* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



Join the AMS - Registered Forum users can become members of the AMS and it's free ...... To join register on the forum first then follow the forum link to our membership form which is on our website


For further details of any events shown here also see the "Shows and Events" section on the forum

Let us know of your plans for 2018 and we will promote them on this Forum

.

,
.
.

. ,

,

.
.
.

.

.

,,,,

.Barrow in Furness MBC, Sub Day and Regatta,Sunday 23rd September 2018. (DATE CHANGE!)

Who is online?

In total there are 4 users online :: 0 Registered, 0 Hidden and 4 Guests :: 2 Bots

None


Most users ever online was 37 on Sun Mar 13, 2011 11:27 am

Latest topics

» building a 1/96 THRESHER r/c submarine
Today at 10:03 am by david f

» Operating torpedoes..
Fri Sep 21, 2018 12:46 am by merriman

» 3d printed Alfa Class Russian Submarine
Thu Sep 20, 2018 9:47 am by david f

» The Model Show - indoor swimming pool sailing - Poynton,Stockport 15,16th September 2018
Thu Sep 20, 2018 9:42 am by david f

» 433/458 Mhz openLRS in a swimming pool.
Tue Sep 18, 2018 4:56 pm by david f

» Arduino proportional control of a piston tank
Tue Sep 18, 2018 3:23 pm by tsenecal

» Making end caps
Tue Sep 18, 2018 10:17 am by SWEnick

» Poynton Model Show 2018
Mon Sep 17, 2018 6:20 pm by david f

» Hi from Sweden!
Mon Sep 17, 2018 1:45 pm by SWEnick

Statistics

Our users have posted a total of 10644 messages in 1746 subjects

We have 785 registered users

The newest registered user is Glenn69


    Bladders & Bags

    Share

    Tom(ADMIN)
    AMS Forum Owner

    Posts : 2993
    Join date : 2010-11-05
    Age : 58
    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?



    Guest
    Guest

    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
    avatar
    david f
    AMS Treasurer

    Posts : 1984
    Join date : 2010-11-10
    Age : 68
    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

    Posts : 2993
    Join date : 2010-11-05
    Age : 58
    Location : Nevada, USA

    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

    Posts : 2993
    Join date : 2010-11-05
    Age : 58
    Location : Nevada, USA

    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
    avatar
    david f
    AMS Treasurer

    Posts : 1984
    Join date : 2010-11-10
    Age : 68
    Location : Cumbria

    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

    tsenecal
    Guest

    Posts : 102
    Join date : 2015-04-01

    Re: Bladders & Bags

    Post  tsenecal on Mon Nov 20, 2017 4:14 pm

    actually, for the two bladder based systems that i have, one is just a large (24" diameter) thick walled party balloon. the other one (norbert bruggen delta) uses sheet vinyl glued with thick rubberized CA.

    Sponsored content

    Re: Bladders & Bags

    Post  Sponsored content


      Current date/time is Tue Sep 25, 2018 10:33 am