CL and DPVs

**Robert Landreth** · 16th July 2005, 18:41

Hi Guys and Gals, I haven't yet used my CCR with over the shoulder CL with a DPV yet, although I have logged a considerable amount of time on my DPV with OC. What I am wondering how dues the force of the water do to being towed by the DPV effect the the proper function of the dump valve on CL and breathing. I know that in high current there have been some problems even on the shot line causing the diver to have to turn his back to the current. and in one case even lose gas do the force of the water compressing the CL and causing the dump valve to exhaust gas and therefore lose diluent gas. Any thoughts?
Thanks. Robert

Doorduijn, Niels · 16th July 2005, 19:18

Robert,

I use an Inspiration in combination with a Silent Submerge scooter. I have noticed no differences in breathing effort or with regard to the over pressure valve on the unit. I did notice the drag of the convulted hoses, when scootering longer, but not enough to be an issue. Take care though, that the prop wash does not hit the convulted hoses when you have your jaws relaxed.

Rgs,

Niels Doorduijn

ROB DAVIE · 17th July 2005, 01:10

Quote: (Originally Posted by Doorduijn, Niels)

Robert,

I use an Inspiration in combination with a Silent Submerge scooter. I have noticed no differences in breathing effort or with regard to the over pressure valve on the unit. I did notice the drag of the convoluted hoses, when scootering longer, but not enough to be an issue. Take care though, that the prop wash does not hit the convoluted hoses when you have your jaws relaxed.

Rgs,

Niels Doorduijn

Sounds like a story you can tell about that last sentence, Niels!

silent running · 17th July 2005, 01:45

Hello Robert, I dive a Prism like you and while I've yet to do any scootering, I have been in some prettty stiff currents (3-5knot) and have suffered no ill effects with reguards to CL dumping, but I keep my dump valve screwed down all the way. I have occaisionaly had an unitinetional triggering of the dill add valve in the current when I turned into it with my right side. But this was easily corrected by turning the other way and I'm told there is a way to position the dill add to prevent this but I'm out of the water untill next month. Happy scooting-Andy

Drmike · 17th July 2005, 15:34

I notice the difference between scootering with an (ots) inspiration and a (rear lung) MK15.5.

I find the inspiration has much more drag and is slower for sure. I dont know if that is due to the CLs but I presume so.

In currents stronger than the scooter - ie. scootering full speed and going backwards! I did not have any problems with the OTS lungs getting squashed or anything like that. Breathing also wasnt effected as far as I could tell.

**Robert Landreth** · 17th July 2005, 23:53

No it would not be a good thing to let your jaw relax to much!

good point Niels. and I agree you really should share that story with us! Andy your mention of the Dill valve actuating would make a lot of since and could even be the reason the diver in strong current I was talking about was losing gas do to the CL being co lapsed by water pressure and activating the Auto Dill valve as well as having the dump valve to lose ore to sensitive a spring in it. Andy time flies and the month will be gone!

And yes Dr Mike that was my concern being under strong current [currents stronger than the scooter - ie. scootering full speed and going backwards! I did not have any problems with the OTS lungs getting squashed or anything like that] ie scootering or just diving, it would seem to me that there should be a noticeable chipmunk effect in current or scootering above 3 knots as Andy mentioned with over the sholder CL.
Robert Landreth

16th July 2005, 18:41	#1 (permalink)
Robert Landreth Supporting Member Current Rebreather/s: Prism Topaz Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Jun 2005 Location: CA USA/ Spain Posts: 38	CL and DPVs Hi Guys and Gals, I haven't yet used my CCR with over the shoulder CL with a DPV yet, although I have logged a considerable amount of time on my DPV with OC. What I am wondering how dues the force of the water do to being towed by the DPV effect the the proper function of the dump valve on CL and breathing. I know that in high current there have been some problems even on the shot line causing the diver to have to turn his back to the current. and in one case even lose gas do the force of the water compressing the CL and causing the dump valve to exhaust gas and therefore lose diluent gas. Any thoughts? Thanks. Robert __________________ If it is broke don't fixit, Bailout!
(Offline)

16th July 2005, 19:18	#2 (permalink)
Doorduijn, Niels Custom Title Allowed! Current Rebreather/s: Inspiration Classic MK 15.X Dolphin Other Rebreather/s: Dolphin Join Date: May 2005 Location: Netherlands Posts: 53	Robert, I use an Inspiration in combination with a Silent Submerge scooter. I have noticed no differences in breathing effort or with regard to the over pressure valve on the unit. I did notice the drag of the convulted hoses, when scootering longer, but not enough to be an issue. Take care though, that the prop wash does not hit the convulted hoses when you have your jaws relaxed. Rgs, Niels Doorduijn
(Offline)

17th July 2005, 01:10	#3 (permalink)
ROB DAVIE Administrator Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: HOUSTON, REPUBLIC OF TEJAS Posts: 1,120	Quote: (Originally Posted by Doorduijn, Niels) Robert, I use an Inspiration in combination with a Silent Submerge scooter. I have noticed no differences in breathing effort or with regard to the over pressure valve on the unit. I did notice the drag of the convoluted hoses, when scootering longer, but not enough to be an issue. Take care though, that the prop wash does not hit the convoluted hoses when you have your jaws relaxed. Rgs, Niels Doorduijn Sounds like a story you can tell about that last sentence, Niels! __________________ [SIZE=2]"CC Rebreathers will become a viable part of tech diving [U]WHEN PIGS FLY[/U]!!"--GI3[/SIZE]
(Offline)

17th July 2005, 01:45	#4 (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: 1,813	Hello Robert, I dive a Prism like you and while I've yet to do any scootering, I have been in some prettty stiff currents (3-5knot) and have suffered no ill effects with reguards to CL dumping, but I keep my dump valve screwed down all the way. I have occaisionaly had an unitinetional triggering of the dill add valve in the current when I turned into it with my right side. But this was easily corrected by turning the other way and I'm told there is a way to position the dill add to prevent this but I'm out of the water untill next month. Happy scooting-Andy
(Offline)

17th July 2005, 15:34	#5 (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: 3,157	I notice the difference between scootering with an (ots) inspiration and a (rear lung) MK15.5. I find the inspiration has much more drag and is slower for sure. I dont know if that is due to the CLs but I presume so. In currents stronger than the scooter - ie. scootering full speed and going backwards! I did not have any problems with the OTS lungs getting squashed or anything like that. Breathing also wasnt effected as far as I could tell. __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
(Offline)

17th July 2005, 23:53	#6 (permalink)
Robert Landreth Supporting Member Current Rebreather/s: Prism Topaz Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Jun 2005 Location: CA USA/ Spain Posts: 38	No it would not be a good thing to let your jaw relax to much! good point Niels. and I agree you really should share that story with us! Andy your mention of the Dill valve actuating would make a lot of since and could even be the reason the diver in strong current I was talking about was losing gas do to the CL being co lapsed by water pressure and activating the Auto Dill valve as well as having the dump valve to lose ore to sensitive a spring in it. Andy time flies and the month will be gone! And yes Dr Mike that was my concern being under strong current [currents stronger than the scooter - ie. scootering full speed and going backwards! I did not have any problems with the OTS lungs getting squashed or anything like that] ie scootering or just diving, it would seem to me that there should be a noticeable chipmunk effect in current or scootering above 3 knots as Andy mentioned with over the sholder CL. Robert Landreth __________________ If it is broke don't fixit, Bailout!
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode