double hose regulators...what happened?

[duckbill]

BTW, electric windows do work underwater (fresh or salt water).

I didn't know that. Good to know. Thanks.

Added:
I just found this page that says that neither will work to open a window under water until the pressures have equalized, but also confirmed what you said, Luis, that the circuitry and motor themselves would still work underwater.
http://mythbustersresults.com/episode72

 

[Slonda828]

The kind of man that cannot comprehend at even the smallest level why a diver would want to dive a restored vintage piece of diving equipment is the same type of guy that looks at a Shelby GT350 and says "Oh, it's just a Mustang. Why did some guy pay so much money for that?" Then he gets into his brand new 6,000 dollar Hyundai and wonders why it drives like a pack of gum with 4 skinny tires affixed to it.

 

[Luis H]

I totally agree about the technology not really changing, and in fact I would say that regulators have not really improved over the last several decades, hence the constant attempts by the dive gear industry to sell regs with lots of gimmicks and very marginal upgrades.

I'm not sure about the statement "The only difference between a double hose and a single hose is the exterior packaging."

I know that you mean that the valves of both 1st and 2nd stages are functionally the same in both single and double hose regs, and of course you're right. But, I would argue that the placement of 1st and 2nd stages in the cans, with the hoses at ambient pressure, as opposed to a single pressurized hose and a 2nd stage right at your mouth, is a more substantive difference than "exterior packaging" because it does in fact change the way the regulator acts in relation to the diver.

The fact that air is de-pressurized several inches from your mouth really changes the feel of the reg, and of course the double hose regs are much more sensitive to position. I personally don't think one is "better" than the other, but I find them to be pretty different.

I also totally agree... read my last sentence: "Obviously the case makes a big difference on how they perform and it is part of the technology, but that technology has been around for a while also."


It is kind of the difference between an aerobatic biplane and a 747... They are both subsonic planes (not the same as a supersonic wing) and their wings work on the same principles, but the performance is very different due to the geometry, etc.

I am using different case and different geometry (as in flow geometry) kind of interchangeably. I wasn't just referring about the looks.

Heck, case change is what I did with the Phoenix. That has change function and performance, but it is still the same technology.

The flow technology is not only very important, it is probably one of the most important parts of regulator design, but that technology has only progressed a little. I don't see most regulator designers using modern high end computational fluid dynamics modeling software. I have seen a little, but it is still mostly done from empirical testing just like Emile Gagnan did it 60+ years ago.

 

[Slonda828]

Luis, you make me smarter every time I read one of your posts.

 

[Luis H]

I didn't know that. Good to know. Thanks.

Added:
I just found this page that says that neither will work to open a window under water until the pressures have equalized, but also confirmed what you said, Luis, that the circuitry and motor themselves would still work underwater.
MythBusters Episode 72: Underwater Car

Yep... that is why I said: "to escape from a flooded vehicle."

 

[NAM001]

wow what do you supposed folks would think if they knew in those days you could get them in single or double stage models. they make them still today i think i saw a usdivers double hose a year ago new off the production line. ebay had a gold plated cousteau double for 1700.00, i dont remember if it sold however it came with a jaques cousteau signed document fo some sort as it was supposed to be a present to a friend of cousteau. its comes in a nice wooden box

 

[John C. Ratliff]

KWS,

I think the one you saw was a Gold Aquamaster, which was made in the 1980s. The New Mistral also came in a collector's edition, but it was discontinued about four years ago.

SeaRat

 

[NAM001]

KWS,

I think the one you saw was a Gold Aquamaster, which was made in the 1980s. The New Mistral also came in a collector's edition, but it was discontinued about four years ago.

SeaRat

i believe you are absolutely right. i only mentioned it because of the cousteau certificate and teh gold plating and of course the price. did i forget that most think they DH are not made any more and a thing in the very very distant past.

 

[Luis H]

KWS,

I think the one you saw was a Gold Aquamaster, which was made in the 1980s. The New Mistral also came in a collector's edition, but it was discontinued about four years ago.

SeaRat

What?
The Gold Royal Aqua Master were made in (or around) 1968 for the 25 anniversary of Cousteau's first "Aqua Lung" dives.

There were no Aqua Masters made in the 1980's.

 

[vshearer]

.. did i forget that most think they DH are not made any more and a thing in the very very distant past.

I guess I am a thing of the distant past. :depressed: