Forums: Skydiving: Safety and Training:
Short of Breath

 


shibu  (C 42074)

Aug 7, 2012, 7:45 AM
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Short of Breath Can't Post

Last year my home DZ had a boogie with a Caribou rear exit plane (like this one: http://www.youtube.com/watch?v=pgvDEdaqq08 ).

I had always wanted to jump out of a rear exit so I did ~4 times. Everything went fine but on the climb up I felt a little short of breath. Not enough to make me feel tired or like it was unsafe for me to jump but still short of breath.

Between those Caribou jumps, I also jumped from a Caravan (which I am used to jumping from) & I felt fine.

Was I nervous? I've never been short of breath when I was nervous before.
Is this common on larger planes with rear exits?


Hermes70

Aug 7, 2012, 8:09 AM
Post #2 of 22 (2321 views)
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Re: [shibu] Short of Breath [In reply to] Can't Post

Yes. Because of the tailgate opening, the air in the cabin is sucked out the back end, creating a low-pressure area in the cabin. So it's the equivalent of being at a high altitude where there's less oxygen. And that leads some people to feel short of breath and to pant like a dog. Most people compensate by absorbing oxygen through their skin, like fish with gills. You might be one of the people who didn't inherit the fish gene, and so you feel it worst than most.


airtwardo  (D License)

Aug 7, 2012, 8:20 AM
Post #3 of 22 (2309 views)
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Re: [Hermes70] Short of Breath [In reply to] Can't Post

In reply to:
Yes. Because of the tailgate opening, the air in the cabin is sucked out the back end, creating a low-pressure area in the cabin. So it's the equivalent of being at a high altitude where there's less oxygen. And that leads some people to feel short of breath and to pant like a dog. Most people compensate by absorbing oxygen through their skin, like fish with gills. You might be one of the people who didn't inherit the fish gene, and so you feel it worst than most.

Very few people don't carry the gill gene, natural selection weeded out the mouth breathers long ago.

Might be too much Spandex in the jumpsuit...Laboratory tests show the oxygen doesn't get absorbed through the skin as efficiently when wearing Spandex.

Jumping rear exit aircraft requires cotton fabric jumpsuits or better yet totally naked for those not use to doing it.


theplummeter  (C License)

Aug 7, 2012, 8:40 AM
Post #4 of 22 (2289 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

There's a lot of science happening here today.


Premier Remster  (C License)

Aug 7, 2012, 8:46 AM
Post #5 of 22 (2285 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

Quote:
Jumping rear exit aircraft requires cotton fabric jumpsuits

I went with a poly-cotton blend. The synthetic fibers don't absorb water as much as cotton, making it possible to skin-breathe even if you inadvertently bust a cloud. Safety 1st. Cloud induced hypoxia has claimed too many lives already.


airtwardo  (D License)

Aug 7, 2012, 9:03 AM
Post #6 of 22 (2273 views)
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Re: [Remster] Short of Breath [In reply to] Can't Post

In reply to:
Quote:
Jumping rear exit aircraft requires cotton fabric jumpsuits

I went with a poly-cotton blend. The synthetic fibers don't absorb water as much as cotton, making it possible to skin-breathe even if you inadvertently bust a cloud. Safety 1st. Cloud induced hypoxia has claimed too many lives already.

As you well know that's the exact reason you are NOT supposed to be jumping through clouds anyway.

That restriction was put in place long ago when the jumpsuits were much heavier material and ground sweat wouldn't evaporate much at the lower free-fall speeds...busting a cloud totally blocked off all oxy-skin ability to breath.

It has been held over because of the old guys still jumping that gear, which never wears out...AND because of the OSHA test with Spandex.


Premier Remster  (C License)

Aug 7, 2012, 9:05 AM
Post #7 of 22 (2268 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

You dino's are just trying to keep us down. Cloud busting is perfectly safe at the faster freefall speed we now do, and with proper gear.


airtwardo  (D License)

Aug 7, 2012, 9:13 AM
Post #8 of 22 (2263 views)
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Re: [Remster] Short of Breath [In reply to] Can't Post

In reply to:
You dino's are just trying to keep us down. Cloud busting is perfectly safe at the faster freefall speed we now do, and with proper gear.

Yeah right n00b...I'm NOT getting into the whole Boots vs. Tevas - gloves/no gloves debate with you AGAIN! Crazy

Perfectly safe to wear a Pioneer double zipper 100% heavy cotton jumpsuit as long as your goggles are properly vented...at ANY freefall speed!


dthames  (B 37674)

Aug 7, 2012, 10:25 AM
Post #9 of 22 (2226 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

That is all rather surprising to me (the skin stuff). I spend a lot of time while I was growing up, practicing holding my breath. Maybe it was also part genetic but I got to where I could hold my breath much longer than the average person. Mostly by practice. The ambient temperature, persons excitement level, and activity level all contribute to how much oxygen is used by the body. I dont think the skin absorption is as much of a factor as some think it is. Wink

To blow gently while exhaling will cause an increase in the oxygen you absorb out of the air. That might help.


airtwardo  (D License)

Aug 7, 2012, 10:48 AM
Post #10 of 22 (2211 views)
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Re: [dthames] Short of Breath [In reply to] Can't Post

To blow gently while exhaling will cause an increase in the oxygen you absorb out of the air.

In reply to:

With enough practice one CAN learn to breathe through their ears...at least that what my wife keeps tellin' me. Blush


Premier Remster  (C License)

Aug 7, 2012, 10:55 AM
Post #11 of 22 (2208 views)
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Re: [dthames] Short of Breath [In reply to] Can't Post

Quote:
That is all rather surprising to me (the skin stuff)

You're not the 1st one to be taken aback by it.


Divalent  (C 40494)

Aug 7, 2012, 11:14 AM
Post #12 of 22 (2198 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

In reply to:
... Might be too much Spandex in the jumpsuit...Laboratory tests show the oxygen doesn't get absorbed through the skin as efficiently when wearing Spandex. ...

Maybe true for the first versions in the pre-Goldfinger era, but modern Spandex jumpsuits have that small rectangular opening right about in the small of your back that allows you to breath; just a little bit is all you need. (Just don't make the fatal mistake of wearing a Spandex undergarmet that covers this area; remember that chick?)


shibu  (C 42074)

Aug 7, 2012, 11:51 AM
Post #13 of 22 (2180 views)
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Re: [Hermes70] Short of Breath [In reply to] Can't Post

In reply to:
Yes. Because of the tailgate opening, the air in the cabin is sucked out the back end, creating a low-pressure area in the cabin. So it's the equivalent of being at a high altitude where there's less oxygen. And that leads some people to feel short of breath and to pant like a dog. Most people compensate by absorbing oxygen through their skin, like fish with gills. You might be one of the people who didn't inherit the fish gene, and so you feel it worst than most.

Thanks. I've been wondering about this for a while.


shibu  (C 42074)

Aug 7, 2012, 11:54 AM
Post #14 of 22 (2177 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

In reply to:
In reply to:
Yes. Because of the tailgate opening, the air in the cabin is sucked out the back end, creating a low-pressure area in the cabin. So it's the equivalent of being at a high altitude where there's less oxygen. And that leads some people to feel short of breath and to pant like a dog. Most people compensate by absorbing oxygen through their skin, like fish with gills. You might be one of the people who didn't inherit the fish gene, and so you feel it worst than most.

Very few people don't carry the gill gene, natural selection weeded out the mouth breathers long ago.

Might be too much Spandex in the jumpsuit...Laboratory tests show the oxygen doesn't get absorbed through the skin as efficiently when wearing Spandex.

Jumping rear exit aircraft requires cotton fabric jumpsuits or better yet totally naked for those not use to doing it.

I'll keep the spandex thing in mind but I was wearing a student jumpsuit at the time. Maybe I'll jump without a suit if it bother me again this year... if we are lucky enough to get another rear exit plane.


(This post was edited by shibu on Aug 7, 2012, 11:55 AM)


airtwardo  (D License)

Aug 7, 2012, 12:10 PM
Post #15 of 22 (2161 views)
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Re: [shibu] Short of Breath [In reply to] Can't Post

In reply to:
In reply to:
In reply to:
Yes. Because of the tailgate opening, the air in the cabin is sucked out the back end, creating a low-pressure area in the cabin. So it's the equivalent of being at a high altitude where there's less oxygen. And that leads some people to feel short of breath and to pant like a dog. Most people compensate by absorbing oxygen through their skin, like fish with gills. You might be one of the people who didn't inherit the fish gene, and so you feel it worst than most.

Very few people don't carry the gill gene, natural selection weeded out the mouth breathers long ago.

Might be too much Spandex in the jumpsuit...Laboratory tests show the oxygen doesn't get absorbed through the skin as efficiently when wearing Spandex.

Jumping rear exit aircraft requires cotton fabric jumpsuits or better yet totally naked for those not use to doing it.

I'll keep the spandex thing in mind but I was wearing a student jumpsuit at the time. Maybe I'll jump without a suit if it bother me again this year... if we are lucky enough to get another rear exit plane.


If you soak a student jumpsuit in a bucket of pure prop wash and hang it out to dry on some flight line with suitable weights attached to the extremities, it will stretch the fabric making it more porous and usable for the rear entry & exit application.


theonlyski  (D License)

Aug 7, 2012, 3:08 PM
Post #16 of 22 (2093 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

In reply to:
If you soak a student jumpsuit in a bucket of pure prop wash and hang it out to dry on some flight line with suitable weights attached to the extremities, it will stretch the fabric making it more porous and usable for the rear entry & exit application.

I don't know why you guys are giving him such a hard time.


OP: Just ask the pilot for the oxygen line that every skyvan has installed. They generally don't pass it out unless you ask.


Premier Remster  (C License)

Aug 7, 2012, 3:16 PM
Post #17 of 22 (2081 views)
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Re: [theonlyski] Short of Breath [In reply to] Can't Post

In reply to:
In reply to:
If you soak a student jumpsuit in a bucket of pure prop wash and hang it out to dry on some flight line with suitable weights attached to the extremities, it will stretch the fabric making it more porous and usable for the rear entry & exit application.

I don't know why you guys are giving him such a hard time.


OP: Just ask the pilot for the oxygen line that every skyvan has installed. They generally don't pass it out unless you ask.

For fuck's sake! It was a Caribou. They don't have an O2 line. You have to ask manifest for the bag of oxygen before getting in the plane if you want some.

That's what's wrong with DZ.com... Bunch of 500 jump know it all skygods.


airtwardo  (D License)

Aug 7, 2012, 3:17 PM
Post #18 of 22 (2081 views)
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Re: [theonlyski] Short of Breath [In reply to] Can't Post

In reply to:
In reply to:
If you soak a student jumpsuit in a bucket of pure prop wash and hang it out to dry on some flight line with suitable weights attached to the extremities, it will stretch the fabric making it more porous and usable for the rear entry & exit application.

I don't know why you guys are giving him such a hard time.


OP: Just ask the pilot for the oxygen line that every skyvan has installed. They generally don't pass it out unless you ask.



It was a Caribou not a Skyvan...Doubtful an 02 line would stretch from one aircraft to the other without the in-flight docking apparatus hooked up, and that not only screws up the rate of climb but reverses the jump-run direction.

Hardly worth the trouble if it's just a jumpsuit malfunction. Like I've always said, if they used buttons instead of zippers this would never BE an issue.


dthames  (B 37674)

Aug 7, 2012, 3:31 PM
Post #19 of 22 (2065 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

I don't think I could make it to the weekend without DZ.com. What a pool of.........talent!


PiLFy  (A License)

Aug 7, 2012, 3:58 PM
Post #20 of 22 (2052 views)
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Re: [airtwardo] Short of Breath [In reply to] Can't Post

Damnit, Jim. Come on, man?! You know better than this. A little subtlety goes a long way. Had you not been so obvious in screwing w/him. We could've drawn him in & kept it going for a while. Now, it's just gonna make it that much harder to draw him in next time Crazy...


shibu  (C 42074)

Aug 7, 2012, 4:19 PM
Post #21 of 22 (2040 views)
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Re: [theonlyski] Short of Breath [In reply to] Can't Post

In reply to:
In reply to:
If you soak a student jumpsuit in a bucket of pure prop wash and hang it out to dry on some flight line with suitable weights attached to the extremities, it will stretch the fabric making it more porous and usable for the rear entry & exit application.

I don't know why you guys are giving him such a hard time.


OP: Just ask the pilot for the oxygen line that every skyvan has installed. They generally don't pass it out unless you ask.

Thanks. I appreciate it.


Nutz  (D License)

Aug 8, 2012, 3:33 AM
Post #22 of 22 (1925 views)
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Re: [Remster] Short of Breath [In reply to] Can't Post

By the way, its safety 3rd. Wink



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