twist it upto the 3 rings. Have the person in the harness pull the release cable. Now pull each of the individual riser cables and compare the difference. You may repeat the test with hard housings but you will not need to.



Okay.... with all of that said.... why not an SOS system?
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
Muff Brother #4382 Dudeist Skydiver #000
www.fundraiseadventure.com

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>That is what I was going to ask... with hard riser channels do you think that is still possible?

Sure; you can get a kink in the cable (i.e. "cable suck") or a pebble in the harness housing. Odds of them are low which is why I don't think it's a big deal.

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The one negative that bothers me is that riser twist that traps the cutaway cables, or causes even a hard pull,



This is a fallacy: Twisted risers don’t trap the cables in the cloth riser channels if the yellow cable is properly lubricated or if you have a red cable. Hard housing don’t help.

Proof: In a suspended harness lubricate your yellow cable and route it as normal but by pass the riser locking loops. Use a temporary cable for the riser loops. Load the harness with an extra person hanging on each side (3 bloke test) and twist it upto the 3 rings. Have the person in the harness pull the release cable. Now pull each of the individual riser cables and compare the difference. You may repeat the test with hard housings but you will not need to.



Okay.... with all of that said.... why not an SOS system?



Does suck to have an SOS in winds. Can't chop the canopy if you are getting drug around the landing area....

It has its merits, but it just seems safer to be able to activate the reserve independently.

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Okay.... with all of that said.... why not an SOS system?

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One example- in the popular video going around in which a jumpers cutaway pud is inadvertently pulled on exit and handed back to him...

'what if' that happened during a squirrely exit and the reserve somehow horseshoed or otherwise malfunctioned? Like a late diver going through the unexpected reserve and shredding it...

You would have a packed up main that is of absolutely no good to you.











~ If you choke a Smurf, what color does it turn? ~

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Okay.... with all of that said.... why not an SOS system?

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One example- in the popular video going around in which a jumpers cutaway pud is inadvertently pulled on exit and handed back to him...

'what if' that happened during a squirrely exit and the reserve somehow horseshoed or otherwise malfunctioned? Like a late diver going through the unexpected reserve and shredding it...

You would have a packed up main that is of absolutely no good to you.



That is a valid point but there is a very small chance of that happening. I do see your point though.
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
Muff Brother #4382 Dudeist Skydiver #000
www.fundraiseadventure.com

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The one negative that bothers me is that riser twist that traps the cutaway cables, or causes even a hard pull,



This is a fallacy: Twisted risers don’t trap the cables in the cloth riser channels if the yellow cable is properly lubricated or if you have a red cable. Hard housing don’t help.

Proof: In a suspended harness lubricate your yellow cable and route it as normal but by pass the riser locking loops. Use a temporary cable for the riser loops. Load the harness with an extra person hanging on each side (3 bloke test) and twist it upto the 3 rings. Have the person in the harness pull the release cable. Now pull each of the individual riser cables and compare the difference. You may repeat the test with hard housings but you will not need to.



Okay.... with all of that said.... why not an SOS system?



Does suck to have an SOS in winds. Can't chop the canopy if you are getting drug around the landing area....

It has its merits, but it just seems safer to be able to activate the reserve independently.

top



I am not sure if it does seem safer. Easy fix to your situation.... do not jump in those high of winds. I personally do not right now even with my two handle system.
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
Muff Brother #4382 Dudeist Skydiver #000
www.fundraiseadventure.com

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Okay.... with all of that said.... why not an SOS system?

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One example- in the popular video going around in which a jumpers cutaway pud is inadvertently pulled on exit and handed back to him...

'what if' that happened during a squirrely exit and the reserve somehow horseshoed or otherwise malfunctioned? Like a late diver going through the unexpected reserve and shredding it...

You would have a packed up main that is of absolutely no good to you.



That is a valid point but there is a very small chance of that happening. I do see your point though.



Small chance maybe...IF it did though, there would be zero chance of it ever happening to ya AGAIN!










~ If you choke a Smurf, what color does it turn? ~

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Easy fix to your situation.... do not jump in those high of winds. I personally do not right now even with my two handle system.



Never had wind speed or direction or both change on ya', eh? Hang in there...it'll happen.
My reality and yours are quite different.
I think we're all Bozos on this bus.
Falcon5232, SCS8170, SCSA353, POPS9398, DS239

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>Can't chop the canopy if you are getting drug around the landing area....

Sure you can; the reserve will then open and you'll need a repack, but you won't get dragged. (Same problem with an RSL.)




Sorry, no... not the same problem.

You can disconnect an RSL when you see that the winds might require a cutaway when you land, but unless they've changed the design since I last saw one, you can't disconnect the cutaway and reserve pull functions on an SOS.

B|
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SCR-6933 / SCS-3463 / D-5533 / BASE 44 / CCS-37 / 82d Airborne (Ret.)

"The beginning of wisdom is to first call things by their right names."

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Easy fix to your situation.... do not jump in those high of winds. I personally do not right now even with my two handle system.



Never had wind speed or direction or both change on ya', eh? Hang in there...it'll happen.


Pops... ya I have but not to the speeds that it drags me around. Maybe a little pull but nothing really that bad. I'm sure it will happen eventually. I have really een thinking about this because of some very experienced jumpers that use an SOS system still. Everything that I have ever heard negative about them is either a rare circumstance which lets be honest.... those can occur on any piece of equipment or when it gets down to it... the jumper does not look cool with an SOS :P
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
Muff Brother #4382 Dudeist Skydiver #000
www.fundraiseadventure.com

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Okay.... with all of that said.... why not an SOS system?

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One example- in the popular video going around in which a jumpers cutaway pud is inadvertently pulled on exit and handed back to him...

'what if' that happened during a squirrely exit and the reserve somehow horseshoed or otherwise malfunctioned? Like a late diver going through the unexpected reserve and shredding it...

You would have a packed up main that is of absolutely no good to you.



That is a valid point but there is a very small chance of that happening. I do see your point though.



Small chance maybe...IF it did though, there would be zero chance of it ever happening to ya AGAIN!



Twardo..... once again VERY valid point. Same thing could be said of many pieces of equipment though... right? AAD for insance.... door opens, pressure change, you are by the door.... reserve comes out and you hit the tail. Very rare occurance but it has happened. Very likely if it happened to you it woud never happen again. I am not for or against an SOS I am just thinking through it all and getting opinions. I appreciate yours and everyone else's.
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
Muff Brother #4382 Dudeist Skydiver #000
www.fundraiseadventure.com

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if your on the gound getting dragged you can pull an SOS just a bit for cutaway only with most systems and a couple of practices



I was told the same thing.... you can stage your pull.
Life is all about ass....either you're kicking it, kissing it, working it off, or trying to get a piece of it.
Muff Brother #4382 Dudeist Skydiver #000
www.fundraiseadventure.com

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Okay.... with all of that said.... why not an SOS system?



The only problem, other than those already mentioned, with the SOS (SINGLE Handle Operating System), is that is takes 2 hands to operate it.
One for the initial pull and the other to grab the cable half way from the handle and finish the pull. The stroke is too long for your arm. This is inherrent in the design because of the required cable lengths.
The configuration must allow for the release of the risers before the reserve is released. Some long armed folks can reach, in one stroke, on some rigs, but not all.

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