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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Sub Weekend, Sheringham, North Norfolk, Sat/Sun 30,31 July 2022

Bournville Dive-In, Birmingham, Sunday 4th Sept 2022

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Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

» Simple telemetry system for openLRS (on 458Mhz)
bicycle CO2 inflation systems EmptyMon Jun 20, 2022 4:15 pm by geofrancis

» My collection of fibreglass moulds.
bicycle CO2 inflation systems EmptyFri Jun 10, 2022 3:23 pm by tsenecal

»  Submarine weekend, Sheringham, Norfolk,30th and 31st of July 2022
bicycle CO2 inflation systems EmptyFri May 27, 2022 3:22 pm by david f

» WW2 mini sub build
bicycle CO2 inflation systems EmptySun May 22, 2022 10:43 pm by SimonH

» Papplewick Pumping Station 2022
bicycle CO2 inflation systems EmptySat May 21, 2022 9:39 am by david f

» Akula 1/144 scratch build
bicycle CO2 inflation systems EmptyThu May 19, 2022 7:51 am by redboat219

» Darnell U class wanted
bicycle CO2 inflation systems EmptySat May 14, 2022 8:19 am by david f

» New modeller looking for U-Class to build
bicycle CO2 inflation systems EmptyFri May 13, 2022 3:35 pm by Paul Reilly

» K class plans
bicycle CO2 inflation systems EmptyFri May 13, 2022 10:18 am by david f

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4 posters

    bicycle CO2 inflation systems

    avatar
    SimonH


    Posts : 57
    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 : 263
    Join date : 2010-11-07
    Age : 73
    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 : 312
    Join date : 2011-09-02
    Age : 62
    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
    Guest


    Posts : 183
    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.

    david f likes this post

    salmon
    salmon
    AMS Forum Owner


    Posts : 312
    Join date : 2011-09-02
    Age : 62
    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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