The Association of Model Submariners.

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* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



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For further details of any events shown here also see the "Shows and Events" section on the forum

*2021 AND SOME EVENTS ARE BEING PROPOSED. Keep them coming and let us know the details!

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(CANCELLED in 2020) Submarine, Boating & Sailing Weekend, Norwich MBC, Weekend of 25,26th July

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Bournville Sub Day. Sept 2021 is looking likely. More details TBA.

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Barrow in Furness Regatta and Sub day. Maybe in Sept 2021. Details TBA.

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The newest registered user is armchairsubguy

    bicycle CO2 inflation systems

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    SimonH

    Posts : 12
    Join date : 2020-09-29
    Location : Nottingham, UK

    bicycle CO2 inflation systems Empty bicycle CO2 inflation systems

    Post  SimonH Thu Oct 01, 2020 10:17 pm

    Has anybody tried using bicyle CO2 cylinders as a compressed gas source? From the various tables I've ssn about the I reckon the small CO2 cylinder has the equivalent of about 1.5 l (i.e. the volume of a fat bike tyre) at about 100 psi, so quite a lot of CO2 for about £1 each and about £20 for the adaptor. I think the big issue is that it would probably need a regulator to drop the pressure to a more more controllable value.

    As a second question I am thinking about using a peristaltic/tube pump to provide a trim function, as both models I am think about (Seehund or X-class) only have a rear p[lane so getting the trim right seems important. I was planning to have 2 small trim tanks at the extreme ends of the boat, but they could be sealed or at ambient pressure (diaghram?) by linking via a tube to allow the air to flow from tank to tank as well as the water.

    david f likes this post

    Deep Diver (Fred)
    Deep Diver (Fred)
    AMS member

    Posts : 261
    Join date : 2010-11-07
    Age : 72
    Location : Peacehaven East Sussex

    bicycle CO2 inflation systems Empty CO2

    Post  Deep Diver (Fred) Sun Oct 04, 2020 2:31 pm

    We did have a member that used Freon gas in his sub's, and that worked well, he also tried using a Sodastream gas bottle but that did not work out to well.

    Fred

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    salmon
    salmon
    AMS Forum Owner

    Posts : 300
    Join date : 2011-09-02
    Age : 61
    Location : Las Vegas, Nevada - USA

    bicycle CO2 inflation systems Empty Re: bicycle CO2 inflation systems

    Post  salmon Mon Oct 05, 2020 10:54 pm

    CO2 was done a lot in the mid to late 80's, however the issue with CO2 is the +850 psi it is stored at. There were issues to say the least, but there were many successful subs using it. Freon use was changed to compressed air (not actually air) but it is stored at ~75 psi. This gas system is still used today.

    So, can you do it. Absolutely, but you are dealing with a lot of pressure and bad things can happen.


    _________________
    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

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    tsenecal
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    Posts : 147
    Join date : 2015-04-01

    bicycle CO2 inflation systems Empty Re: bicycle CO2 inflation systems

    Post  tsenecal Tue Oct 06, 2020 4:15 pm

    a lot of model subs use a single peristaltic pump for their single ballast bag.

    i have two.

    one is Norbert Bruggen's Delta,
    the other is a moebius models skipjack converted to r/c with parts that originally came from a thundertiger neptune.

    the peristaltic pump systems both work well, but are slower than airpump or freon based systems


    as to the rest of the system you describe...  take this as constructive criticism... it sounds terribly complicated, i personally believe in the K.I.S.S. principle.

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    salmon
    salmon
    AMS Forum Owner

    Posts : 300
    Join date : 2011-09-02
    Age : 61
    Location : Las Vegas, Nevada - USA

    bicycle CO2 inflation systems Empty Re: bicycle CO2 inflation systems

    Post  salmon Wed Oct 07, 2020 1:15 am

    I met Tim several years ago and will tell you he is brilliant. He can build the most complicated submarine if he wanted. So, his advice to keep it simple is real wisdom. Do not complicate your build. I was taught crawl, walk, run - so same principle. Begin simple and as you gain real knowledge increase what you do to your sub.


    _________________
    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

    david f likes this post


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