How to handle both DSMB and loop volume while bailing out ?

Francois · 24th March 2006, 15:43

Hi

I am pretty new in this funny world of CCR diving

I began CCR diving two weeks ago, and I use a 'rEvo', a small series mCCR.

During one dive last week, I suspected a water entry in the loop and decide to make an ascent in OC bailout. I find it was not so easy to control the loop volume while ascending in OC : I need the two hands to open periodically the DSV to dump gas.

So, I want to ask a (maybe stupid) question : how do you handle a DSMB deployment while ascending in OC : two hands to dump gas with the DSV, one hand for the DSMB's reel, I miss one, no ?

***Beanie*** · 24th March 2006, 15:46

If I needed two hands for the unit and one ofr the SMB I'd not bother reeling the SMB in.
I'm assuming you've not got a dump on your unit

Drmike · 24th March 2006, 15:47

Quote: (Originally Posted by Francois)

So, I want to ask a (maybe stupid) question : how do you handle a DSMB deployment while ascending in OC : two hands to dump gas with the DSV, one hand for the DSMB's reel, I miss one, no ?

Empty wing. As you ascend CL will expand until full then the opv will maintain CL volume all the way up - you only have to worry about controlling wing volume then

decoweenie · 24th March 2006, 15:50

Does the revo have an OPV ?

Francois · 24th March 2006, 15:52

Quote: (Originally Posted by Beanie)

If I needed two hands for the unit and one ofr the SMB I'd not bother reeling the SMB in.

Well, it's an option, but if you are drifting over a shallow bottom thing can begin to be a bit tricky, no ?

Quote:

I'm assuming you've not got a dump on your unit

Got a dump, but it's localised at the bottom of inspiration CL, so, it's a difficult to use it to dump manually (it dumps only on overpressure, but, at this point loop volume had reached a value making me truly buoyant)

Drmike · 24th March 2006, 15:53

if no opv is fitted (fit one) or you will have to control cl volume by going back top the loop and sucking/blowing on way up....dont forget to turn off your unit!

Francois · 24th March 2006, 16:00

Quote: (Originally Posted by Drmike)

Empty wing. As you ascend CL will expand until full then the opv will maintain CL volume all the way up - you only have to worry about controlling wing volume then

Of course, I did empty the wing, (switching to CCR diving dont make you forget your basic diving skill, no ?

) and suit dump was full open. But, even with wing empty, the volume of the loop maitained by the OPV make me positive, so I need to empty the loop manually in all case.

**trob09** · 24th March 2006, 16:04

Quote: (Originally Posted by Francois)

Well, it's an option, but if you are drifting over a shallow bottom thing can begin to be a bit tricky, no ?

Got a dump, but it's localised at the bottom of inspiration CL, so, it's a difficult to use it to dump manually (it dumps only on overpressure, but, at this point loop volume had reached a value making me truly buoyant)

My solution is based on the meg's configuration, so things may be different for you, but

I have OPV on the left-side counter-lung
Exhaust valve on the left shoulder
Dump valve on the lower-left lobe of the wing

Assuming you're maintaining horizontal trim, open the OPV on the lung and the exhaust valve on the drysuit. When you need to dump gas, roll to the right so that your left side is highest. Now you will dump gas from both the suit and the loop automatically and with one hand you can reach back & dump gas from the wing.

Roll back to horizontal when done.

Francois · 24th March 2006, 16:06

Quote: (Originally Posted by Drmike)

if no opv is fitted (fit one) or you will have to control cl volume by going back top the loop and sucking/blowing on way up....dont forget to turn off your unit!

As mentioned above, I have an opv, but before it opens, the volume reached by the loop make me buoyant. So i have to dump manually (I did it withjout sucking the DSV, but opened the DSV with mouthpiece turned down)

Drmike · 24th March 2006, 16:33

Quote: (Originally Posted by Francois)

Of course, I did empty the wing, (switching to CCR diving dont make you forget your basic diving skill, no ?

) and suit dump was full open. But, even with wing empty, the volume of the loop maitained by the OPV make me positive, so I need to empty the loop manually in all case.

I wasnt trying to be funny or a smart ass I was trying to help.

I was making the point that you try to as much as possible only have only one main source of lift to worry about. If you completely empty your wing at depth you can come up quite a way by controlling just the CL volume only.

This can be done naturally letting the opv do its job and fine tuning with the wing, or, if the CL volume is too big (too bouyant even when wing is empty) you can suck n blow, or you can try crossing one arm (the one holding the reel) over one or if possible both CLs and keep it tight to your chest to minimise CL volume/lift and let OPV work whilst fine tuning with wing as before.

If all else fails just take it in stages alternating wing emptying, suit dumping and loop suck n blowing in turns....works for me.

I bailed from 80m once and everytimne I went back to the loop as I ascended to suck and blow I couldnt work out why I couldnt empty the lungs...took me a while to realise I hadnt shut off the ADV

24th March 2006, 15:43	#1 (permalink)
Francois New Member Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Dec 2005 Location: Girona, Spain Posts: 11	How to handle both DSMB and loop volume while bailing out ? Hi I am pretty new in this funny world of CCR diving I began CCR diving two weeks ago, and I use a 'rEvo', a small series mCCR. During one dive last week, I suspected a water entry in the loop and decide to make an ascent in OC bailout. I find it was not so easy to control the loop volume while ascending in OC : I need the two hands to open periodically the DSV to dump gas. So, I want to ask a (maybe stupid) question : how do you handle a DSMB deployment while ascending in OC : two hands to dump gas with the DSV, one hand for the DSMB's reel, I miss one, no ? __________________ François "If redundancy is not your epigraph, stupidity might be your epitaph" (Gary Gentile)
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24th March 2006, 15:46	#2 (permalink)
*Beanie* Cheif tea maker Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,141	Re: How to handle both DSMB and loop volume while bailing out ? If I needed two hands for the unit and one ofr the SMB I'd not bother reeling the SMB in. I'm assuming you've not got a dump on your unit __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk www.divelife.co.uk
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24th March 2006, 15:47	#3 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,100	Re: How to handle both DSMB and loop volume while bailing out ? Quote: (Originally Posted by Francois) So, I want to ask a (maybe stupid) question : how do you handle a DSMB deployment while ascending in OC : two hands to dump gas with the DSV, one hand for the DSMB's reel, I miss one, no ? Empty wing. As you ascend CL will expand until full then the opv will maintain CL volume all the way up - you only have to worry about controlling wing volume then __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you Last edited by Drmike : 24th March 2006 at 15:50.
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24th March 2006, 15:50	#4 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Re: How to handle both DSMB and loop volume while bailing out ? Does the revo have an OPV ? __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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24th March 2006, 15:52	#5 (permalink)
Francois New Member Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Dec 2005 Location: Girona, Spain Posts: 11	Re: How to handle both DSMB and loop volume while bailing out ? Quote: (Originally Posted by Beanie) If I needed two hands for the unit and one ofr the SMB I'd not bother reeling the SMB in. Well, it's an option, but if you are drifting over a shallow bottom thing can begin to be a bit tricky, no ? Quote: I'm assuming you've not got a dump on your unit Got a dump, but it's localised at the bottom of inspiration CL, so, it's a difficult to use it to dump manually (it dumps only on overpressure, but, at this point loop volume had reached a value making me truly buoyant) __________________ François "If redundancy is not your epigraph, stupidity might be your epitaph" (Gary Gentile)
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24th March 2006, 15:53	#6 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,100	Re: How to handle both DSMB and loop volume while bailing out ? if no opv is fitted (fit one) or you will have to control cl volume by going back top the loop and sucking/blowing on way up....dont forget to turn off your unit! __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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24th March 2006, 16:00	#7 (permalink)
Francois New Member Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Dec 2005 Location: Girona, Spain Posts: 11	Re: How to handle both DSMB and loop volume while bailing out ? Quote: (Originally Posted by Drmike) Empty wing. As you ascend CL will expand until full then the opv will maintain CL volume all the way up - you only have to worry about controlling wing volume then Of course, I did empty the wing, (switching to CCR diving dont make you forget your basic diving skill, no ? ) and suit dump was full open. But, even with wing empty, the volume of the loop maitained by the OPV make me positive, so I need to empty the loop manually in all case. __________________ François "If redundancy is not your epigraph, stupidity might be your epitaph" (Gary Gentile)
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24th March 2006, 16:04	#8 (permalink)
trob09 . Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2005 Posts: 685	Re: How to handle both DSMB and loop volume while bailing out ? Quote: (Originally Posted by Francois) Well, it's an option, but if you are drifting over a shallow bottom thing can begin to be a bit tricky, no ? Got a dump, but it's localised at the bottom of inspiration CL, so, it's a difficult to use it to dump manually (it dumps only on overpressure, but, at this point loop volume had reached a value making me truly buoyant) My solution is based on the meg's configuration, so things may be different for you, but I have OPV on the left-side counter-lung Exhaust valve on the left shoulder Dump valve on the lower-left lobe of the wing Assuming you're maintaining horizontal trim, open the OPV on the lung and the exhaust valve on the drysuit. When you need to dump gas, roll to the right so that your left side is highest. Now you will dump gas from both the suit and the loop automatically and with one hand you can reach back & dump gas from the wing. Roll back to horizontal when done.
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24th March 2006, 16:06	#9 (permalink)
Francois New Member Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Dec 2005 Location: Girona, Spain Posts: 11	Re: How to handle both DSMB and loop volume while bailing out ? Quote: (Originally Posted by Drmike) if no opv is fitted (fit one) or you will have to control cl volume by going back top the loop and sucking/blowing on way up....dont forget to turn off your unit! As mentioned above, I have an opv, but before it opens, the volume reached by the loop make me buoyant. So i have to dump manually (I did it withjout sucking the DSV, but opened the DSV with mouthpiece turned down) __________________ François "If redundancy is not your epigraph, stupidity might be your epitaph" (Gary Gentile)
(Offline)

24th March 2006, 16:33	#10 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,100	Re: How to handle both DSMB and loop volume while bailing out ? Quote: (Originally Posted by Francois) Of course, I did empty the wing, (switching to CCR diving dont make you forget your basic diving skill, no ? ) and suit dump was full open. But, even with wing empty, the volume of the loop maitained by the OPV make me positive, so I need to empty the loop manually in all case. I wasnt trying to be funny or a smart ass I was trying to help. I was making the point that you try to as much as possible only have only one main source of lift to worry about. If you completely empty your wing at depth you can come up quite a way by controlling just the CL volume only. This can be done naturally letting the opv do its job and fine tuning with the wing, or, if the CL volume is too big (too bouyant even when wing is empty) you can suck n blow, or you can try crossing one arm (the one holding the reel) over one or if possible both CLs and keep it tight to your chest to minimise CL volume/lift and let OPV work whilst fine tuning with wing as before. If all else fails just take it in stages alternating wing emptying, suit dumping and loop suck n blowing in turns....works for me. I bailed from 80m once and everytimne I went back to the loop as I ascended to suck and blow I couldnt work out why I couldnt empty the lungs...took me a while to realise I hadnt shut off the ADV __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you Last edited by Drmike : 24th March 2006 at 16:40.
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