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Post by Gomez' echo on Jun 29, 2006 4:42:43 GMT -8
You are definitely correct on the two fins. However the Aquatic snorkel was not marketed in 1962 by Voit. But being very observant students, if Voit is not correct and we have all checked off the used matching combinations, then we can deduce that the Aquatic snorkel was marketed by . . . . . . . . . . USD.
Thanks John for getting this questions out of the way. Either this one was more difficult or this vintage trivia thread has lost it pazazz. Anyway, dear friend, the floor is yours. Allan
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Post by SeaRat on Jun 29, 2006 5:16:49 GMT -8
Okay, how do you add ten to the minus 4 (exponent) plus ten to the minus six (exponent), divide by 2, and get ten to the minus 3.996 (exponent)? Just kidding, but that's what brought me to my computer--I'm still learning my quantitative industrial hygiene, and trying to re-learn some of my basic chemistry and math that I last saw in high school (which was a few years back). This question is one involving adding two equal volumes of pH 4 and pH 6 water, and finding the correct pH. So I'll work on this one, but here's the trivia question.
This has to do with the development of the venturi concept, which we are discussing on a different thread. What is the name and designation of the first regulator (United States) to come with a venturi assist, and what was unique to that concept that has never been repeated? This is a double hose regulator.
John
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Post by SeaRat on Jul 3, 2006 11:19:59 GMT -8
Well, nobody has bitten on this question, so here are a few hints. First, the discussion in the first paragraph has nothing to do with the question, only a frustration I had with a book's industrial hygiene question. It turns out that the printed answer is wrong (correct answer: 4.3). Now, concerning the question, here it is again: HINT: I discussed this regulator in the thread "Base Standard": vintagescuba.proboards2.com/index.cgi?board=general&action=display&n=1&thread=703&page=2John
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JohnA
Pro Diver
Posts: 134
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Post by JohnA on Jul 5, 2006 12:33:47 GMT -8
Since it has been up awhile, I will give it a try; quoting directly from your post:
US Divers DX Overpressure
"it has a "hose within a hose" concept, where the venturi air is piped in a small interior hose directly to a metal mouthpiece. There, it is re-directed through several holes in the metal tube in the mouthpiece right directly down the diver's thoat. This is the venturi concept which really puts the venturi in the mouthpiece, with almost no hose loss as the small inner hose is smooth, and has a lower volume. This venturi air then drags th diaphragm down, and secondary air is sent through the outer hose"
John
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Post by SeaRat on Jul 7, 2006 22:11:00 GMT -8
JohnA, You got it, so the floor is yours. 'Sorry about taking a few days to reply, but I've been on vacation. I'll try getting a scan of the parts diagram of the DX Overpressure regulator posted here this weekend. Time for you to post your question. Thanks for working on this one. John PS--I got a few minutes, and was able to scan this image out of Rick and Barbara Carrier's book, dive, the complete book of skin diving, Wilfred Funk, Inc., New York, 1957 (First Edition), page 161: I think that this concept, of a hose-within-a-hose, deserves a bit more examinition. According to Fred Roberts, the regulator breathed too easily for the divers of that day, and therefore quickly became the DY and DW Mistral. He also said that the Mistral achieved performances approaching the DX Overpressure Breathing regulator, but without the downside. Of interest to me is the statement that the Mistral "approaches" the performance of the DX Overpressure. I'll explain more on the modern doublehose regulator thread. jcr
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JohnA
Pro Diver
Posts: 134
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Post by JohnA on Jul 8, 2006 4:16:22 GMT -8
Here we go,
What was the name of the regulator and name the company that developed that regulator that had 2 basically independent 1st stages in one “housing” that would automatically inflate (that company’s) BC if the diver stopped breathing or tank pressure went below 500 psi. Needs to be the original name of the company. Developed in the mid to late 70's.
John
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Post by broxton on Jul 12, 2006 6:37:27 GMT -8
Would that be the Watergill FS CS -100?
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JohnA
Pro Diver
Posts: 134
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Post by JohnA on Jul 12, 2006 7:05:20 GMT -8
You are right (although its the FSDS-100) You get the next question. John
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Post by broxton on Jul 12, 2006 13:18:37 GMT -8
We'll make this an easy one.
How many different models of double hose regs did Sportsways make and what were their names?
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Post by SeaRat on Jul 14, 2006 20:24:03 GMT -8
Well, this has been sitting here for a few days, and like a fisherman with his hook in the water too long, I'm going to give it a try. Sportsways made two double hose regulators, the Duel Air and the Hydro-Twin. The Duel Air featured a spring-biased unbalanced diaphragm first stage, and a tilt valve second stage. It had a HP port, as its first stage was built off the single hose Master Diver first stage. It also had one LP port, but that was largely unusable as it had a pressure relief valve stuck in it because of the tilt valve second stage. The Hydro-Twin was a vast improvement, in that it had an improved first stage and downstream second stage. The first stage was balanced, and so allowed the diver to use a nice high interstage pressure to get very good breathing characteristics from the regulator. I bought one from a guy's garage for $25 in the 1980s, and thought it was a Duel Air, until I got it home and took it apart. I was startled to find the balanced first stage and conventional, downstream second stage with a very well-designed venturi assist. It had to be well-designed, as the hose system was not good. It was poorer than Dacor's double hose mouthpiece, but better than Healthways (not the Hope-Page, but the later Healthways, hose system). I put a USD hose/mouthpiece system on it, and have been diving it ever since. This regulator is as close to the new Aqualung Mentor as a ventage regulator ever got. It had one LP and one HP port, and the LP could handle a splitter to give three LP outlets. And, it was a balanced regulator. If they had put on a USD hose system, or an improved Hope-Page system, it would probably have overtaken the DA Aquamaster as a regulator of choice. I don't think US Divers would have let them use their Kleer-Easy hose/mouthpiece system either, and I heard somewhere that there may have been litigation from USD that made them stop production too. Both there regulators also had a mushroom valve for their exhalation valve, and a neoprene impregnated nylon diaphragm which is almost indestructable (much like the Healthways Scuba regulators). I'll try to get a photo of my Hydro-Twin to post here soon. In the meantime, a Japanese site for antique scuba units has this schematic posted of the Sportsways Hydro-Twin: home.a03.itscom.net/koda/AntiqueScuba/05_Museum/museum.htmThey have posted a lot more info here: home.a03.itscom.net/koda/AntiqueScuba/John
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Post by broxton on Jul 14, 2006 22:32:39 GMT -8
I must first say that I like your very detailed description of Sportsways fine two hosers, but their was actually one more regulator. It's a minor detail, a variation on the name. A hint is that the Hydro Twin was not balanced and was only out for one year, 1963.
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Post by Gomez' echo on Jul 15, 2006 3:38:43 GMT -8
Now I feel like a real tag-a-long. The Reg I think Broxton is refering to is the Hydro Twin II, which was introduced as the balanced double hose in 1964. If this is right, than the three are:
Dual Air, Hydro Twin, and Hydro Twin II
Seeing as how SeaRat did all the work and I just "scabbed" in, if this answer is right, SeaRat deserves the next question. Allan
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Post by broxton on Jul 15, 2006 6:36:44 GMT -8
That is correct!!
I'll let Allan & John decide who will take the next question.
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Post by Gomez' echo on Jul 15, 2006 8:00:04 GMT -8
John can as I am out in the water for the next week. I won't be back until next Sunday. Go for it SeaRat!!!!! Allan
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Post by SeaRat on Jul 17, 2006 20:10:23 GMT -8
I haven't gotten a photo of my Hydro-Twin yet, but I can give this series of questions:
--Who are only persons ever to be both an astronaut and an aquanaut (that's right, there is more than one)? --What habitats did they inhabit, and what spacecraft did they fly in? --What years did they work underwater and in space?
John
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