GF's on Shearwater and Vision

diverklondike · 21st June 2007, 10:57

Quote: (Originally Posted by dave t)

I meant the moving ceiling. GF's are pretty much accepted as good stuff

To my knowledge the only other computer I have seen with a moving ceiling was the "skinnydipper" made by a company called orca, (actually I still have one) was in my opinion well ahead of its time. was based on a bubble model as far as I can remenber

Dave

ps I think GF's are the dogs danglies!! but you need to understand them and how they work

Cochran uses a moving ceiling with a very different algo.

Scubascooby · 21st June 2007, 12:17

Quote: (Originally Posted by dave t)

To my knowledge the only other computer I have seen with a moving ceiling was the "skinnydipper" made by a company called orca, (actually I still have one) was in my opinion well ahead of its time. was based on a bubble model as far as I can remenber

That was an expensive piece of kit when it came out. Never seen one, I don't
recall it being very popular maybe because of the price. I seem to remember that Diver mag were impresses when they tested it.

Ben Field · 21st June 2007, 12:38

Quote: (Originally Posted by Scubascooby)

I seem to remember that Diver mag were impresses when they tested it.

So that pretty much sealed its fate then....

**PhilSiswick** · 21st June 2007, 12:42

Quote: (Originally Posted by dave t)

Phil

I my experience it doesnt seem to make much difference once you are at 6m. I have tried it both ways and came to the conclusion there was maybe only a minute or two difference. I feel more comfortable staying at 6m as I guess thats what I have always done but its nice to have the flexibility, for instance when decoing in the red sea it means I can mooch around on the reef looking at the beasties and not worry too much about my depth as long as Im under my ceiling.

I have to say there are some critics for this type of deco but it works for me even from fairly deep dives

Dave

Hi Dave,

Thanks again - that's good to know. I've always felt happier staying a bit deeper (6 vs 3) for the final stage of deco, but have been forced shallower by Suunto in recent years to avoid spending the rest of my life burning off the last minutes of a long deco at 6m!

Cheers,

prharris · 21st June 2007, 12:45

Quote: (Originally Posted by Ben Field)

So that pretty much sealed its fate then....

Didn't Orca also make 'The Edge', a comp that you clipped to your mask strap and it would talk to you to tell you depth and deco info?

Or was that the 'Bono'

r
P

dave t · 21st June 2007, 13:49

yes they did make the edge but it was a huge alloy brick, I doubt you could clip it to your mask unless you had neck muscles like arnie,s arms

dave t · 21st June 2007, 13:58

Quote: (Originally Posted by dave t)

Phil

I my experience it doesnt seem to make much difference once you are at 6m.

Dave

I should probably quantify this by saying I guess the longer your stop time at 6m the longer the difference between following the ceiling and sitting at 6m.

I was talking to a friend who told me on a deep dive (90m) he shortened the deco by some 20mins by sticking at (just under) the ceiling all the way to the surface. Dont know anymore details than that but if you sit a long way below your ceiling when deeper, say more than 10 - 15m it will add time to the TTS

Dave

Tom Mount · 25th June 2007, 18:45

Quote: (Originally Posted by prharris)

Didn't Orca also make 'The Edge', a comp that you clipped to your mask strap and it would talk to you to tell you depth and deco info?

Or was that the 'Bono'

r
P

Yep they did and I still have two of them. I had serial numbers one and two but they went down with us in the plane crash- they worked exceptionally well had many good dives on them

the tissue bars were great for controlling dives kind of like a visual GF

Dive!Dive! · 25th June 2007, 23:49

Dave/Ben
You both have the shearwater I believe. Is the last stop configurable or fixed at 6 (or 3) ?
Cheers

Ben Field · 26th June 2007, 08:55

Last stop is at 3mtrs, of course you can do it anywhere between 3 and 6, it seems to clear in about the same time but I've only been diving profiles resulting in 5-10minutes at 3/6, on deeper divers I guess the difference would increase.

FWIW I dive "sloppy 6s" as taught to me when I did my Gas course with the much missed Keith Morris, I think he pinched it off someone else (typical)

Sloppy 6 plan is when you run a plan based on final stop at 6mtrs, then final stop at 3mtrs and compare the difference.

On a 6mtr plan the final stop might be 25minutes, on the 3mtr plan the 6mtr stop is 8 minutes and the 3mtr stop 17minutes... generally/roughly they have the same total (again on radical dives this starts to fall apart but the logic remains (I guess?

))

Then when you dive the profile you do your set 8minutes at 6mtrs, then you split the remaining 17minutes over 5, 4 and 3mtrs, for example 5 at 5, 5 at 4 and 7 at 3 or some similar pattern.

I doubt there is any good reason for this but I figure its an extension of "flying the curve" and my shearwater doesn't seem to mind

21st June 2007, 10:57	#11 (permalink)
diverklondike Just one of the Peasants Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Oct 2005 Location: Delaware, USA Posts: 1,613	Re: GF's on Shearwater and Vision Quote: (Originally Posted by dave t) I meant the moving ceiling. GF's are pretty much accepted as good stuff To my knowledge the only other computer I have seen with a moving ceiling was the "skinnydipper" made by a company called orca, (actually I still have one) was in my opinion well ahead of its time. was based on a bubble model as far as I can remenber Dave ps I think GF's are the dogs danglies!! but you need to understand them and how they work Cochran uses a moving ceiling with a very different algo.
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21st June 2007, 12:17	#12 (permalink)
Scubascooby Better Off Out of the EU Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Nov 2005 Location: Great Britain Posts: 387	Re: GF's on Shearwater and Vision Quote: (Originally Posted by dave t) To my knowledge the only other computer I have seen with a moving ceiling was the "skinnydipper" made by a company called orca, (actually I still have one) was in my opinion well ahead of its time. was based on a bubble model as far as I can remenber That was an expensive piece of kit when it came out. Never seen one, I don't recall it being very popular maybe because of the price. I seem to remember that Diver mag were impresses when they tested it. __________________ "dove" is NOT the past tense of "dive" Better off OUT of the EU ! www.hugsac.org.uk
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21st June 2007, 12:38	#13 (permalink)
Ben Field CK+Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Aug 2005 Location: London, England Posts: 1,621	Re: GF's on Shearwater and Vision Quote: (Originally Posted by Scubascooby) I seem to remember that Diver mag were impresses when they tested it. So that pretty much sealed its fate then.... __________________ Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer and RTFM! Beware Fridge Suck! www.hugsac.org.uk
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21st June 2007, 12:42	#14 (permalink)
PhilSiswick Phil Siswick, Tango Current Rebreather/s: Evolution Other Rebreather/s: Inspiration Vision Join Date: Apr 2006 Location: Oxford, UK Posts: 996	Re: GF's on Shearwater and Vision Quote: (Originally Posted by dave t) Phil I my experience it doesnt seem to make much difference once you are at 6m. I have tried it both ways and came to the conclusion there was maybe only a minute or two difference. I feel more comfortable staying at 6m as I guess thats what I have always done but its nice to have the flexibility, for instance when decoing in the red sea it means I can mooch around on the reef looking at the beasties and not worry too much about my depth as long as Im under my ceiling. I have to say there are some critics for this type of deco but it works for me even from fairly deep dives Dave Hi Dave, Thanks again - that's good to know. I've always felt happier staying a bit deeper (6 vs 3) for the final stage of deco, but have been forced shallower by Suunto in recent years to avoid spending the rest of my life burning off the last minutes of a long deco at 6m! Cheers, __________________ Phil (WSKD 0001) I have always felt that the dive I am on is not nearly important as the dives I plan to be on the rest of my life. Tom Rose, 2007 The person who gets the farthest is generally the one who is willing to do and dare. The sure thing boat never gets far from shore. Charles A. Lindbergh www.hugsac.org.uk
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21st June 2007, 12:45	#15 (permalink)
prharris CK #146 and Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Feb 2005 Location: Plymouth Posts: 106	Re: GF's on Shearwater and Vision Quote: (Originally Posted by Ben Field) So that pretty much sealed its fate then.... Didn't Orca also make 'The Edge', a comp that you clipped to your mask strap and it would talk to you to tell you depth and deco info? Or was that the 'Bono' r P
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21st June 2007, 13:49	#16 (permalink)
dave t Custom Title Allowed! Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 654	Re: GF's on Shearwater and Vision yes they did make the edge but it was a huge alloy brick, I doubt you could clip it to your mask unless you had neck muscles like arnie,s arms
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21st June 2007, 13:58	#17 (permalink)
dave t Custom Title Allowed! Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 654	Re: GF's on Shearwater and Vision Quote: (Originally Posted by dave t) Phil I my experience it doesnt seem to make much difference once you are at 6m. Dave I should probably quantify this by saying I guess the longer your stop time at 6m the longer the difference between following the ceiling and sitting at 6m. I was talking to a friend who told me on a deep dive (90m) he shortened the deco by some 20mins by sticking at (just under) the ceiling all the way to the surface. Dont know anymore details than that but if you sit a long way below your ceiling when deeper, say more than 10 - 15m it will add time to the TTS Dave
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25th June 2007, 18:45	#18 (permalink)
Tom Mount New Member Current Rebreather/s: Inspiration Classic Evolution Megalodon Sport Kiss Classic Kiss Optima Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: USA Posts: 96	Re: GF's on Shearwater and Vision Quote: (Originally Posted by prharris) Didn't Orca also make 'The Edge', a comp that you clipped to your mask strap and it would talk to you to tell you depth and deco info? Or was that the 'Bono' r P Yep they did and I still have two of them. I had serial numbers one and two but they went down with us in the plane crash- they worked exceptionally well had many good dives on them the tissue bars were great for controlling dives kind of like a visual GF
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25th June 2007, 23:49	#19 (permalink)
Dive!Dive! Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2006 Location: Somerset, UK Posts: 94	Re: GF's on Shearwater and Vision Dave/Ben You both have the shearwater I believe. Is the last stop configurable or fixed at 6 (or 3) ? Cheers
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26th June 2007, 08:55	#20 (permalink)
Ben Field CK+Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Aug 2005 Location: London, England Posts: 1,621	Re: GF's on Shearwater and Vision Last stop is at 3mtrs, of course you can do it anywhere between 3 and 6, it seems to clear in about the same time but I've only been diving profiles resulting in 5-10minutes at 3/6, on deeper divers I guess the difference would increase. FWIW I dive "sloppy 6s" as taught to me when I did my Gas course with the much missed Keith Morris, I think he pinched it off someone else (typical) Sloppy 6 plan is when you run a plan based on final stop at 6mtrs, then final stop at 3mtrs and compare the difference. On a 6mtr plan the final stop might be 25minutes, on the 3mtr plan the 6mtr stop is 8 minutes and the 3mtr stop 17minutes... generally/roughly they have the same total (again on radical dives this starts to fall apart but the logic remains (I guess? )) Then when you dive the profile you do your set 8minutes at 6mtrs, then you split the remaining 17minutes over 5, 4 and 3mtrs, for example 5 at 5, 5 at 4 and 7 at 3 or some similar pattern. I doubt there is any good reason for this but I figure its an extension of "flying the curve" and my shearwater doesn't seem to mind __________________ Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer and RTFM! Beware Fridge Suck! www.hugsac.org.uk
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