The 'Switching to a Rebreather' Debate.

[angleseydiver]

<font color='#000080'>OK SORRY!
I missed out the the fact it was based on a 21% table
I only posted to point Darren to the &quot;costs involved&quot; thread and threw in a rough example- couldn't be ar*ed doing any proper maths, just picked some approx figures from Bsac Nitrox
tables and Proplanner for Insp.
Yes you can do a similar dive on 40% if you don't mind humping twin-twelves around on a pootle dive and don't mind going to the edge of the MOD.
Do I detect some YBOD -envy from the direction of MSS?
Have fun,
               Terry

[steve-k]

do you think in 20 years from now oc will even be an option?

you dive deeper, longer and safer due to the advancement of your kit

rebreathers are coming into mainstream diving, it is just a mater of time befour we all take them for granted

then you can hang your twins up next to your wet sute and ablj

just make sure you pick an established rebreather with established courses,

[Mark Scott-Simons]

Originally Posted by [b

Quote[/b] ]Yes you can do a similar dive on 40% if you don't mind humping twin-twelves around on a pootle dive

I don't use twin 12's on a 60m dive why would I use them on a 25m dive? As for weight my twin 10's weigh less than a RB plus weight belt - something else I don't need.

Originally Posted by [b

Quote[/b] ] don't mind going to the edge of the MOD.

Sorry but your talking BS again.

Originally Posted by [b

Quote[/b] ]do you think in 20 years from now oc will even be an option?

The navy have been using RB of various types for over 60 years they still haven't given up on OC. They still only use RB for specialist tasks such as mine clearing or sneaking up on an enemy coast line. As these are not things I plan on doing soon, I don't think I'll switch to a RB just yet. Though that's not to say that as technology improves the costs and safety issue may change. Though if you want to peer into a crystal ball the Japanese have tested an artificial gill that extracts Oxygen from sea water. So as long as you can guarantee a flow of 200l/min of water into it who needs an O2 bottle :-)

Originally Posted by [b

Quote[/b] ]rebreathers are coming into mainstream diving

Not at £4400 a pop they wont.

Scotty

[Diving Dude]

Originally Posted by [b

Quote[/b] (Mark Scott-Simons @ April 29 2003,00:06)]

Sorry but your talking BS again.

There you go again Scotty acusing someone of talking BS,

on your last post you were talking about 40% at 25 mtrs which is the mod at 1.4pp

Terry admitted that he didn't state his example was based on 21% however almost everyone who read his post would have assumed that because he didn't sate a mix it was 21%

However you didn't state what mix your &quot;I dive oc for 60 mins at 25 mtrs with no deco&quot; was based on.

I'm not trying to cause an argument, but hey, this forum prides itself on informed discussion and not just acusing people of BS

[Mark Scott-Simons]

Originally Posted by [b

Quote[/b] ]I'm not trying to cause an argument, but hey, this forum prides itself on informed discussion and not just acusing people of BS

When people discuss facts and opinions with me I'll discuss facts and opinions back. If people just state crap then I'll call it what it is. If they want to justify their BS then let 'em. I explained that in response to your earlier post in this thread.

But in answer to you statement re 40% at 25m. Now unless the definitions have changed 1.4 is the partial pressure at the TOD Whereas 1.6 bar is the partial pressure at the MOD. Or at least it was for most if not, all the agencies that I trained with.

Originally Posted by [b

Quote[/b] ]Terry admitted that he didn't state his example was based on 21% however almost everyone who read his post would have assumed that because he didn't sate a mix it was 21%

The argument put forward is typical of the methods employed by RB divers to justify their toys. In this case what was being said was:

If I dive on air for 60mins@ 25m = 20mins stops

If I dive on Nitrox then I only have to do 1 minute.

Said like that where's the argument for using a RB?

Another example of this misleading approach is used by AP in their press ads, which then also give a RB profile that violates their own oxygen exposure limits.

Scotty

[Diving Dude]

Originally Posted by [b

Quote[/b] (Mark Scott-Simons @ April 29 2003,01:36)]1.6 bar is the partial pressure at the MOD. Or at least it was for most if not, all the agencies that I trained with.

Now I could be wrong here, but as I understand it most agencys base there mod on a 1.4pp for the working part of the dive and 1.6 on the stops?

Now come on admit it, you were equally missleading as Terry stating 60mins @25mtrs, with no deco without stating o2%

The saying goes something like......
It takes a big man to admit....................can't remember the rest its late.

If I'm wrong with my coments above I'll admit it openly.........

[Mark Scott-Simons]

Originally Posted by [b

Quote[/b] ]Now I could be wrong here, but as I understand it most agencys base there mod on a 1.4pp for the working part of the dive and 1.6 on the stops?

Whilst I agree with your numbers I will disagree, slightly, with your terminology. The depth limit for the working phase is , or at least was when I was taught, reffered to as the Target Operating Depth, TOD. The 1.6 limit being more cast in stone was called the Maximum Operating Depth, MOD.

That's why I called him on that point. Though do people still teach the different terms?

Originally Posted by [b

Quote[/b] ]Now come on admit it, you were equally missleading as Terry stating 60mins @25mtrs, with no deco without stating o2%

Yep, but as I stated earlier I was playing by his rules.

Scotty

[Diving Dude]

Ahhh.
Now I understand.
The rules are
If someone posts a slightly missleading post-
1.First criticise then reply with equally missleading post.
2.Justify it by claiming playng by someone elses rules.

I should have realised, having brought up three children.

[Mark Scott-Simons]

[Addthe bad]

Twins weighing the same as MY rebreather? &nbsp; no

boys and their toys? &nbsp; &nbsp; er.. &nbsp; .. &nbsp;possibly

Would I go back? No

do I know anyone who has gone back? no


Do I know inspiration who wish they had not spent 4000 when they see my buddies 600 home build ... yep


Does this help Darren 27? &nbsp; &nbsp; &nbsp;Hope so



But I still say go through the twin before moving onto the rebreather. &nbsp;At the very least he'll be able to make an informed decision of one against the other.


I wonder if Mark has tried both twin and rebreather... I think I can guess the answer.

However (Here comes the can of worms!) &nbsp;Just like stating that the is only one way to &quot;Do it right&quot; or any other polarised view- truth is in the eye of the beholder. Ask an Arsenal fan about Man U or Man U about Arsenal. Conservative against Labour. &nbsp;Ferrari against McLarren, Estee Lauder against Mary Quant.... All have advantages ad disadvantages.





Damn I think I'm on the wrong website.


&nbsp; &nbsp; &nbsp; &nbsp;................. Is this Yorkshire Philosphers?