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    Bladders & Bags

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    Tom(ADMIN)
    AMS Forum Owner

    Posts : 2991
    Join date : 2010-11-05
    Age : 57
    Location : Nevada, USA

    Bladders & Bags

    Post  Tom(ADMIN) on Mon Feb 21, 2011 1:26 pm

    My friendly and tame chemist lady gave me this saline bag just now, and I'm hoping to be able to use it as a water ballast bag in Project 575.

    The bag holds over 2000ml of liquid, and I'm thinking it's a bit too big, so the question is : can I cut it down and reglue it somehow? If so, with what do I glue it with?

    Or would it be safe to use if I just fold up the end and tape it over? It will positioned on a styrene tray above the radio gear in the watertight box, so I definitely do not need it to leak!

    Any ideas forthcoming, chaps?



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    Re: Bladders & Bags

    Post  Guest on Mon Feb 21, 2011 2:44 pm

    .


    Last edited by Poolruns on Sat Feb 26, 2011 6:04 pm; edited 1 time in total
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    david f
    AMS Treasurer

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    Age : 67
    Location : Cumbria

    Re: Bladders & Bags

    Post  david f on Tue Feb 22, 2011 12:53 pm

    I saw some clever use of layflat tubing up at the Edinburgh Model Boat Club. I think it was George. PM me Richard if you want to follow it up.

    Tom(ADMIN)
    AMS Forum Owner

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    Join date : 2010-11-05
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    Re: Bladders & Bags

    Post  Tom(ADMIN) on Tue Feb 22, 2011 5:15 pm

    david forrest wrote:I saw some clever use of layflat tubing up at the Edinburgh Model Boat Club. I think it was George. PM me Richard if you want to follow it up.

    David, I think the problem is solved, thanks to to Nigel...I followed his instructions to the letter, and when I tested the bag in a cylinder in the bath it worked perfectly (yes, I was surprised too!)

    Many thanks for the offer, if it fails I'll be in touch post haste!

    wpitcairn

    Posts : 3
    Join date : 2017-10-25

    Re: Bladders & Bags

    Post  wpitcairn on Tue Nov 07, 2017 5:06 pm

    Any chance of the solution details as I'm looking to get my darnell u570 diving again. It's currently just setup for surface running and I have a couple of empty compartments?

    Regards Will

    Tom(ADMIN)
    AMS Forum Owner

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    Join date : 2010-11-05
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    Re: Bladders & Bags

    Post  Tom(ADMIN) on Thu Nov 09, 2017 12:25 am

    My name is now on all the old Owners posts, so it is easy to think I made the post. I did not. Maybe Nigel can jump in here and remember what he recommended to get the dive system working.
    There are many ways to get your sub to work. A bladder system is certainly one way.
    Peace,
    Tom
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    david f
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    Re: Bladders & Bags

    Post  david f on Sat Nov 11, 2017 9:36 am

    I have just spoken with Nigel on the phone and he said the conversation was some time ago but basically he recommended:

    - Rolling the bags up and putting them inside a plastic tube with perforated end caps.

    - He found that saline bags etc seem to be rather too large for use in models and so water "sloshes" around in them disturbing your trim.

    - Enclosing them restricts the movement of the bag, reduces the volume and helps to prevent the bag bursting if it gets pressurised.

    I have also been searching the old grey cells for my comments on lay flat tubing. I have looked at photos of Edinburgh but I didn't take any of these tubes.

    The sort of tubing is shown below. Available on ebay and can stand 4 Bars pressure.



    Easy to cut to length and lies neatly inside a hull. I can't remember how to seal the ends but I would suggest plastic end caps inserted and glued in the tube?? Perhaps with a Jubilee clip around it?? (Other clips are available!)

    I need to qualify my statements by saying I have never used bladders (perhaps because of availability) I have only used PVC/ fibreglass pumped pressure tanks and (now) home made piston tanks.

    David

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