* 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

Thanks for notification of events and keep 'em coming!

.

,
Bournville June 2nd 2019, 10am
.

. ,

Norwich MBC Submariners joint Model Boat weekend - 27/28th July

Grantham MBC, SUN, AUG 11 AT 10 AM
.
.Model Boat Convention (Exhibition), 24,25 August

.

. Bournville Dive-In (2) MBC, 15th September

,,,,

Barrow in Furness MBC regatta and submarine event, Sunday 22nd Sept 2019,10am

Who is online?

In total there are 2 users online :: 0 Registered, 0 Hidden and 2 Guests :: 1 Bot

None


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

Latest topics

» Assembling the excellent Scale Shipyards 1/96 SSBN, USS Daniel Webster
Bladders & Bags EmptyToday at 1:16 am by merriman

» Pinger 3 - Distance measurement (Triangulation, Transponders and Clocks on Board)
Bladders & Bags EmptyYesterday at 2:52 pm by david f

» Eden Dynamic WTC
Bladders & Bags EmptyFri Apr 19, 2019 3:20 pm by Deepdive

» John Lambert Plans
Bladders & Bags EmptyMon Apr 15, 2019 2:27 pm by david f

» Telemetry on openLRS
Bladders & Bags EmptyMon Apr 15, 2019 2:23 pm by david f

» Assisting with a 1/96 NOVEMBER class kit
Bladders & Bags EmptyWed Apr 03, 2019 12:36 pm by merriman

» trimming 1/96 USS ALBACORE
Bladders & Bags EmptySat Mar 23, 2019 12:37 am by merriman

» Arduino proportional control of a piston tank
Bladders & Bags EmptyFri Mar 22, 2019 2:37 pm by tsenecal

» Piston Ballast Systems
Bladders & Bags EmptyWed Mar 20, 2019 12:16 am by merriman

Statistics

Our users have posted a total of 10825 messages in 1774 subjects

We have 803 registered users

The newest registered user is yangshexiang

    Bladders & Bags

    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 2996
    Join date : 2010-11-05
    Age : 59
    Location : Nevada, USA

    Bladders & Bags Empty 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?


    Bladders & Bags Dsci0052
    avatar
    Guest
    Guest

    Bladders & Bags Empty 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
    david f
    david f
    AMS Treasurer

    Posts : 2028
    Join date : 2010-11-10
    Age : 68
    Location : Cumbria

    Bladders & Bags Empty 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.
    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 2996
    Join date : 2010-11-05
    Age : 59
    Location : Nevada, USA

    Bladders & Bags Empty 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!
    avatar
    wpitcairn

    Posts : 3
    Join date : 2017-10-25

    Bladders & Bags Empty 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
    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 2996
    Join date : 2010-11-05
    Age : 59
    Location : Nevada, USA

    Bladders & Bags Empty 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
    david f
    david f
    AMS Treasurer

    Posts : 2028
    Join date : 2010-11-10
    Age : 68
    Location : Cumbria

    Bladders & Bags Empty 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.

    Bladders & Bags S-l16010

    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
    avatar
    tsenecal
    Guest

    Posts : 119
    Join date : 2015-04-01

    Bladders & Bags Empty 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.

      Current date/time is Wed Apr 24, 2019 5:37 pm