Pony or Octopus

[Jay]

Here's another version from Divers Warehouse in Bradford.

Regards

[andy2tanx]

Thats right Jay we do use inverted cylinders and sometimes we even twin up for a BIG job!

Maybe soon I will have my twins inverted, its something i have thought about for quite a while now.

[desperate dave]

On the question Pony or Octapus
I wish I had a Pony but even better than that would be a twin set and a pony...I quote my mum "Safety first you be careful" so I use this to try to persuade her to get me a twin set

[Cut throat Jake]

Well Dave, regarding the Pony my lad wants one but he is going to have to make do with a Hamster this year!
The advice from your mum sounds cool too. Always listen to your mum and you won't go far wrong Dave, might not have much fun though!  

[Scoff]

I guess none of you chaps have ever seen cave divers with side-mounted twenties then???

Only way to go one better would be to take J Cylinders!!!:cheesy:

Cheers

[Hobby]

The concensus is right(I reckon),octopus rigs are no substitue for a redundant set up done properly.Your point re. freeflows is correct,most if not all 1st stages are designed to supply one 2nd stage.The fact that they will supply an additional 2nd most of the time is beside the point as you can use a welly boot to carry water if you get my drift.There are many reasons,I've got an old but good article that BSAC refused to print over here but was in the US (and Scotland!) re.this if you're interested.Inverting is a good way to do it(redundancy),not sure about the need for valve guards,don't need them with Sabres a la RN sets.Probe diving can get custom ones made up reasonably.Cheers.

[Ammers]

Twinverts tsk tsk...that's for slobs!  :wavey: Whoops did I just start a fight? Why not invest in a slob winder remote :outtahere: and get the tanks in the right position - there should be no problem reaching them then unless you are accident damaged or a slob hehehehe :sofa:

[divedog]

But what happens if your fat and your arm is too short to wipe your arse !!
:unitaz:

[Jay]

Isn't a 'slob knob' another piece of equipment that can go wrong? Wouldn't you need two or even three (one for each tank and a third for the manifold isolator?

I spoke to a guy on my DM course who does tank inspections and reg tune-ups and he says you shouldn't invert because:

1. When vertical, the ist stage is at a greater pressure than your second stage because they are not level with each other and this can provide greater breathing resistance at depth and
2. If you have corrosion in your tank, there is a risk of particles becoming lodged in your 1st stage (due to gravity)

I don't know how true this is but I would be interested in other opinions from those of you who dive twinsets.

Regards

[divedog]

Intresting .. but the Royal Navy have been using this method, tried and tested for many years. If you picture the horizontal diver with the positions of the 1st and 2nd stage, you will notice that there is very little difference at all. Regarding the resistance of the breathing, I have felt more resistance when I have been upside down vertical like doing a headstand or bombing to the bottom to get on that wreck before the current takes you off it, I also think that if you did have corrosion and water/oil in your cylinder you would never know until too late, at depth. When you dive, before you always connect your 1st stage you should blast out any debris/water before you fit it. If your cylinder was inverted a quick blast on a white hankerchief would indicate if there was any residue, water or crap in your cylinder before you connected it and caused damage to your reg and moreso yourself when you dip head first through the hold of a wreck or gully, as regarding a guard, me thinks if you paying for quality first stages and using them with inverted twins, then you would be a fool not to guard them.
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