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.