VR3 BUH or VPM

Drmike

Excellant!, Ill take two please, and dont wrap them, Ill wear them home

should reach hotel by 9:30pm - ill give you a call then to hook up

cheers
m

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Wreck diving is a sport
Diving in general is a sport

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its the delusional obsession with a highly dangerous and often inappropriate piece of equipment

Lancer4545

Just back from a day out at the reef and it appears to have been a BIG day here too

Getting onto my reasoning for the stops I am considering following when I use both the VR3VPM and the VR3BUH........

On these type dives my thinking is to follow the VR3VPM which is stopping me sooner/deeper than the VR3BUH and follow these stops which are all deeper than the VR3BUH.

Then once the VR3VPM has cleared ALL the deco, halve the remaining VR3BUH deco and then surface.

On the dive I initally quoted, the VR3BUH kept me at the 6m stop for another 60mins, which I did and cleared that computer also.

So instead of hanging around for an additional hour after the computer I was following had cleared me, only remain half that time which should pad the deco stops enough to further offgas enough to safely surface without getting bent. Or just stay a little longer for peace of mind........What every you like to call it.

Like Stuey wrote in his post, he was always a stop above me and I noted his VR3BUH and Vision were roughly at the same stop depth as my VR3BUH at the time, except when we were at the 6m stop. The vision and VR3 with the 4th cell monitoring the loop PO2 should have reduced his deco compared to me running fixed set point monitoring on both my VR3s.

Interesting to see none of the Deco Specialists have made any contribution to the thread........

I for one would certainly like to see what they have to say on the subject.

Lance

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diverklondike

Mike,

My bad in not explaining it properly... They are keeping to their "He" DIL but feeling that the BUHL based GF is overly peanalizing them for "He" and therefore lie to the computer and tell the computer that they have switched to an Air DIL at the first stop.

Not my cup of tea but I know it's being done.

M

Meng_Tze

That is a fair point

Yes it is a company's prerogative to keep their IP close to the chest. But if these secrets also include that they are selling something it is not.... I question their ethics at a minimum. I do not think a customer should have to dig and ask, this information should be available, especially when it creates such confusion, heated debates. This also touches customer satisfaction and company /brand image. A company in touch with their customer sentiments, would address these, keeping stum is one way to do things, but in light of these (and there have been many over the years) discussions, probably not the smartest.

As for forcing disclosure, that is not what I was thinking, I was thinking more along the lines of business ethics, customer satisfaction, customer retention and gaining/keeping market share.

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Meng_Tze

B/E

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rossh

The deepest known for V-Planner Live / X1 so far, is 110-120m this past weekend on the Princess of Orient. VPM-B+3.

All X1's are pressure tested to 300m. The V-Planner Live firmware operation has been tested to 650m, and to 30 hours of dive time. Divers can pre-run any dive with the included dive simulator, which runs the dive through the real algo and firmware.

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Hanssing

Any chance we can get the vplive-file to look through?

Nicolai

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swadiver

yadda,yadda,yadda.........................

Gasman

Hi all,

Without getting into to the emotive replies that this topic always creates, here are the facts as we presently understand them.

There have been 3 studies so far conducted specifically looking at deep stops in the technical diving range. 2 are human, (a French Navy study and a USN study) and an animal study from Alf Brubakk’s group in Norway. None of these studies has specifically looked at VPM. However, they have compared dive profiles where the total dive time is the same in each profile but one profile has deep stops and the other doesn’t.

The results:

The French navy study showed higher ultrasound bubble rates in the deep stop group and where a repetitive dive was conducted, there was a higher DCI rate in the deep stop group.

The USN had to stop the study early because the divers in the deep stop group were getting spinal cord DCI at a rather alarming rate.

The Animal study was stopped early because the pigs in the deep stop group died.


While more studies need to be done, it would appear from the presently available data that deep stops are not living up to their promise. This is not totally unexpected as, if one trawls the literature, there were attempts to use deep stops to produce decompression profiles for deep (500 ft) dives in the 1980’s. It didn’t work too well then either, with many of the test divers getting bent and a considerable “tweaking” of the algorithm needed to get it to work…… and in the end the TDT was much greater than the “traditional” algorithm which also worked.

We have seen a fairly high DCI rate in people using a bubble model for deep dives (up to 25%) including two recent cases of spinal cord DCI. In addition we recently ultrasounded divers after 75m dives of 30-40 BT (CCR, Trimix diluent) and observed grade 4+ bubbling in those using the deep stop / bubble algorithm. I had never seen bubbling of this level before outside of a lab during echo contrast studies.

Before anyone asks I will not comment on specific algorithms on this forum. Take the above information and make your own decisions.


Andrew

Dsix36

Maybe I am the only one, but I have learned a couple of things from this thread.

By the way - did you get the tanks banded?

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