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Post by nikeajax on Oct 6, 2018 11:38:00 GMT -8
Snarky, that one's SS# 6533: BTW the later ones had a blue-gray label like the Scuba Stars. USD had a stem-valve-gauge that could be attached to the HP-port of the 1030-Calypso-I, it was a tiny thing: I believe these types, like the SP you'd mentioned too, were maybe meant for a pre-dive, to be used in coordination with a wrist-watch? I d'know though... JB
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Post by snark3 on Oct 6, 2018 12:49:05 GMT -8
I have another Scubair from '74 (my dad bought new) that still has the red label but a different first stage, and probably a different second stage although it looks the same.
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Post by nikeajax on Oct 6, 2018 15:11:54 GMT -8
Oh, sorry, I should have said the original diaphragmed-Scubairs, had blue labels on the late models. A '74 is a pretty danged nice reg, not fancy but bulletproof and very robust, and since it's yer dad's, you need to use it JB
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Post by crabbyjim on Oct 9, 2018 8:48:26 GMT -8
Is this thread the start of the rise of the Dacor DH regs? The modifications on the Dacor DH look interesting, something I could never do. However it's very cool. Out of the Dacor DH regs, which one is the best performing? TD TD, The R-4 and all the C-3 have virtually the same first and second stages. There was a rumor of a R-4N that had a balanced first stage, but while advertised, no one has actually seen one. The last of the R-4 series had a duckbill exhaust, as did all the C-3 series, and these would be the best breathing regulators, as the double diaphragm produced quite a bit of internal turbulence in the exhaust air flow, and therefore harder breathing. The double diaphragm R-4 regulators never did pass the U.S. Navy Experimental Diving Unit's specs on exhaust effort. I did an experiment some years ago to try to illustrate the difference between the exhaust flow of a fluid (water) between the different models. I first used what I figured was the best of the duckbill designs, the original DA Aqualung's exhaust duckbill, with a flow of water. Note how the water virtually flows straight out the duckbill without interference. My Sportsways Hydro-Twin, with its fairly large (but not huge) mushroom valve shows considerable back-up of water flowing out the exhaust. My Dacor Dial-a-Breath, with the mushroom in the diaphragm, showed considerable backup of flow of water, which means more resistance to exhalation. The take-away from this is that the duckbill is a better design, as the air (or any fluid) doesn't have to make twists and turns to exit the regulator. This is especially important under heavy demand. John, in light of your research, would you recommend a duckbill exhaust or a duckbill eliminator from VDH?
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Post by SeaRat on Oct 9, 2018 11:59:03 GMT -8
CrabbyJim,
My vote would be for a duckbill, rather than the duckbill eliminator. My reason is not performance as I have not evaluated the duckbill eliminator, but rather that it must be glued into the horn. By the way, the duckbill eliminator is made for USD horns, and not for Dacor. They might work for a Dacor double hose, but I think the dimensions are slightly different.
John
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Post by vance on Oct 9, 2018 21:44:26 GMT -8
The DBE will not fit the Dacor horn. I have installed several in my USD regs. I like them and wish they did fit other regulators.
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Post by vance on Oct 9, 2018 22:00:23 GMT -8
I have a Dacor R-1 or 2 which has 2 tiny clips that secure the shaft for the LP lever. I only have 1 and wonder if anyone knows where to source something similar. Don't even know where to start looking. I can and will, if necessary, make one. It looks like this: The shaft is about .072". Any help would be appreciated!
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Post by nikeajax on Oct 10, 2018 10:59:04 GMT -8
Phil, could you use a wee-Bonnie cir-clip instead? JB
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Post by vance on Nov 11, 2018 12:34:32 GMT -8
I have done some work on my C-2 Clipper with the modded body. I took the drilled up body off and replaced it with a good one from another C-2 I have that is not in great shape. Now one Clipper is in fantastic stock condition. It is a beauty. The one that gets the modded body may not be in great shape, but will serve as the platform for experimenting. Here's the body after filling some of the holes with JB Weld, and some cleanup work. 2 of the 5 holes are not tapped into the LP chamber, but 3 are. I filled the two untapped holes and one of the tapped holes. I believe the JB Weld is more than sufficient to hold up under 120 psig. None of the filled holes had good threads and they were unworkable. This leaves 2 holes with good threads that are tapped into the LP side. I put a port plug in one remaining hole, and a stand-off adapter I made goes in the other. It is more convenient to have a stand-off for the 3 way than to have the 3 way screwed directly into the body due to interference with the yoke. I may silver solder the brass adapter in place after seeing how everything works out. The brass adapter will be shortened by about 3/8".
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Post by technidiver on Nov 11, 2018 13:44:07 GMT -8
I have done some work on my C-2 Clipper with the modded body. I took the drilled up body off and replaced it with a good one from another C-2 I have that is not in great shape. Now one Clipper is in fantastic stock condition. It is a beauty. The one that gets the modded body may not be in great shape, but will serve as the platform for experimenting. Here's the body after filling some of the holes with JB Weld, and some cleanup work. 2 of the 5 holes are not tapped into the LP chamber, but 3 are. I filled the two untapped holes and one of the tapped holes. I believe the JB Weld is more than sufficient to hold up under 120 psig. None of the filled holes had good threads and they were unworkable. This leaves 2 holes with good threads that are tapped into the LP side. I put a port plug in one remaining hole, and a stand-off adapter I made goes in the other. It is more convenient to have a stand-off for the 3 way than to have the 3 way screwed directly into the body due to interference with the yoke. I may silver solder the brass adapter in place after seeing how everything works out. The brass adapter will be shortened by about 3/8". Phil you mentioned using silver solder, would tin solder work on the regs as well? Just wanted to know because a DH project that I'm considering may require some soldering. TD
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Post by vance on Nov 12, 2018 10:32:56 GMT -8
Regular solder can be used on brass, but not easily on something this heavy. Be careful not to use lead solder for anything that will be in the air stream. Silver solder is very strong and flows like buttah. Good, but expensive stuff!
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Post by nikeajax on Nov 12, 2018 11:23:55 GMT -8
Phil, pretty cool: have you tried it yet?
JB
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Post by vance on Nov 13, 2018 14:34:10 GMT -8
I hooked it up to a tank, but had a leaking seat. The ports do work fine. I had my pressure gauge hooked up. I don't think they leak but not for sure with the other leak going on. I think it's the HP seat, since the LP side retains a bit of pressure when the tank is turned off and it leaks down. I haven't changed it yet. I'm working on my Trieste/Titan projects too, so I haven't gotten to it yet.
I was surprised to find that there are two different LP seat carriers for the C-3 and the C-2. The LP carrier and the metal seat in the LP body is much smaller in the C-2!
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Post by vance on Dec 19, 2018 15:11:54 GMT -8
I am planning to make a Dacor IP gauge adapter that fits into the LP body hole. I don't have to if I am willing to disassemble the several Dacors I have and swap the body around, but an adapter would be much more convenient. If they are easy enough to make, I might make a few. I have some ideas, but can't check them now as I'm in Baja California right now. I'm heading for Cabo Pulmo next for some Gulf diving! I was reading an old thread on the early models and got some good ideas for LP seats, including modding the lever to accept a USD seat holder! This is a great forum with intrepid experimenters who come up with great mods!
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Post by nikeajax on Dec 20, 2018 11:21:44 GMT -8
Phil, very much looking forward to what you do: have you talked with Jim Steele about putting some Dacor guts in them to make them balanced?
JB
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