DSMB inflate in cold water - purging

Hello, Imorital!
You wrote on Wed, 21 Jan 2004 17:00:59 -0000:

??>> The DSMBi is very popular on this group but I don't particularly like
I> them.

I> Did you already say why?

No. I suspected I might get told;
+ I should like them,
+ I am obviously inadequate for not liking them
+ The technique I find so easy is actually very complex, dangerous and
should not be used by anyone ever


??>> I was offered one cheap so bought it, used it a couple times and then
??>> went back to using the exhaust because I find it quicker and easier.

I> Do you make mid-water deployments?

Just about every time. Usually whilst finning upwards, sometimes drifting
down tide a little.

The slacks around here are short so my ascents are usually off slack and I
find it easier to deploy in mid water. Also saves messing up my drysuit

Regards
MattS

On Wed, 21 Jan 2004 10:29:24 +0000, Pete Young wrote:

> That said, my vote also goes to 5mm 3-finger mitts. I've got a pair
> that I bought in Norway with 'Scandinavian Model' emblazoned on them.
> They're long enough to completely cover the wrist seal on my suit.

I've just ordered some Posiedon 3 fingered mitts. Hopefully have them in
time to try out on Sunday.

Jason

--
See http://www.scuba-addict.co.uk/ to view UK dive spaces or add your own.

"David Walker" <wbsdavenews@hotmail.com> wrote in message
news:bukk7h$103$1@wisteria.csv.warwick.ac.uk

> I have kind of tried this before, but I think my main problem was my bubbles
> always missed! I'll have to improve my aim! Pool on Thursday for that one,

the trick is to get your head right over to the right. Far more than you
might expect...

Vic.


--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG

> ??>> The DSMBi is very popular on this group but I don't particularly
like
> I> them.
>
> I> Did you already say why?
>
> No. I suspected I might get told;
> + I should like them,
> + I am obviously inadequate for not liking them
> + The technique I find so easy is actually very complex, dangerous and
> should not be used by anyone ever
>

So are you going to tell us why then? I always imagine it to be less effort
and perfect every time, with the only disadvantages being cost and bulk.

David

DW> So are you going to tell us why then? I always imagine it to be less
DW> effort and perfect every time, with the only disadvantages being cost
DW> and bulk.

I can discount cost, I paid 43 quid for the bag and bottle.

+ Bulk. Is an issue, but the DSMBi fits in the same pocket as my Normal
DSMB so not a big issue.
+ Simplicity. You can forget to fill the bottle, or maybe not attach it
properly. The bottle could open accidently and you are then relying on a
thin velcro strap to stop it inflating.
+ Handling. I just do not find the DSMBi as intuitive to handle as a normal
DSMB. It can be difficult to fill manually with the bottle attached. The
weight of the bottle folds the DSMBi neck preventing bubbles from getting
in. When I practiced it the method I came up with involved lying back
almost horizontal.
+ Control. Managing the amount of air in the bag by breathing is more
intuitive for me than twisting a valve.
+ Buoyancy. It is negative. If you drop it say bye bye. I once failed to
tie on my normal DSMB when trying to do it in pitch black. The fact it was
floating next to me saved having to go to the backup and the cost of the
bag.
+ Tropophobia. I have made around 500 deployments with a standard DSMB. I
am confident and happy with the technique, it works why change?

One of these points is not a good enough reason to discount the DSMBi but
together I just do not see much point in it. You should learn to deploy
without the bottle for the occassion you forget to fill it. So if you can
do that, why use the bottle at all? I guess there is a danger that if you
only ever use the bottle then you may not be able to inflate it manually
when you need to. I have said elsewhere that I do not like messing with my
normal skills, the techniques I have practiced during hundreds of normal
dives, particularly when something is not going right. YMMV

Regards
MattS

On Thu, 22 Jan 2004 08:41:18 -0000, "matts" <matts@nospam.org> wrote:

>+ Control. Managing the amount of air in the bag by breathing is more
>intuitive for me than twisting a valve.

This one I really don't get. Surely you just crack the bottle and let
it sort itself out with the over pressure valve?

??>> + Control. Managing the amount of air in the bag by breathing is more
??>> intuitive for me than twisting a valve.

I guess you could do it that way but it's not for me. I like to have enough
gas in the DSMB to make it ascend but not enough to lift me before I let it
go. I like to check the reel and everything else is clear before sending
the thing on its way. A couple times the line has looped around the handle
and I have been able to free it before being dragged up. If your DSMB is
lifting you or your crack bottle is open you have a time limit on sorting it
out.

Regards
MattS

On Thu, 22 Jan 2004 13:27:28 -0000, "matts" <matts@nospam.org> wrote:

>??>> + Control. Managing the amount of air in the bag by breathing is more
>??>> intuitive for me than twisting a valve.
>
>I guess you could do it that way but it's not for me. I like to have enough
>gas in the DSMB to make it ascend but not enough to lift me before I let it
>go. I like to check the reel and everything else is clear before sending
>the thing on its way. A couple times the line has looped around the handle
>and I have been able to free it before being dragged up. If your DSMB is
>lifting you or your crack bottle is open you have a time limit on sorting it
>out.

But if you crack it a tiny bit you can probably get a longer time to
sort things out than a manual inflate because you can put less gas in
it because you do not have to have enough to make it fully inflated
once it gets to the surface as it will continue to inflate

"Imorital" <me@privacy.net> wrote in message
news:buotit$kc3bj$1@ID-203763.news.uni-berlin.de

> > Of the three Inspirations
> > I have dived all have had the AutoAir freeflow at some point.
>
> I've got 2, as has a friend.
> Other than a tweak of the 2nd stage when new the only other issue has been
> high IP.

All of mine have suffered from an engraved poppet seal. This makes them
leak.

The fix is trivial. A new seal is fitted in minutes, and costs 10p. Or
you can just use the other side of the one in there...

Vic.


--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG

> A couple times the line has looped around the handle
> >and I have been able to free it before being dragged up. If your DSMB is
> >lifting you or your crack bottle is open you have a time limit on sorting
it
> >out.
>
> But if you crack it a tiny bit you can probably get a longer time to
> sort things out than a manual inflate because you can put less gas in
> it because you do not have to have enough to make it fully inflated
> once it gets to the surface as it will continue to inflate

You don't have crack the bottle so hard that all the gas dumps into the bag.
In fact, it's often best to put a small controlled amount into the bag
first. This causes it to stand up so that you can make sure it's free and
ready to go. Then you can take the reel and let go of the bag without it
taking off. Once happy the bottle can be opened a little more with one hand
and left to fly. Leaving the bottle open ensures the bag is totally full at
the surface.

Sadly I don't see how this is harder than blowing it yourself, but everyone
shoud dive how they see fit. With CCR your options are more limited.

Cheers
Matt.