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*2021 AND SOME EVENTS ARE BEING PROPOSED. Keep them coming and let us know the details! (amstreasure@googlemail.com)

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;:;


Model Sub Weekend, 28th, 29th August. Bluewater Parkway, Greenhithe, DA9 9

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

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

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Latest topics

» GRP end caps
type ix c [u505 late] - Page 3 EmptyTue Jul 20, 2021 9:31 am by david f

» WW2 mini sub build
type ix c [u505 late] - Page 3 EmptyTue Jul 20, 2021 9:15 am by david f

» Good 3D beginner's tutorial
type ix c [u505 late] - Page 3 EmptyFri Jul 16, 2021 3:14 pm by david f

» Looking for drawings and instructions for Hegi U-25 Kit
type ix c [u505 late] - Page 3 EmptyThu Jul 15, 2021 1:25 am by Telusboats

» Merit 1/35 X craft
type ix c [u505 late] - Page 3 EmptyTue Jul 13, 2021 3:54 am by tsenecal

» UHF radio control for submarines (openLRS, LoRa, FSK etc. on 458Mhz and 433Mhz )
type ix c [u505 late] - Page 3 EmptyMon Jul 05, 2021 10:43 am by david f

» The workings of a sheer line submarine
type ix c [u505 late] - Page 3 EmptyWed Jun 30, 2021 9:03 am by subkraft

» Bonjour from France.
type ix c [u505 late] - Page 3 EmptyMon Jun 28, 2021 1:43 pm by Tobyledog

» Underwater navigation using UHF ?
type ix c [u505 late] - Page 3 EmptyFri Jun 25, 2021 5:46 pm by SimonH

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    type ix c [u505 late]

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    willte
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    Post  willte 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
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    ojays
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    type ix c [u505 late] - Page 3 Empty Re: type ix c [u505 late]

    Post  ojays 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
    david f
    david f
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    type ix c [u505 late] - Page 3 Empty Re: type ix c [u505 late]

    Post  david f 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
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    Post  willte 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
    david f
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    type ix c [u505 late] - Page 3 Empty Re: type ix c [u505 late]

    Post  david f 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

      Current date/time is Mon Jul 26, 2021 2:04 pm