Getting of the Helium?

Depth-junkie · 22nd August 2005, 19:23

i dont if this is right or wrong as i am new to CCR but i am OC trimix qualified, i am waiting for my new inspo with vision elec's to be deliverd nov/dec then starting my course

the only reason i can see to do a diluent flush with a 02 richer trimix is to save gas in the inboard 02, as on accent the CCR is trying to keep a high set point from a low 02 dilutent mix and suerly this is burning a lot of inboard 02 gas.

I cant see any other reason as surely with a high setpoint the mix in the loop is going to be quite simiar wether a dil of 6/70 or 20/30 is being used, as the 02% fraction is the same at a given depth (i.e 23% 02 @ 45m on 1.3set point) the only diff is the high helium dil will have less N2 and more helium than the 30/30. E.G 6/70 dil gas in loop @ 45m will be 23/61.5 while the 20/30 will be 23/28.5 (will this flush alter the deco much?)

this is my thinking but please correct me if i am wrong as this is the kind of info i will find usefull as after the winter when i get my experience up on my unit, i will be looking to some mix dives on the unit next summer

.

Cheers
Gareth
CCR muppet!!!!!

Deepwreck · 22nd August 2005, 19:33

Quote: (Originally Posted by Depth-junkie)

i dont if this is right or wrong as i am new to CCR but i am OC trimix qualified, i am waiting for my new inspo with vision elec's to be deliverd nov/dec then starting my course

the only reason i can see to do a diluent flush with a 02 richer trimix is to save gas in the inboard 02, as on accent the CCR is trying to keep a high set point from a low 02 dilutent mix and suerly this is burning a lot of inboard 02 gas.

I cant see any other reason as surely with a high setpoint the mix in the loop is going to be quite simiar wether a dil of 6/70 or 20/30 is being used, as the 02% fraction is the same at a given depth (i.e 23% 02 @ 45m on 1.3set point) the only diff is the high helium dil will have less N2 and more helium than the 30/30. E.G 6/70 dil gas in loop @ 45m will be 23/61.5 while the 20/30 will be 23/28.5 (will this flush alter the deco much?)

this is my thinking but please correct me if i am wrong as this is the kind of info i will find usefull as after the winter when i get my experience up on my unit, i will be looking to some mix dives on the unit next summer

.

Cheers
Gareth
CCR muppet!!!!!

You missed the point.
The increased HE in the loop is the cause of some additional time on deco. Sometimes as much as 20min. The Computers like the N in the loop and penalize you for HE on deco. Yet the truth is that HE is better for you and N is worse. By staying on a 10/70 mix for the whole dive, but telling your tables or computer to switch to air at around 100 will reduce your deco time by as much as 20min on longer dives. I only do this on deeper longer dives, as I don't mind adding a few min to deco, but 15 to 20min is not fun in 39degree water. Just to be clear thats 15 or 20min on top of your regurlar deco of around 50 to 70min.

Depth-junkie · 22nd August 2005, 19:52

I have not missed the point, i know the computers dont like helium deco and by telling your software that you have got off the helium will in fact get you out faster,but keeping helium in the loop is better for the diver I.E tell computer switch to air @30m with 1.3 SP but stay with the mix Dil and deco out on air profile .

My point is i cant see a reason for switching a diluent from a low 02 mix to a high 02 mix other than to save the inboard 02, as the 02 fraction will be the same regardless, and the helium diff surely wont change the deco that much as whilst accending the helium% will be decreasing and the 02 rising as the ccr injects 02 into the loop.
Ok may be on extreme dives sub 100m and long BT this may not be the case but for normal trimix depths 50-80m ish dives surely there is not that much benefit/deco diff by using a new dilutent and it's better just to stay on the current loop and dil. but if you want to get out a few mins early tell your computer a little white lie and that you have swaped to a air dil.

***Decodiver*** · 22nd August 2005, 20:43

Quote: (Originally Posted by Depth-junkie)

I have not missed the point, i know the computers dont like helium deco and by telling your software that you have got off the helium will in fact get you out faster,but keeping helium in the loop is better for the diver I.E tell computer switch to air @30m with 1.3 SP but stay with the mix Dil and deco out on air profile .

My point is i cant see a reason for switching a diluent from a low 02 mix to a high 02 mix other than to save the inboard 02, as the 02 fraction will be the same regardless, and the helium diff surely wont change the deco that much as whilst accending the helium% will be decreasing and the 02 rising as the ccr injects 02 into the loop.
Ok may be on extreme dives sub 100m and long BT this may not be the case but for normal trimix depths 50-80m ish dives surely there is not that much benefit/deco diff by using a new dilutent and it's better just to stay on the current loop and dil. but if you want to get out a few mins early tell your computer a little white lie and that you have swaped to a air dil.

I use custom supplied tables sub 90 metres.

They are VPM-B +10% deep stops padded with raw Buhlmann +10% Time SF.

Example 30 minutes at 95 metres gives me an in water time of 196 minutes ie 3 hours 16 minutes. Maxing at 114% CNS.

They incorporate a use of a 1.2 setpoint at depth on 6/72 and a 1.4 setpoint on 20/30 from 45 metres and they work fine.

I am not an advocate of a setpoint higher than 1.4 on deco.

In the 50-80 metre range, I agree that there is little point in switching diluent.

Cheers,

Dave Cooper.

rossh · 23rd August 2005, 06:44

Quote: (Originally Posted by Deepwreck)

The increased HE in the loop is the cause of some additional time on deco. Sometimes as much as 20min. The Computers like the N in the loop and penalize you for HE on deco. Yet the truth is that HE is better for you and N is worse. By staying on a 10/70 mix for the whole dive, but telling your tables or computer to switch to air at around 100 will reduce your deco time by as much as 20min on longer dives. I only do this on deeper longer dives, as I don't mind adding a few min to deco, but 15 to 20min is not fun in 39degree water. Just to be clear thats 15 or 20min on top of your regurlar deco of around 50 to 70min.

Can I jump in here? Deco programs do not like one gas over another... they dislike all inert gas - what ever its origin.

The He recurculation effect is rather small. You can simulate the shift in inert ratios in your planning program.. just replan the dive using an increasing He component as you rise through the stops. Do some plans.. on a two hour dive, the worst case will give a few minutes extra. I did some sample plans showing this here: Post # 55

Regards

Barrie Law · 23rd August 2005, 09:59

Quote: (Originally Posted by Decodiver)

I use custom supplied tables sub 90 metres.

They are VPM-B +10% deep stops padded with raw Buhlmann +10% Time SF.

Example 30 minutes at 95 metres gives me an in water time of 196 minutes ie 3 hours 16 minutes. Maxing at 114% CNS.

They incorporate a use of a 1.2 setpoint at depth on 6/72 and a 1.4 setpoint on 20/30 from 45 metres and they work fine.

I am not an advocate of a setpoint higher than 1.4 on deco.

In the 50-80 metre range, I agree that there is little point in switching diluent.

Cheers,

Dave Cooper.

Dave
The run time seems a little excessive to me, as an example I did a dive last week 31mins @ 90 mtrs and I had a total run time of 122 mins with a setpoint of 1.3 with 14/86 dil.
The question I prefer to ask rather than getting of the Helium is do I need the Nitrogen and I am of the opinion that 1 inert gas is enough and Helium is my choice given a 0 EAND and the rate that Helium offgasses.
To maximise the benifit of CCR with a setpoint controlling the PP02 and assuming a gentle ascent rate the Helium has to reflect the balance of the Partial Pressure and so reduces gradually in % on ascent as the 02 % increases and bar pressure decreases this greatly reduces the shallow stops as by the time 6 mtrs is reached most, if not all of the Helium has left the system.
Putting Nitrogen into the loop in no way helps this process and if anything hinders it, the only other considerations I have found is to have Heliox only Bailouts and an insulated scrubber with a more conservative attitude to sofnolime duration.

Cheers

***Decodiver*** · 23rd August 2005, 10:59

Quote: (Originally Posted by Barrie Law)

Dave
The run time seems a little excessive to me, as an example I did a dive last week 31mins @ 90 mtrs and I had a total run time of 122 mins with a setpoint of 1.3 with 14/86 dil.
The question I prefer to ask rather than getting of the Helium is do I need the Nitrogen and I am of the opinion that 1 inert gas is enough and Helium is my choice given a 0 EAND and the rate that Helium offgasses.
To maximise the benifit of CCR with a setpoint controlling the PP02 and assuming a gentle ascent rate the Helium has to reflect the balance of the Partial Pressure and so reduces gradually in % on ascent as the 02 % increases and bar pressure decreases this greatly reduces the shallow stops as by the time 6 mtrs is reached most, if not all of the Helium has left the system.
Putting Nitrogen into the loop in no way helps this process and if anything hinders it, the only other considerations I have found is to have Heliox only Bailouts and an insulated scrubber with a more conservative attitude to sofnolime duration.

Cheers

Hi Barrie,

The tables are certainly conservative but are made for repetitive day in day out diving trips hence the conservatism, what algorithm were you using?

Cheers,

Dave

Barrie Law · 23rd August 2005, 17:33

Quote: (Originally Posted by Decodiver)

Hi Barrie,

The tables are certainly conservative but are made for repetitive day in day out diving trips hence the conservatism, what algorithm were you using?

Cheers,

Dave

Dave
I thought it looked a bit more conservative than standard but I see your point for repetitve dives I was running Vr3 with Bulhman 16 with padded Microbubble stops with a 5mtrs p/m ascent rate and fudge on the TTS, the runtime without the fudge would have been 147mins.

Cheers

Drmike · 24th August 2005, 12:55

Quote: (Originally Posted by Barrie Law)

Dave
The run time seems a little excessive to me, as an example I did a dive last week 31mins @ 90 mtrs and I had a total run time of 122 mins with a setpoint of 1.3 with 14/86 dil.

I am interested in the use of HeO and the results your getting. From the tables the US Navy got developed for their CCR HeO deco (for use in MK16 MOD1 ) they determined run times for such a dive to be 268mins.

VPM-B gives a similar run time. Thats a huge difference in run time from what you guys are achieving.

Im curious to know what the skinny is here. Maybe a new thread on HeO diving would be interesting. I know the good Dr JM has mentioned hes using HeO dils.

Cheers
Mike

Barrie Law · 24th August 2005, 16:11

Quote: (Originally Posted by Drmike)

I am interested in the use of HeO and the results your getting. From the tables the US Navy got developed for their CCR HeO deco (for use in MK16 MOD1 ) they determined run times for such a dive to be 268mins.

VPM-B gives a similar run time. Thats a huge difference in run time from what you guys are achieving.

Im curious to know what the skinny is here. Maybe a new thread on HeO diving would be interesting. I know the good Dr JM has mentioned hes using HeO dils.

Cheers
Mike

Mike
A new thread on HeO would be interesting and possibly productive but I suspect it would only work with an open minded attitude from those viewing it, as I suspect some details may not be 'by the book' the current one at least.
I know a good few divers are running various types of decompression schedules based on Helium and O2 only mixes, I would love to find out more and compare results.
I would also like to run an experiment with as many Heliox divers as possible in there own locations to confirm some results I have been getting.

Cheers

22nd August 2005, 19:23	#11 (permalink)
Depth-junkie 10/52 Psycho Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Aug 2005 Location: Wrexham Posts: 298	i dont if this is right or wrong as i am new to CCR but i am OC trimix qualified, i am waiting for my new inspo with vision elec's to be deliverd nov/dec then starting my course the only reason i can see to do a diluent flush with a 02 richer trimix is to save gas in the inboard 02, as on accent the CCR is trying to keep a high set point from a low 02 dilutent mix and suerly this is burning a lot of inboard 02 gas. I cant see any other reason as surely with a high setpoint the mix in the loop is going to be quite simiar wether a dil of 6/70 or 20/30 is being used, as the 02% fraction is the same at a given depth (i.e 23% 02 @ 45m on 1.3set point) the only diff is the high helium dil will have less N2 and more helium than the 30/30. E.G 6/70 dil gas in loop @ 45m will be 23/61.5 while the 20/30 will be 23/28.5 (will this flush alter the deco much?) this is my thinking but please correct me if i am wrong as this is the kind of info i will find usefull as after the winter when i get my experience up on my unit, i will be looking to some mix dives on the unit next summer . Cheers Gareth CCR muppet!!!!!
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22nd August 2005, 19:33	#12 (permalink)
Deepwreck Custom Title Allowed! Current Rebreather/s: Megalodon Classic Kiss Other Rebreather/s: Join Date: Aug 2005 Location: Minnesota Posts: 114	Quote: (Originally Posted by Depth-junkie) i dont if this is right or wrong as i am new to CCR but i am OC trimix qualified, i am waiting for my new inspo with vision elec's to be deliverd nov/dec then starting my course the only reason i can see to do a diluent flush with a 02 richer trimix is to save gas in the inboard 02, as on accent the CCR is trying to keep a high set point from a low 02 dilutent mix and suerly this is burning a lot of inboard 02 gas. I cant see any other reason as surely with a high setpoint the mix in the loop is going to be quite simiar wether a dil of 6/70 or 20/30 is being used, as the 02% fraction is the same at a given depth (i.e 23% 02 @ 45m on 1.3set point) the only diff is the high helium dil will have less N2 and more helium than the 30/30. E.G 6/70 dil gas in loop @ 45m will be 23/61.5 while the 20/30 will be 23/28.5 (will this flush alter the deco much?) this is my thinking but please correct me if i am wrong as this is the kind of info i will find usefull as after the winter when i get my experience up on my unit, i will be looking to some mix dives on the unit next summer . Cheers Gareth CCR muppet!!!!! You missed the point. The increased HE in the loop is the cause of some additional time on deco. Sometimes as much as 20min. The Computers like the N in the loop and penalize you for HE on deco. Yet the truth is that HE is better for you and N is worse. By staying on a 10/70 mix for the whole dive, but telling your tables or computer to switch to air at around 100 will reduce your deco time by as much as 20min on longer dives. I only do this on deeper longer dives, as I don't mind adding a few min to deco, but 15 to 20min is not fun in 39degree water. Just to be clear thats 15 or 20min on top of your regurlar deco of around 50 to 70min.
(Online)

22nd August 2005, 19:52	#13 (permalink)
Depth-junkie 10/52 Psycho Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Aug 2005 Location: Wrexham Posts: 298	I have not missed the point, i know the computers dont like helium deco and by telling your software that you have got off the helium will in fact get you out faster,but keeping helium in the loop is better for the diver I.E tell computer switch to air @30m with 1.3 SP but stay with the mix Dil and deco out on air profile . My point is i cant see a reason for switching a diluent from a low 02 mix to a high 02 mix other than to save the inboard 02, as the 02 fraction will be the same regardless, and the helium diff surely wont change the deco that much as whilst accending the helium% will be decreasing and the 02 rising as the ccr injects 02 into the loop. Ok may be on extreme dives sub 100m and long BT this may not be the case but for normal trimix depths 50-80m ish dives surely there is not that much benefit/deco diff by using a new dilutent and it's better just to stay on the current loop and dil. but if you want to get out a few mins early tell your computer a little white lie and that you have swaped to a air dil.
(Offline)

22nd August 2005, 20:43	#14 (permalink)
*Decodiver* Administrator Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,181	Quote: (Originally Posted by Depth-junkie) I have not missed the point, i know the computers dont like helium deco and by telling your software that you have got off the helium will in fact get you out faster,but keeping helium in the loop is better for the diver I.E tell computer switch to air @30m with 1.3 SP but stay with the mix Dil and deco out on air profile . My point is i cant see a reason for switching a diluent from a low 02 mix to a high 02 mix other than to save the inboard 02, as the 02 fraction will be the same regardless, and the helium diff surely wont change the deco that much as whilst accending the helium% will be decreasing and the 02 rising as the ccr injects 02 into the loop. Ok may be on extreme dives sub 100m and long BT this may not be the case but for normal trimix depths 50-80m ish dives surely there is not that much benefit/deco diff by using a new dilutent and it's better just to stay on the current loop and dil. but if you want to get out a few mins early tell your computer a little white lie and that you have swaped to a air dil. I use custom supplied tables sub 90 metres. They are VPM-B +10% deep stops padded with raw Buhlmann +10% Time SF. Example 30 minutes at 95 metres gives me an in water time of 196 minutes ie 3 hours 16 minutes. Maxing at 114% CNS. They incorporate a use of a 1.2 setpoint at depth on 6/72 and a 1.4 setpoint on 20/30 from 45 metres and they work fine. I am not an advocate of a setpoint higher than 1.4 on deco. In the 50-80 metre range, I agree that there is little point in switching diluent. Cheers, Dave Cooper. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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23rd August 2005, 06:44	#15 (permalink)
rossh Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jul 2005 Location: Canada Posts: 111	Quote: (Originally Posted by Deepwreck) The increased HE in the loop is the cause of some additional time on deco. Sometimes as much as 20min. The Computers like the N in the loop and penalize you for HE on deco. Yet the truth is that HE is better for you and N is worse. By staying on a 10/70 mix for the whole dive, but telling your tables or computer to switch to air at around 100 will reduce your deco time by as much as 20min on longer dives. I only do this on deeper longer dives, as I don't mind adding a few min to deco, but 15 to 20min is not fun in 39degree water. Just to be clear thats 15 or 20min on top of your regurlar deco of around 50 to 70min. Can I jump in here? Deco programs do not like one gas over another... they dislike all inert gas - what ever its origin. The He recurculation effect is rather small. You can simulate the shift in inert ratios in your planning program.. just replan the dive using an increasing He component as you rise through the stops. Do some plans.. on a two hour dive, the worst case will give a few minutes extra. I did some sample plans showing this here: Post # 55 Regards __________________ Regards, Ross Hemingway V-Planner Live for the X1 V-Planner VPM-B Nitrox Trimix CCR Deco planning for Technical Divers www.v-planner.com
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23rd August 2005, 09:59	#16 (permalink)
Barrie Law RebreatherWorld Sponsor Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Ireland Posts: 459	Getting of the Helium? Quote: (Originally Posted by Decodiver) I use custom supplied tables sub 90 metres. They are VPM-B +10% deep stops padded with raw Buhlmann +10% Time SF. Example 30 minutes at 95 metres gives me an in water time of 196 minutes ie 3 hours 16 minutes. Maxing at 114% CNS. They incorporate a use of a 1.2 setpoint at depth on 6/72 and a 1.4 setpoint on 20/30 from 45 metres and they work fine. I am not an advocate of a setpoint higher than 1.4 on deco. In the 50-80 metre range, I agree that there is little point in switching diluent. Cheers, Dave Cooper. Dave The run time seems a little excessive to me, as an example I did a dive last week 31mins @ 90 mtrs and I had a total run time of 122 mins with a setpoint of 1.3 with 14/86 dil. The question I prefer to ask rather than getting of the Helium is do I need the Nitrogen and I am of the opinion that 1 inert gas is enough and Helium is my choice given a 0 EAND and the rate that Helium offgasses. To maximise the benifit of CCR with a setpoint controlling the PP02 and assuming a gentle ascent rate the Helium has to reflect the balance of the Partial Pressure and so reduces gradually in % on ascent as the 02 % increases and bar pressure decreases this greatly reduces the shallow stops as by the time 6 mtrs is reached most, if not all of the Helium has left the system. Putting Nitrogen into the loop in no way helps this process and if anything hinders it, the only other considerations I have found is to have Heliox only Bailouts and an insulated scrubber with a more conservative attitude to sofnolime duration. Cheers __________________ Barrie Law Rebreather World Store Supplying the Rebreather World Tel:US +19548403892 Fax:US+19543333792 Tel:EU+442071930496 Fax:EU+442077606344 Mobile+353876880628 Skype:barrielaw Email: barrie@rebreatherworldstore.com
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23rd August 2005, 10:59	#17 (permalink)
*Decodiver* Administrator Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,181	Quote: (Originally Posted by Barrie Law) Dave The run time seems a little excessive to me, as an example I did a dive last week 31mins @ 90 mtrs and I had a total run time of 122 mins with a setpoint of 1.3 with 14/86 dil. The question I prefer to ask rather than getting of the Helium is do I need the Nitrogen and I am of the opinion that 1 inert gas is enough and Helium is my choice given a 0 EAND and the rate that Helium offgasses. To maximise the benifit of CCR with a setpoint controlling the PP02 and assuming a gentle ascent rate the Helium has to reflect the balance of the Partial Pressure and so reduces gradually in % on ascent as the 02 % increases and bar pressure decreases this greatly reduces the shallow stops as by the time 6 mtrs is reached most, if not all of the Helium has left the system. Putting Nitrogen into the loop in no way helps this process and if anything hinders it, the only other considerations I have found is to have Heliox only Bailouts and an insulated scrubber with a more conservative attitude to sofnolime duration. Cheers Hi Barrie, The tables are certainly conservative but are made for repetitive day in day out diving trips hence the conservatism, what algorithm were you using? Cheers, Dave __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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23rd August 2005, 17:33	#18 (permalink)
Barrie Law RebreatherWorld Sponsor Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Ireland Posts: 459	Getting of the Helium? Quote: (Originally Posted by Decodiver) Hi Barrie, The tables are certainly conservative but are made for repetitive day in day out diving trips hence the conservatism, what algorithm were you using? Cheers, Dave Dave I thought it looked a bit more conservative than standard but I see your point for repetitve dives I was running Vr3 with Bulhman 16 with padded Microbubble stops with a 5mtrs p/m ascent rate and fudge on the TTS, the runtime without the fudge would have been 147mins. Cheers __________________ Barrie Law Rebreather World Store Supplying the Rebreather World Tel:US +19548403892 Fax:US+19543333792 Tel:EU+442071930496 Fax:EU+442077606344 Mobile+353876880628 Skype:barrielaw Email: barrie@rebreatherworldstore.com
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24th August 2005, 12:55	#19 (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: 3,325	Quote: (Originally Posted by Barrie Law) Dave The run time seems a little excessive to me, as an example I did a dive last week 31mins @ 90 mtrs and I had a total run time of 122 mins with a setpoint of 1.3 with 14/86 dil. I am interested in the use of HeO and the results your getting. From the tables the US Navy got developed for their CCR HeO deco (for use in MK16 MOD1 ) they determined run times for such a dive to be 268mins. VPM-B gives a similar run time. Thats a huge difference in run time from what you guys are achieving. Im curious to know what the skinny is here. Maybe a new thread on HeO diving would be interesting. I know the good Dr JM has mentioned hes using HeO dils. Cheers Mike __________________ 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
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24th August 2005, 16:11	#20 (permalink)
Barrie Law RebreatherWorld Sponsor Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Ireland Posts: 459	Getting of the Helium? Quote: (Originally Posted by Drmike) I am interested in the use of HeO and the results your getting. From the tables the US Navy got developed for their CCR HeO deco (for use in MK16 MOD1 ) they determined run times for such a dive to be 268mins. VPM-B gives a similar run time. Thats a huge difference in run time from what you guys are achieving. Im curious to know what the skinny is here. Maybe a new thread on HeO diving would be interesting. I know the good Dr JM has mentioned hes using HeO dils. Cheers Mike Mike A new thread on HeO would be interesting and possibly productive but I suspect it would only work with an open minded attitude from those viewing it, as I suspect some details may not be 'by the book' the current one at least. I know a good few divers are running various types of decompression schedules based on Helium and O2 only mixes, I would love to find out more and compare results. I would also like to run an experiment with as many Heliox divers as possible in there own locations to confirm some results I have been getting. Cheers __________________ Barrie Law Rebreather World Store Supplying the Rebreather World Tel:US +19548403892 Fax:US+19543333792 Tel:EU+442071930496 Fax:EU+442077606344 Mobile+353876880628 Skype:barrielaw Email: barrie@rebreatherworldstore.com
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