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Post by crabbyjim on Sept 12, 2021 6:38:51 GMT -8
Just a reminder, the next Zoom meeting is Wednesday, September 15, 2021 at 3pm Pacific time. Here is the link:
Di Ann Tarhalla is inviting you to a scheduled Zoom meeting.
Topic: Vintage SCUBA Zoom Meeting Time: This is a recurring meeting Meet anytime
Join Zoom Meeting us06web.zoom.us/j/86242776896?pwd=MjJwZmhTSCszYWxlRmVrQklmb2ZwZz09
Meeting ID: 862 4277 6896 Passcode: 055613 One tap mobile +13462487799,,86242776896#,,,,*055613# US (Houston) +17207072699,,86242776896#,,,,*055613# US (Denver)
Dial by your location +1 346 248 7799 US (Houston) +1 720 707 2699 US (Denver) +1 253 215 8782 US (Tacoma) +1 312 626 6799 US (Chicago) +1 646 558 8656 US (New York) +1 301 715 8592 US (Washington DC) Meeting ID: 862 4277 6896 Passcode: 055613 Find your local number: us06web.zoom.us/u/k6sv0NKA1
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Post by nikeajax on Sept 12, 2021 7:33:41 GMT -8
CJ, I will hopefully be there JB
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Post by vance on Sept 12, 2021 8:24:24 GMT -8
I will probably miss this one as I am going to be driving the Hana Highway. We are just about to get on a boat to dive Molokini.
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Post by scubalawyer on Sept 12, 2021 17:26:58 GMT -8
I will probably miss this one as I am going to be driving the Hana Highway Stop in at Palapala Ho'omau Church and say Hi to Lucky Lindy. He was still living near Hana when my dad and I did a beach dive in Hana around 1971. I recall a ton of Lamprey eels all over the rocks. They had these circular tooth-filled mouths that looked prehistoric and just plain nasty. Have a great trip!
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Post by vance on Sept 12, 2021 19:04:23 GMT -8
I won’t be diving near Hana as my companions are not divers. I got them to go to Molokini to snorkel, which was extremely good. The visibility was seemingly infinite and we saw tons of cool fish and turtles.
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Post by luis on Sept 13, 2021 17:21:25 GMT -8
I should be able to join.
Thanks
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Post by nikeajax on Sept 15, 2021 15:48:22 GMT -8
That was fun, thanks Jim! So, Stephan would like to start having meetings at 4:00 Pacific time...
JB
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Post by SeaRat on Sept 15, 2021 15:52:53 GMT -8
I was out picking up my wife from work. Again, sorry to miss it.
John
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Post by Jim Perdway on Sept 15, 2021 16:00:13 GMT -8
Yes thanks Jim- I like these meetings. I’m glad I was able to catch a bit of this one and chat. If pushing it back to 4 PST works okay for you guys that’d be great, no pressure though if it doesn’t. I today just started on a log home a half hour away so it’ll be long days this fall. I might still be a little late for them but not much.
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Post by luis on Sept 15, 2021 16:28:31 GMT -8
Yes, that was fun. Thanks again Jim. It was good seeing everyone again.
JB, here a diagram to the Deep Star II. As I mentioned, this is the only female piston regulator I know of. It is non-balanced and a flow through piston which is also not common, but there are a few other (not popular) flow through not-balanced piston regulators. It is something odd, with a story. I should have mentioned, it does have a very small volcano orifice (like most unbalanced first stages), so the IP probably fluctuated significantly (specially at depth), but I don't recall it being particularly bad. But I haven't work on one in over 45 years. And here are some pictures. For comparison, here is the Deep Star and below is the later Aquarius (from the 70's)
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Post by Jim Perdway on Sept 15, 2021 19:18:33 GMT -8
Towards the end of the convo, Jim had asked if modern regulators primarily are piston or diaphragm- I had actually been wondering the same thing. I think I heard on an Alec Peirce video a few years back that piston predominates these days, but Jim and JB were guessing diaphragm. What do you guys think?
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Post by james1979 on Sept 16, 2021 3:43:52 GMT -8
Sorry I missed it, guys. My job had me in the simulator all evening. If we do push the time back some in the future, I'll be more likely to make them, but it's really going to be hit or miss for me from here out.
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Post by luis on Sept 16, 2021 3:46:08 GMT -8
Towards the end of the convo, Jim had asked if modern regulators primarily are piston or diaphragm- I had actually been wondering the same thing. I think I heard on an Alec Peirce video a few years back that piston predominates these days, but Jim and JB were guessing diaphragm. What do you guys think? Scubapro and Atomic are still predominantly piston, but even Scubapro recognizes that tech divers prefer diaphragm. Aqualung and Apeks (which some say is by far the largest dive company) is mostly diaphragm first stages. All the new companies (that somewhat cater to tech divers) are mostly diaphragm: HOG/ EDGE, Deep 6, Dive Rite, Zeagle, etc. In general I would say it is roughly about 50%-50%, but diaphragm first stages may be gaining. At the end of the day, the second stage design is by far the most important when it comes to performance. The first stage all it has to do is provide a somewhat stable IP and if you have a good second stage, even a fluctuating IP doesn't matter that much. It is interesting how much attention the first stages get. I have taught a little class on "how regulators work" and I have always maid a point to always start with the second stages.
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Post by scubalawyer on Sept 16, 2021 7:11:35 GMT -8
Towards the end of the convo, Jim had asked if modern regulators primarily are piston or diaphragm- I had actually been wondering the same thing. I think I heard on an Alec Peirce video a few years back that piston predominates these days, but Jim and JB were guessing diaphragm. What do you guys think? Scubapro and Atomic are still predominantly piston, but even Scubapro recognizes that tech divers prefer diaphragm. Aqualung and Apeks (which some say is by far the largest dive company) is mostly diaphragm first stages. All the new companies (that somewhat cater to tech divers) are mostly diaphragm: HOG/ EDGE, Deep 6, Dive Rite, Zeagle, etc. In general I would say it is roughly about 50%-50%, but diaphragm first stages may be gaining. At the end of the day, the second stage design is by far the most important when it comes to performance. The first stage all it has to do is provide a somewhat stable IP and if you have a good second stage, even a fluctuating IP doesn't matter that much. It is interesting how much attention the first stages get. I have taught a little class on "how regulators work" and I have always maid a point to always start with the second stages. Agree with Luis, about 50/50 with diaphragm 1st stages having a slight lead. To show it is the 2nd stage that makes all the difference just look at the HPR replacing a regular AquaMaster 2nd Stage. Breathing is markedly improved. Great to see everyone yesterday. Sorry I had to duck out early. Gotta keep the client happy!
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Post by antique diver on Sept 16, 2021 14:12:39 GMT -8
If you have ever rolled around in the sand during a beach entry or exit (not admitting to that... just sayin') with a piston first stage, and had to clean the sand out of it, may account for my preference of diaphragm regs. Not to mention having to lay stage cylinders on silty cave floors from time to time.
I do like the simplicity of many piston regulators, I just have to treat them a little nicer.
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