Bent on the VR3?

[johnmaneely]

I'm off up the show sat so I'll just have a word with them then. Hope the compressor is going alright Beanie, your dive at Vobster at the weekend must have been better than ours down here, shockingly awful viz..

[Lanny]

My only experience of being with a diver slavishly following the VR3 on a significant dive was on HMS Prince of Wales 2 years ago. All the dive teams were nicely arranged on the shot at 3m intervals and we all moved up at roughly equal intervals so everyone was happy. Enter VR3 diver stage left, who proceeded to stay deep for ages then breeze through the middle stops, kicking the crap out of everyone else on the line.

He didn't get bent, but very nearly got beaten up towards the end of the trip. We realised we may have trouble with him when he was spotted wearing a snorkel on a 50m+ wreck.

For my own Deco, I was generally using Decoplanner and then "shaping the curve", but am using ratio more and more now as I like the simplicity.

If I had a VR3 I would put in on e-bay, buy an Uwatec dive timer and use the rest for a couple of spare scooter batteries.

[Mark Chase]

Originally Posted by Lanny

My only experience of being with a diver slavishly following the VR3 on a significant dive was on HMS Prince of Wales 2 years ago. All the dive teams were nicely arranged on the shot at 3m intervals and we all moved up at roughly equal intervals so everyone was happy. Enter VR3 diver stage left, who proceeded to stay deep for ages then breeze through the middle stops, kicking the crap out of everyone else on the line.

This is crap...


50m for 60min on a VR3
18/45 back gas, 32 & 80 for deco

1 @ 36
1 @ 29
1 @ 24
1 @ 21
4 @ 18
7 @ 15
12 @ 12
12 @ 9
60 @ 6

Having done a few deco on the shot dives with dives using every concevable type of deco the vision of all the divers neetly spaced on the shot at 3m intervalls is quite amusing.

Be carefull regergitateing Georges rubbish.


ATB

Mark Chase

[And]

Originally Posted by Lanny

Enter VR3 diver stage left, who proceeded to stay deep for ages then breeze through the middle stops, kicking the crap out of everyone else on the line.

He can't have understood what he was reading. The VR3 doesn't do deep stops

Andy

[Lanny]

Originally Posted by Mark Chase

This is crap...


50m for 60min on a VR3
18/45 back gas, 32 & 80 for deco

1 @ 36
1 @ 29
1 @ 24
1 @ 21
4 @ 18
7 @ 15
12 @ 12
12 @ 9
60 @ 6

Having done a few deco on the shot dives with dives using every concevable type of deco the vision of all the divers neetly spaced on the shot at 3m intervalls is quite amusing.

Be carefull regergitateing Georges rubbish.


ATB

Mark Chase

Hi Mark,

Not regurgitating George's opinion - personal experience of an actual dive. Although I am entirely willing to believe that the guy in question was doing some bizarre spurious deep stop routine! Most of the divers on the shot were reasonably well spaced and moved up at roughly the same time, due to using similar Deco planning tools and dive times and entering the water at intervals of a couple of minutes. He did make his way through every dive team and give them a kicking - honest! Possibly due to shorter intermediate stops on VR3?

BTW, POW is 67m not 50.

Be careful tarring anyone who has DIR leanings as an Irvine acolyte.

I won't even comment on your choice of deco gasses

Best,

[Mark Chase]

Originally Posted by And

He can't have understood what he was reading. The VR3 doesn't do deep stops

Andy

It does, but not like the ones below the off gassing ceiling that the DOTF boys use,, Isnt that right Ross


DOTF First stop depth 40m

Decoplanner using 10/80GF First stop depth 33m

VPMB sugest off gassing starts at 39m and reduces ascent rate to 9m -min from 40m and to 5m-min from 30 and does the

VPM-B first stop at 27m??

VR3 first stop 34m

Not much in it realy is there

ATB

Mark Chase

[Drmike]

Originally Posted by Lanny

My only experience of being with a diver slavishly following the VR3 on a significant dive was on HMS Prince of Wales 2 years ago. All the dive teams were nicely arranged on the shot at 3m intervals and we all moved up at roughly equal intervals so everyone was happy. Enter VR3 diver stage left, who proceeded to stay deep for ages then breeze through the middle stops, kicking the crap out of everyone else on the line.

Serves you right for breaking rule no.1

[Mark Chase]

Originally Posted by Lanny

Hi Mark,

Not regurgitating George's opinion - personal experience of an actual dive. Although I am entirely willing to believe that the guy in question was doing some bizarre spurious deep stop routine! Most of the divers on the shot were reasonably well spaced and moved up at roughly the same time, due to using similar Deco planning tools and dive times and entering the water at intervals of a couple of minutes. He did make his way through every dive team and give them a kicking - honest! Possibly due to shorter intermediate stops on VR3?

BTW, POW is 67m not 50.

Be careful tarring anyone who has DIR leanings as an Irvine acolyte.

I won't even comment on your choice of deco gasses

Best,

Your comments on the VR3 are ill informed and sound like your reading from the DIR song sheet rather than talking from experience of using one.

Sorry 65m for 45mins

18/45 back gas in 12s
3ltr 21/35
7tr 32%
7tr 80%

Switch to 21/35 @60m
32% @ 40m
80% @ 10m

Deco on VR3

1 @ 46
1 @ 32
1 @ 27
2 @ 24
4 @ 21
6 @ 18
8 @ 15
12 @ 12
14 @ 9
70 @ 6

CNS 77%


How would you do it DIR??

Oh yes, that's right you couldn’t do this dive

You would need twin 20's and 15ltr stages wouldn’t you

Using twin 12s you would be limited to a 20min bottom time


Using 21/35 have a bottom bailout so it doesn’t matter if I push the back gas beyond thirds, If I lost the deep bailout I could bail out to 32% at 54m If I upped the 21/35 to a 7ltr I could make it out on that and the 80 if I lost the 32 which I would be using for suit inflation.

The choice of deco gasses looks at, back gas limitations, bailout and redundancy. Whilst I pay a price in extending decompression over the use of 100% and less efficient deco I don’t have to worry about air breaks and being able to get on the 80% quicker reduces / negates the need for a 10ltr or 12ltr 02 bottle. Seeing as I can get a good fill on the 80 it is unlikely I will need to go in with a 170bar 02 fill forcing the use of a bigger tank because that’s all they have in the J.

I have read up on the 50% 100% arguments and they are good but not significantly important enough for me to limit my dive to the confines of using them. I have done a lot of diving on 32 & 80 and a few on 21/35 32 & 80 and I feel good after the dive using my old 20/80GFs or the VR3 with my personal added feel good bits. When balancing the benefits of 50 & 100 against the benefits of my system, I found my system wins hands down.

Fortunately I won’t get thrown out of TDI for doing it my way

ATB

Mark Chase

[Fraser]

Your comments on the VR3 are ill informed and sound like your reading from the DIR song sheet rather than talking from experience of using one.

How so? Lanny simply related how he saw a guy using a VR3 on a dive...

Oh yes, that's right you couldn’t do this dive

You would need twin 20's and 15ltr stages wouldn’t you

Is this a troll?

The dive would be done using a stage of bottom gas, but I'm fairly sure you already know that, so why so aggressive?

Fraser.

[And]

Originally Posted by Mark Chase

When balancing the benefits of 50 & 100 against the benefits of my system, I found my system wins hands down.

ATB

Mark Chase

What are the benefits Mark? There might be a decent discussion here after all

Andy