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    type ix c [u505 late]

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    willte
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    Posts : 117
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    Age : 65
    Location : lossiemouth morayshire

    Re: type ix c [u505 late]

    Post  willte on Thu Oct 30, 2014 7:44 pm

    ojays wrote:Watching this closely, are there any updates please!

    Gregg


    wee bit of a disaster when trying the water tight compartment in the bath it dived when I filled the water bag but I notice air coming from one of the control rod outlet so took it out and fixed it tried it again the pressure built up inside when I filled the bag with water and blow the end cap off I decided to fix it with screws through the side between the two o rings and still blown off need to find a way to reduce the pressure in side the tube thinking of fitting a valve to relieve some of the pressure be trying again after new year that's if it floats with a bit of vacuum ? or long bolts throuhg the tube

    ojays
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    Re: type ix c [u505 late]

    Post  ojays on Thu Oct 30, 2014 8:35 pm

    willte wrote:
    ojays wrote:Watching this closely, are there any updates please!

    Gregg
       

    wee bit of a disaster when trying the water tight compartment in the bath it dived when I filled the water bag but I notice air  coming from one of the control rod outlet so took it out and fixed it tried it again the pressure built up inside when I filled the bag with water and blow the end cap off I decided to fix it with screws through the side between the two o rings and still blown off need to find a way to reduce the pressure in side the tube thinking of fitting a valve  to relieve  some of the pressure be trying again after new year that's if it floats with a bit of vacuum ? or long bolts throuhg the tube

    I'm still a beginner at this, however I have seen a number of WTC's with threaded rod, running from one end of the cylinder to the other.
    Just an idea.
    Gregg
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    david f
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    Age : 67
    Location : Cumbria

    Re: type ix c [u505 late]

    Post  david f on Fri Oct 31, 2014 12:11 pm

    Welcome back Willte!

    Raising the WTC pressure is always going to be a problem where something expands into the WTC space (Bags, piston tanks etc) Pressure tanks don't have this problem.

    All you can do in practice, is allow sufficent volume in the WTC and give it enough strength to cope with the pressure rise or limit the size of the bag.

    Putting vent valves in?
    - More holes to leak
    - More complexity
    - You end up with a partial vacuum in the WTC

    Why is design always a compromise?

    David

    willte
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    Re: type ix c [u505 late]

    Post  willte on Fri Oct 31, 2014 7:01 pm

    cheers DAVID
                       the trouble is space the bag may be  a big but it nearly full to go right under trying to work it out but to me this is part of the fun[enjoyment]but if it worked first time you will get board and try some thing else it may sound daft but that's me


    saying in a shipyard I worked in was ---if its done  wrong the first time do the same again a second time to prove the first time was wrong
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    david f
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    Re: type ix c [u505 late]

    Post  david f on Sat Nov 01, 2014 2:25 pm

    I think you may have to compromise on the waterline or the bag size to avoid the WTC getting overpressured.

    You could try to minimise the displacement (volume) of the superstructure.

    And/or you could fit a smaller bag or use the John W restricted bag method (a toilet roll.)

    David

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