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Post by antique diver on Nov 11, 2022 9:45:28 GMT -8
To make the venturi effect adjustable I made a modified nozzle with a threaded collar that can be turned to adjust the airflow volume into the can. Less to the can sends more down the inner hose. Once adjusted it must be secured with medium Loctite. I may try a small setscrew to secure the collar next time I open it up.
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Post by vance on Nov 11, 2022 12:57:38 GMT -8
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Post by james1979 on Nov 11, 2022 13:34:21 GMT -8
I printed a set of these to send to Bill for testing: Left hand is exhaust with a small lip for centering on the mouthpiece. Right hand is intake, planned to rely on Bill's method of punching the center out of a standard mushroom and trapping it between the wagon wheel and a bushing on the hose barb. If I get the length of the bushing, I can print those too for anyone that wants to try it but doesn't want to make a bushing. Respectfully, James
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Post by antique diver on Nov 11, 2022 13:51:16 GMT -8
I printed a set of these to send to Bill for testing: Left hand is exhaust with a small lip for centering on the mouthpiece. Right hand is intake, planned to rely on Bill's method of punching the center out of a standard mushroom and trapping it between the wagon wheel and a bushing on the hose barb. If I get the length of the bushing, I can print those too for anyone that wants to try it but doesn't want to make a bushing. Respectfully, James Looking great James! Thanks for taking an interest in this, as there may be others needing parts like these. When I get back into mine to test your new models I will get the dimensions or make an extra bushing to send to you. I made it from brass, but it doesn't need the strength of metal so there is no reason that it couldn't be printed or otherwise made from plastic or delrin.
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Post by antique diver on Nov 16, 2022 18:12:56 GMT -8
James made these prototype retainers for the mouthpiece valves. The exhaling side on the left has a ridge to fit slightly into the left side of mouthpiece tee and keep it centered. Right side sits entirely on the outside of the tee, and is held in place by the hose like my original version. We may find that it could also work with the ridge like left one has. Looks to me like they should work well. I'll give them a try and report back. Thanks James! BT
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Post by vance on Nov 17, 2022 8:37:55 GMT -8
If you have several, can you send me one for measurements and I'll send it back with wagon wheels? I was wondering why you prefer to keep only the exhaust non-return valve (I'll abbreviate to "NRV"). Not arguing the point, just wanting some education on the subject.
Some regulators definitely inhale a bit easier without the incoming non-return valve, but I was interested in keeping water from the cans to make clearing water from flooded regulator and hoses easier. With air retained in the incoming hose and regulator cavity it is easy to blow the mouthpiece and exhaling hose clear by just turning into a position that places the regulator deeper than the mouthpiece. That should quickly cause the regulator to do the work of blowing water from the hoses with less physical maneuvering than old methods of hose clearing without mouthpiece NRV's. I haven't installed an exhaling side NRV due to the small size and resulting exhaling resistance. The inhaling resistance of this particular regulator is so low that the incoming NRV is not an issue. It remains to be seen how this works out during actual dives.
I look forward to hearing comments on the subject!Sorry. My mistake. I meant an intake NRV.
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Post by SeaRat on Dec 28, 2023 19:13:08 GMT -8
I've had a couple of stock O-Ps. The hose in hose concept seems to work well, but I don't like the GUSH of air into your gob. It's similar to the MR-12 with the tube on the second stage. It makes me anxious. It might just take getting used to. However I prefer a modulated venturi that provides what you need when you want it, regulated by how hard you pull. I just looked at my Overpressure Breathing Regulator's mouthpiece, and the metal tube that attaches to the inner hose. That metal tube has three smaller holes drilled in it which focuses the incoming air into the diver's mouth. The objections about the "gush" could be because this regulator has only these three holes. That creates a mist if there is any water in it, and also in very cold water apparently it creates ice crystals coming into the mouth. I'm wondering whether it would have been bettor to has a slot, like on the Scubapro 109 second stage, instead of the three holes? Nobody seems to object to the Scubapro regulator, even though it is also pointed directly down the divers mouth. John
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Post by SeaRat on Jan 3, 2024 18:22:27 GMT -8
Also, as you can see below, I've taken the best of the Mistral, and installed it on my Overpressure Breathing regulator. That includes a long yoke, with the ability to use a banjo/SPG with this regulator, as well as a band rather than the normal clips for the boxes. The original duckbill configuration was retained, as I deem it superior to the duckbill within the horn as it can easily be removed for cleaning. IMG_1181 by John Ratliff, on Flickr John
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Post by antique diver on Jan 3, 2024 21:18:03 GMT -8
Also, as you can see below, I've taken the best of the Mistral, and installed it on my Overpressure Breathing regulator. That includes a long yoke, with the ability to use a banjo/SPG with this regulator, as well as a band rather than the normal clips for the boxes. The original duckbill configuration was retained, as I deem it superior to the duckbill within the horn as it can easily be removed for cleaning. IMG_1181 by John Ratliff, on Flickr John Me too on the duckbill installation and the band clamp.
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