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Post by artc on Jun 7, 2024 11:22:09 GMT -8
Sure, that would also be true to OEM. I have an original barb fitting with the ferrule still on it, if anyone's interested. I also have a couple of repro Mistral fittings that could be modified into a barb. The side holes are a problem, but could be filled with JBWeld. Hi Phil, I’m interested in the original Barb with the ferrule still on it if you’re willing to part with it. I’ll try to recreate an OEM hose based on my previous post. I’ll document the step by step process and post photos on the forum. Let me know, thanks.
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Post by artc on Jun 7, 2024 11:25:08 GMT -8
I had forgotten that the center hole in the mouthpiece tube goes through. This would indicate to me that the holes are calibrated as well, and cutting a slot would not work. Looks like we can eliminate the Mistral nozzle idea.
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Post by vance on Jun 7, 2024 14:03:38 GMT -8
I had forgotten that the center hole in the mouthpiece tube goes through. This would indicate to me that the holes are calibrated as well, and cutting a slot would not work. Looks like we can eliminate the Mistral nozzle idea. No, I don't think so. Plugging the side holes and making sure the nozzle jet is the correct size should work. However, I'll send you the O-P nozzle.
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Post by artc on Jun 7, 2024 14:29:11 GMT -8
Looks like we can eliminate the Mistral nozzle idea. No, I don't think so. Plugging the side holes and making sure the nozzle jet is the correct size should work. However, I'll send you the O-P nozzle. Thanks Phil. I’ll post my progress on the forum.
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Post by vance on Jun 7, 2024 14:44:21 GMT -8
It's on the way!
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Post by SeaRat on Jun 7, 2024 15:49:14 GMT -8
I'll have to look, but I don't remember the middle hole being all the way through the tube. At this point, I still think a slot would have been a better solution, and it could be based upon the Scubapro 109 slot.
John
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Post by vance on Jun 7, 2024 15:58:34 GMT -8
John, Check out the photo above. You can see that the middle hole goes through, b/c of the light showing through. This would not have been done w/o a reason. I think it is part of the overall calibration, but it might not be critical. You've been talking about a hose-in-hose experiment for a long time, and I've been resisting for as long. My interest is being piqued, and I'm thinking my HomeDepot mouthpiece design might be a good platform for this. Problem is, I don't have a Mistral valve to work with.
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Post by artc on Jun 7, 2024 22:12:26 GMT -8
I found this on YouTube. It appears that in the video the hose is newly fabricated and resembles the OEM one. I wonder if it was made by a hydraulic hose company? youtu.be/XC8Z3FIhQxk?si=upgHvP4DkTdRQ1wG
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Post by jeffinmichigan on Jun 9, 2024 23:19:56 GMT -8
I would be inclined to believe that Bryan of VDH put that video together with original parts. If you look closely the bite mouthpiece was correct as well as the diaphragm. I watched that same video more than a few times...
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Post by spirou on Jun 10, 2024 7:17:04 GMT -8
I would be inclined to believe that Bryan of VDH put that video together with original parts. If you look closely the bite mouthpiece was correct as well as the diaphragm. I watched that same video more than a few times... This video is not from Bryan, but a Frenchman, but his site doesn't exist more "vintagescubadiving.com". On his site there had lot's of photos and information on DH regulators , but his videos stays online on YouTube, but how long... I have had few contact with him , few years ago. But like my friend from Spirovintage, no more contact with him. Cheer's Fred
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Post by SeaRat on Jun 10, 2024 7:55:53 GMT -8
Well, I looked down the metal mouthpiece of my Overpressure Breathing regulator yesterday, and it does appear that the center hole is drilled completely through. That's interesting, and I wonder why it was done, as there is no documentation about that anywhere that I know of. Maybe it allows any water that enters the mouthpiece to dissipate out the back rather than down the diver's throat, or maybe there is a reason that the hole is all the way through for the Venturi effect. I don't know.
John
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Post by jeffinmichigan on Jun 10, 2024 8:17:33 GMT -8
SeaRat I've got a suspicion that it was there to help keep the backside of the pipette at a similar ambient/slightly positive pressure to avoid stalled flow or eddies during the flow cycle of an inhalation. Talking out my other end again: Jeff
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Post by SeaRat on Jun 10, 2024 11:44:43 GMT -8
Here's an interesting "What If?" What if they put the metal mouthpiece together, with the three holes drilled only on the mouthpiece side, and checked it out with a breathing test (either machine or diver), and they had a run-away Venturi event? As an engineer, what would be the best, most cost effective way of reducing this to a better stete? How about we try simply drilling the center hole all the way through? We'll test it, and see if it works. If it does, then we simply modify the manufacturing process to drill that center hole all the way through the tube. Problem solved!
John
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