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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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    The workings of a sheer line submarine

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    Michaelc

    Posts : 20
    Join date : 2021-04-22

    The workings of a sheer line submarine  Empty The workings of a sheer line submarine

    Post  Michaelc Tue Jun 08, 2021 6:12 pm

    Hi out there, I just purchased a sheerline akula that needs bit of tlc. The major problem is that if the dive pump is not running the sub will come to the surface. I have been informed that there is a valve operated by a servo that should close keeping the water in the dive tank, and then when the servo is powered the valve opens to allow the water out. Is this correct, and if so what’s the best way to adjust the valve. Thanks, Michael
    salmon
    salmon
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    The workings of a sheer line submarine  Empty Re: The workings of a sheer line submarine

    Post  salmon Wed Jun 09, 2021 5:31 pm

    Does your pinch valve look like this?
    The workings of a sheer line submarine  Sdc10724


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    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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    Michaelc

    Posts : 20
    Join date : 2021-04-22

    The workings of a sheer line submarine  Empty Yes

    Post  Michaelc Wed Jun 09, 2021 5:55 pm

    Hi, yes it does. What do I need to do too check and adjust the valve. Michael
    salmon
    salmon
    AMS Forum Owner

    Posts : 312
    Join date : 2011-09-02
    Age : 61
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    The workings of a sheer line submarine  Empty Re: The workings of a sheer line submarine

    Post  salmon Thu Jun 10, 2021 5:13 pm

    There are several thoughts.

    1. is the hose being pinched old? Possibly has a crack or hole in it? I would recommend replacing it. Air getting past the pinch valve (if it is working) suggests air is getting in maybe somewhere else (or under the point of compression on the hose).
    2. the pinching of the hose is a simple task, is the hunger pushing the hose closed completely? Maybe see if you can suck or blow air through the hose?
    3. If not, make or get the servo horn larger to push the plunger down more on the hose or move the valve closer to the servo.
    4. Is the servo still strong enough to maintain the pressure to keep the hose closed.

    Hope this helps.
    Peace,
    Tom


    _________________
    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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    Michaelc

    Posts : 20
    Join date : 2021-04-22

    The workings of a sheer line submarine  Empty Thanks

    Post  Michaelc Thu Jun 10, 2021 9:14 pm

    Thanks. I will have a look tomorrow
    salmon
    salmon
    AMS Forum Owner

    Posts : 312
    Join date : 2011-09-02
    Age : 61
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    The workings of a sheer line submarine  Empty Re: The workings of a sheer line submarine

    Post  salmon Mon Jun 14, 2021 4:22 pm

    Any success on finding the issue?


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    Michaelc

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    The workings of a sheer line submarine  Empty I think I have sorted it

    Post  Michaelc Mon Jun 14, 2021 5:53 pm

    Hi, I think I have sorted the problem. It looked like the servo setting for the pinch switch was wrong. The WTC is still apart, so I have not tested it in the water yet, but it looks ok now. Thanks for showing interest.

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