Numatics Poppet Valves

Discussion in 'Weapons & Pneumatics' started by Rhukatah, Sep 21, 2013.

  1. Rhukatah

    Rhukatah New Member

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    Has anyone ever tried to use a Numatics air actuated poppet valve to supply air to a manifold that fires multiple cannons?
    The 1/2" one seems like it would supply as much air as the buna ball valve in an Indiana cannon: http://www.airoil.com/v6/contents/en-us/p9169.html
     
  2. Tugboat

    Tugboat Facilitator RCWC Staff Admiral (Supporter)

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    I wish that they listed specs.
     
  3. Rhukatah

    Rhukatah New Member

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    Here is the spec sheet, specs for the one I'm looking at are on page 9:
    http://www.numatics.com/common/PDF/poppet.pdf
    If I'm reading it right, the 1/2" one is rated at 232 SCFM @ 80 PSIG. .007 seconds to open, .010 seconds to close.
     
  4. GregMcFadden

    GregMcFadden Facilitator RCWC Staff

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    Nope. I like the specs but not the size. they are not small: the solenoid one is roughly 3X3X6 and the air actuated one is roughly 3X3X4 inches.
     
  5. Rhukatah

    Rhukatah New Member

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    So it will move enough air, it just won't fit in a boat?
     
  6. GregMcFadden

    GregMcFadden Facilitator RCWC Staff

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    it might fit in a larger boat if you replaced the big gun accumulator with it... emphasis on might....
     
  7. Rhukatah

    Rhukatah New Member

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    I'm thinking more for age of sail..
    In theory, between being less pointy, being in a larger scale, setting all the guns in the widest part of the ship and not having to accomodate a drive system beyond a few servos belowdecks, larger AoS ships should have space to burn.
     
  8. Tugboat

    Tugboat Facilitator RCWC Staff Admiral (Supporter)

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    In that regard, a 3rd-rate like you're about to build (so jealous of the lasercut coolness), might indeed have room for it. Not sure on if it could move enough gas from the regulator to the cannons... would definitely want an accumulator.
     
  9. Rhukatah

    Rhukatah New Member

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    I only contracted a laser shop because I'm not good enough with a scroll saw to cut that many halved joints without many, many hours of frustration.

    From what I've read in Kotori's different threads on cannon theory, I'd need between 10.5 and 14 cubic inches worth of accumulator to power a bank of 7 BB guns. Eight inches of 1-1/2" pipe is almost exactly 14 cubic inches of space. Add on another two inches for fittings to adapt from 1-1/2" to 1/2", three inches for the valve another two inches for a manifold to distribute gas to the guns we're looking at 15 inches in total length.

    For the Ingermanland, my working space below decks between the fore and mizzen masts approximates an 8" cone 25" long. Even with the CO2 bottle and all the hoses and fittings, the entire CO2 delivery system will fit comfortably between the uprights for the fore and main masts.

    My main concerns are cost and reliability. A full set of Arizona guns for the Ingermanland would cost $600 (including the costs of the CO2 delivery system). Using a single accumulator for each battery along with this poppet valve and a manifold reduces the cost by 25% and will probably work more consistently than if I were to build an Indiana-style buna ball valve for the same setup.
     
  10. Kun2112

    Kun2112 Active Member

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    Something you might want to consider for AoS: Since the likely hood of firing port and starboard broadsides right after another is very low, if you go with a design that uses an accumulator, you could have a shared accumulator: a valve on one end fires port, and a valve on the other end fires starboard.
     
  11. Rhukatah

    Rhukatah New Member

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    If I get sandwiched between two other ships in a 4th-rate or larger ship, I don't want to have to chose which side of my boat is a harmless target.

    I can see a single accumulator setup for smaller ships though.
     
  12. Tugboat

    Tugboat Facilitator RCWC Staff Admiral (Supporter)

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    If it's one accumulator big enough to fire both sides, the many opportunities for firing to one side only will have more gas available, too...