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Porpoise CA-1 regulator

Discussion in 'Vintage Equipment Diving' started by Fibonacci, Jan 14, 2019.

  1. happy-diver

    happy-diver Skindiver Just feelin it ScubaBoard Sponsor

    # of Dives: 100 - 199
    Location: same ocean as you
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    I've never paid attention to this type of computer stuff

    I can feel those parts between my fingers, a bit cool in Melbourne at the moment
     
    Fibonacci likes this.
  2. JMBL

    JMBL Solo Diver

    # of Dives: 500 - 999
    Location: France
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    Very impressive restoration, bravo !
     
    Fibonacci likes this.
  3. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
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    The Devil is always in the details... :wink:

    Does anyone know of a source for the chromed brass adjustable buckles on the safety strap?
    If we go to the trouble of getting new safety straps made up, it would be good to also have period correct new buckles!
    I'd say they were a common item for a range of dive gear, measuring 1" to the outside to suit a 5/8" strap, wire dia 3/16".
    Porpoise safety strap buckle.jpeg
     
    Sam Miller III likes this.
  4. happy-diver

    happy-diver Skindiver Just feelin it ScubaBoard Sponsor

    # of Dives: 100 - 199
    Location: same ocean as you
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    Okay a quick start sample idea
    elcheapo buckles for plating

    Solar Plating
    is where I used to get all my regs and other fine stuff rechromed
    perfect work No 1 beautiful, I think it was John, but 15 years ago
    The dive gear manufacturers used to use him.

    I'll scratch up some photos

    I haven't found any bloody stainless ones yet

    What's a bit of rust among friends ha ha ha ha ha ha ha
     
  5. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    573
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    63
    Thanks for the links and tip, been trying to find a place that will do 'odd' rechrome jobs like vintage restorations without charging an arm-and-leg!
    Recut the threads on both the diaphragm plate and the nut... originally staked together with a heavy hand, very difficult to unscrew even with the staked areas drilled out, but finally done!

    Diaphragm nut thread recutting.jpeg

    Diaphragm plate thread recutting.jpeg
     
    Sam Miller III likes this.
  6. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    573
    473
    63
    Having now reverse engineered the Porpoise CA-1 I can say Ted Eldred was W-A-Y ahead of his time... a truly visionary SCUBA design pioneer :cool:

    Porpoise First Stage.PNG Porpoise First Stage Sectioned in Y.PNG Porpoise First Stage Sectioned in Z.PNG
     
  7. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    573
    473
    63
    Porpoise First Stage Exploded 2.png
     
  8. happy-diver

    happy-diver Skindiver Just feelin it ScubaBoard Sponsor

    # of Dives: 100 - 199
    Location: same ocean as you
    1,133
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    Look at those computer photograph things wow!!!


    A perspective, whilst the idea of Porpoise first stages may have come from OxyAcetylene welding regulators, one must understand that despite the regs being the same, the oxy has a right hand thread and the acetylene a left


    The Porpoise has the identical sized fitting used for medical oxygen for many decades
    until the relatively recent switch to pin index for big bottles currently as well as small


    So the Porpoise fitting is a medical oxygen bullnose fitting
    that is also used for welding oxygen

    So which came first, breathing o2 or welding and cutting with it, or fueling rockets ha ha ha or the egg


    full.jpg

    so metal to metal or plastics to metal, O rings to metal, or other rubberised, plasticised compounds stuff


    Now I can't remember why I included all these in the photo however but
    the 109 my first, I panel beated and had rechromed by John.

    Immaculate


    and there's the Porpoise WRENCH for wrenching, the original fittings are metal to metal

    full.jpg

    now the Porpoise has also been braze repaired and lathed down to size
    panel beaten, filed sanded and immaculately chromed however I was
    going through an I don't want it shiny period 15 yrs ago so I beat it up
    somehow and dulled it a bit and the weather has completed my task.

    I suppose I wanted it looking old, out from under the house original

    the dull polishes off, I wish I remember how I did it

    I suppose it's very lightly evenly verdigrissed
    a very fine scourer to dull the chrome, some vinegar and a humid environment
     
  9. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    573
    473
    63
    Nice collection... I see a Porpoise Universal lurking in there :D
     
  10. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    573
    473
    63
    Wait, there's more :D

    Porpoise CA-1 Second Stage Sectioned 2.png

    Still have to model the exhaust valves, the originals had a surprisingly complex surface which needs to be simplified for modern reproduction.
    And what to do about retention ties?
    The originals were just copper wire twisted together and painted black after installation... cable ties hadn't been invented yet!
     

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