one of those moments

simon varley · 25th June 2007, 02:40

I had one of those moments yesterday. You know, the good ones for a change. The sea was flat, the vis was good, and for once, my buoyancy was spot on. The OC guys were somewhere behind me and I was swimming through one of the J-class submarines. I could see all the way through, and the shoals of fish weren't being disturbed so I just lay there and hovered watching the pretty fishes.

Unfortunately the ascent wasn't quite so much fun. Almost as soon as we started to rise up, I had trouble getting a breath. It felt like the loop was empty. I tried harder, and suddenly I got some air, but the WOB had really gone up. All the way up, and through the deco the WOB was really hard. The loop was venting so there was plenty of gas in it. ADV and manual add didn't make any difference, and there was no gurgling sound. O2 control was spot on and I didn't feel out of breath or anything.

When I stripped the unit, it was again breathing okay. The only odd thing I could find was a very small amount of water in the inhale CL. Everything else was bone dry.

I guess I'm thinking a sticky mushroom valve, but it seems odd that it was working fine on the bottom and just played up on the ascent. Don't know what else would suddenly increase the WOB though, so if anyone's got any ideas I'd be very greatful to hear them

regards

Simon

PCDiver · 25th June 2007, 04:08

Perhaps a kinked hose?

simon varley · 25th June 2007, 04:38

Quote: (Originally Posted by PCDiver)

Perhaps a kinked hose?

could be I guess - changing from horizontal in the water, to vertical for the ascent might have just twisted things a bit

ianskip · 25th June 2007, 07:06

I recently had an experience where at the beginning of the dive my breathing felt strange with some added WOB. This unnerved me so I fiddled with hoses and mouthpiece and soon discovered the mouthpiece wasn't fully open. It was a very simple problem to sort but for a short time it was a worry.

Maybe your mouthpiece could have rotated and become partially closed.

Mike · 25th June 2007, 08:15

Another vote for kinked hose - I've experienced it twice on inspos.

Watch the surge on the subs

Who were you diving with? I was intending to get out, but didn't get all the pieces of my breather back together in time.

Mike

silent running · 25th June 2007, 08:27

Quote: (Originally Posted by Mike)

Another vote for kinked hose - I've experienced it twice on inspos.

3rd vote for kinked hose? I've experienced the same thing a few times and it was a kinked hose from the DSV, never from the head to the CLs as those hoses on the Prism are thicker than the DSV hoses. Made me wish that the DSV hoses were more rigid, but then it would be less easy to move my head around...

simon varley · 25th June 2007, 11:07

Okay, the kinked hose makes sense. I don't really get to fiddle too much as I was mid-water, and at that time just wanted to get to the stop depth, and then out of the water. It all works okay now on the surface and in bits, so I'll just bear it in mind for the future - thanks guys

Mike - I was out with QDC on Nemo. Certainly made a change from last Sunday when we didn't even get through the rip to the J1!! Like I said, it was one of those rare (for me) moments when everything just seems to come together.

25th June 2007, 02:40	#1 (permalink)
simon varley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: geelong, VIC Posts: 33	one of those moments I had one of those moments yesterday. You know, the good ones for a change. The sea was flat, the vis was good, and for once, my buoyancy was spot on. The OC guys were somewhere behind me and I was swimming through one of the J-class submarines. I could see all the way through, and the shoals of fish weren't being disturbed so I just lay there and hovered watching the pretty fishes. Unfortunately the ascent wasn't quite so much fun. Almost as soon as we started to rise up, I had trouble getting a breath. It felt like the loop was empty. I tried harder, and suddenly I got some air, but the WOB had really gone up. All the way up, and through the deco the WOB was really hard. The loop was venting so there was plenty of gas in it. ADV and manual add didn't make any difference, and there was no gurgling sound. O2 control was spot on and I didn't feel out of breath or anything. When I stripped the unit, it was again breathing okay. The only odd thing I could find was a very small amount of water in the inhale CL. Everything else was bone dry. I guess I'm thinking a sticky mushroom valve, but it seems odd that it was working fine on the bottom and just played up on the ascent. Don't know what else would suddenly increase the WOB though, so if anyone's got any ideas I'd be very greatful to hear them regards Simon
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25th June 2007, 04:08	#2 (permalink)
PCDiver Submerge Productions Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: Belgium Posts: 907	Re: one of those moments Perhaps a kinked hose?
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25th June 2007, 04:38	#3 (permalink)
simon varley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: geelong, VIC Posts: 33	Re: one of those moments Quote: (Originally Posted by PCDiver) Perhaps a kinked hose? could be I guess - changing from horizontal in the water, to vertical for the ascent might have just twisted things a bit
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25th June 2007, 07:06	#4 (permalink)
ianskip New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Apr 2006 Location: New Zealand Posts: 6	Re: one of those moments I recently had an experience where at the beginning of the dive my breathing felt strange with some added WOB. This unnerved me so I fiddled with hoses and mouthpiece and soon discovered the mouthpiece wasn't fully open. It was a very simple problem to sort but for a short time it was a worry. Maybe your mouthpiece could have rotated and become partially closed.
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25th June 2007, 08:15	#5 (permalink)
Mike Prism 'prentice Current Rebreather/s: Prism Topaz Other Rebreather/s: Inspiration Classic Evolution Join Date: Feb 2005 Location: Melbourne Posts: 322	Re: one of those moments Another vote for kinked hose - I've experienced it twice on inspos. Watch the surge on the subs Who were you diving with? I was intending to get out, but didn't get all the pieces of my breather back together in time. Mike __________________ Open ....... Closed Mind ........ Loop
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25th June 2007, 08:27	#6 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,774	Re: one of those moments Quote: (Originally Posted by Mike) Another vote for kinked hose - I've experienced it twice on inspos. 3rd vote for kinked hose? I've experienced the same thing a few times and it was a kinked hose from the DSV, never from the head to the CLs as those hoses on the Prism are thicker than the DSV hoses. Made me wish that the DSV hoses were more rigid, but then it would be less easy to move my head around...
(Online)

25th June 2007, 11:07	#7 (permalink)
simon varley New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: geelong, VIC Posts: 33	Re: one of those moments Okay, the kinked hose makes sense. I don't really get to fiddle too much as I was mid-water, and at that time just wanted to get to the stop depth, and then out of the water. It all works okay now on the surface and in bits, so I'll just bear it in mind for the future - thanks guys Mike - I was out with QDC on Nemo. Certainly made a change from last Sunday when we didn't even get through the rip to the J1!! Like I said, it was one of those rare (for me) moments when everything just seems to come together.
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