RE: Wings and back plates

["Johnstone,H,NAID,JOHNSTH M" <JOHNSTH@xxxxxxxxxxxxxxxx>]

On Jan 07, 1998 01:16:21, John wrote:

>My example was to demonstrate the misnomer created by some manufacturers
>that you double the available lift by adding a second bladder.  There's
>nothing wrong with kilos but a lot of manufacturers quote lift in lb's.

OMS don't, AFAIK, play on this. In the bumph which came with the wing, it 
specifically stated that you should NOT inflate both wings together - one 
was a truely redundant wing to be used if the other was mis-functioning.

>>> The other problem with a second bladder is that it's another hose with 
>>> another LP port used on your reg - hence more failure points.
>>
>>You don't need a second LP hose on your regs.  You can either inflate it 
>>orally (even blowing against the bungees), or you can disconnect the
>>LP hose from bladder #1 and connect it to bladder #2.

>Oral inflation is not ideal - it involves removing and replacing your
>primary reg many times.  It is less efficient and it adds stress to a
>stressful situation.

Agree. Not a good solution.

>Disconnecting the hose is not a good idea -
>particularly as most dual bladder wings have one hose on each side.
>Therefore the LP hose probably will not reach the second inflator hose.
>Again, this comes back to creating one problem in order to solve another. 

But there is another cleaner solution. I have removed the second wing 
inflate (which cleans up the first stage configuration and reduces another 
failure point) and attached the end of the redundant inflator hose via a 
piston-clip to the bottom bungee on the right side of the wing (so is 
easily found, removable but tucked out of the way).  I've changed my 
dry-suit inflate so it can be used to inflate either bladder as well as my 
dry-suit. So, I've got a wing inflate whip and a dry-suit inflate whip, 
either of which can be disconnected and re-used on either of the 2 bladders 
or the dry-suit, with minimal fuss. However, in the case of my main bladder 
wing failing, my first reaction would be to use the dry-suit as a backup 
inflate and avoid the hose switching.

In my 'normal' diving, I don't need the second bladder. However, when I got 
it a couple of years ago, it was virtually the only one on the market here. 
If I bought now, I would probably go for the SeaTec wing, although I would 
like to try one first (Graeme, Andy, Sue ... can I borrow one of yours - 
and one of your scooters sometime :-).

>How long
>does it take you to realise that there is a problem, release your 
secondary
>hose and transfer the lp hose to it?  I'll bet that it takes a lot longer
>than it takes me to press the inflator on my drysuit!

Yup, so I would use my dry-suit as my main backup. However, what would you 
use as a backup if you were, say, diving in warm-water with a wet-suit on? 

- Helen
---------------------------------------
Helen Johnstone
johnsth@xxxxxxxxxxx
Work:	01473 224439
Mobile: 0802 156741




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