Mistral rebuild clarification question.

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herman

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Don't know if you have dove these regs before but if not, be aware they are prone to squeal when you breath at higher tank pressures. Not all do but it's not uncommon. We have used them up to 3k but they work a lot better once you get below 2k or so.
 
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Ghost95

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Thanks Herman, I look forward to hearing it. This reg will mostly be used on steel 72's that may get pumped to 2800.

Another question, do any of the tools i got from you to hold and work on the DAAM's work for this reg? Thanks
 

John C. Ratliff

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I will not use my Mistral on any tank above 2475 psi. If you look at the seat, it is a piece of metal (brass) with a circle drilled out and filled with a plastic material that forms the seat. Imbedded into this plastic is a piece of metal that the pin pushes against. On at least some of these there is no metal beneath the pin's metal disc in the center. I destroyed one seat by mounting it onto a AL 80 at 3000 psi, as that metal disc was pushed into the plastic and to the side, causing a very loud and bad free flow. So I simply don't do that now.

Something people don't realize is that the Mistral had U.S. Navy Experimental Diving Unit (Navy EDU) approval for use with the Navy. The breathing curve of the Mistral was actually better on inhalation than the more expensive DA Aquamaster. The breathing curve became almost effortless at depth.

The U.S. Air Force Pararescue local purchased Mistral regulators for use with their parascuba jumps for NASA. You can see the configuration in the below photo with the parascuba in the upper right photo (the one with the parachute "sticking out" making exit from the aircraft harder).

Now, the other thing is that with any double hose regulator, you want to mount it on the tank and wear it very low on your back, between the shoulder blades. Why? Because there is a potentially high "head" of water between the regulator and the center of the lungs if the regulator is mounted high above the back. Bill Barada explained this in the below diagram in his book, Let's Go Diving, produced by U.S. Divers Company.
 

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Ghost95

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Thanks for the info John. I have been working with my DAAMs on tank positioning. I'm using a copy of the VDH plate, sometimes with a VDH wing, sometimes with no buoyancy device. It's been a fun experience. Looking forward to getting the Mistral done and experiencing easy breathing everyone talks about.

I'll keep the tanks for the Mistral lower than the 2800 to preserve the seats I guess. They're hard to find. I wish I could find new made replacements for those and the DAAM. I don't have a Royal Aquamaster yet but when i find one for a good price I'll sell one of the rebuilt DAAMs and rebuild a Royal.

Have a good day.
 
https://www.shearwater.com/products/perdix-ai/

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