Al

An update on our VR3 discussions from last week...

Sadly, we have sunny but windy conditions this weekend in the UK and only
managed one dive to 56m on a very well dived wreck.  I kept the dive short as
I had a wee problem (as it were) with my P-valve :-).

I was not diving with the diver with the VR3, but from discussion afterwards
he did a slow descent (i.e. less ABT, since he left on a his scheduled RT) as
the shotline had been pulled down by the preceding divers.  He left at 23
minutes RT with a total in water time of 75 minutes.  I believe "zero" safety
was used on the VR3.  The VR3 diver was diving 16/44 and 40% and 80% deco
gasses.  Most of the profile apparently was at the max depth.

In contrast, I did my usual descent reaching the bottom just after 3 minutes
and leaving at 27 minutes RT.  I did the following deco:

(Key: Depth 	Stop/RunTime)

55	24/27	Actual	on 15/50
33	1/30	1
30	1/31	1
27	1/32	1
24	2/34	1
21	1/35	4	on 50%
18	2/37	1
15	2/39	2
12	3/42	3
9	5/47	5
6	14/61	13/61	on O2

(The second column is what my tables said, the third column is what I
executed.)

I took 4 minutes to reach the surface from 6m, thus arriving at 65 minutes.
My max depth was 56.4m and spent most of the time scootering around the max
depth, but ascended over the wreck twice.  I dived 15/50, 50% and O2.  Thus I
had 10 minutes less deco for at least 4 minutes longer on the bottom.

Had I left the bottom at 23 minutes, like the VR3 diver, following a normal
descent I would have left the 6m stop at 51 minutes, hitting the surface at
55 minutes exactly 20 minutes less deco on this short dive.

To make a further comparison, were I to dive the same gasses as the VR3 diver
(16/44, 40% and 80%), arrive on the bottom at 3 and leave at 23, I would have
the following profile:

55	20/23
33	1
30	1
27	1
24	1
21	1
18	1
15	1
12	2
9	4
6	11/45

and reach the surface at 49.  So the closest comparison without looking at
the actual downloaded profile is 75 minutes in water vs. 49 minutes for the
same bottom time.

I'll have a look at the VR3 diver's profile when he downloads it, but expect
that the swim time down would reduce the ABT and therefore the difference in
deco would be greater.  Naturally, I felt great after the dive, apart from
slight discomfort from a rib which had been injured in an earlier non-diving
sports injury.

Perhaps Norman may now better understand my comments:

>I refer to VR3s as wrist weights.  If you prefer to spend your dive time
>doing deco rather than on the wreck, then the VR3 is the dive computer for
>you. 

David Shimell
shimell@se*.co* <mailto:shimell@se*.co*> 
DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343
Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd,
Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK
registered in England and Wales under company number: 1999363, registered
office as above

-----Original Message-----
From:	Shimell, David (shimell) [SMTP:shimell@se*.co*]
Sent:	Tuesday, June 13, 2000 9:30 AM
To:	Al Marvelli; Norman Woods
Cc:	techdiver@aquanaut.com
Subject:	RE: VR3

Al

From some comments made after a Trimix dive, the deco was similar to Proplan
with 10% safety.  The VR3 was set to zero safety.  We have some 80m stuff
coming up this weekend, so I'll have a chat with the owner of the VR3.

David Shimell
shimell@se*.co* <mailto:shimell@se*.co*> 
DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343
Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd,
Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK
registered in England and Wales under company number: 1999363, registered
office as above

-----Original Message-----
From:	Al Marvelli [SMTP:ajmarve@ba*.ne*
Sent:	Tuesday, June 13, 2000 8:28 AM
To:	Norman Woods
Cc:	Shimell, David (shimell); techdiver@aquanaut.com
Subject:	Re: VR3

 i dont have access to one of these and i was wondering what kind of numbers
it
spits out.

David maybe you could hunt down a profile or two from one of these other
users?

rgds,

Al Marvelli

Norman Woods wrote:

> David
>     Its only opinions do not take it to serious. You Play with your toys
and
> I will play with mine. Ask your friend if you can look at his programme
Ver.
> 3. If your happy with the results I am happy.
> Take care
> Norman
> ---------------------------------------------------------------
> Norman Woods
> Coleraine N Ireland
> normanwoods@no*.fr*.co*.uk*
> www.norglen.freeserve.co.uk
>
> > >Strange I find it quite the opposite. Never did like the Oceanic. Did
you
> > >Know the VR3 has a default safety which you can adjust.
> >
> > I am aware of the adjustable so-called safety.  I understand that the
> diver
> > using the VR3 had the so-called safety set to zero at the time.
> >
> > Perhaps you'd like to publish a download profile for a typical wreck dive
> and
> > we can compare your VR3 profile with what I would do on tables.
> >
> > David Shimell
>
> --
> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
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