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Bagpumper - to seal or not?

R/C Submarine modelers

Bagpumper - to seal or not?

Postby subkraft » Wed Aug 12, 2009 2:10 am


This is a pic of my nearly complete slightly modified Arkmodel Song wtc:


The reversing pump simply pumps water in and out of the bag thru the solenoid valve. The bag is suspended in a tube within a tube. The manufacturer shows this inner tube well sealed up around all joints.

I like to be able to take things it important that the tube within the tube be airtight? The only advantage I can see that it would contain the change in internal pressure as the bag inflates...

Any bits of wisdom appreciated.

Model is getting closer to finished:

“The difference between genius and stupidity is that genius has its limits.” ~ Albert Einstein.
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Postby Bigdave » Wed Aug 12, 2009 8:13 am

Depending on the pressure that is developed it could play havoc on your output seals. :cry:
I have seen that type of seal blow up like a balloon from too much pressure inside. :shock:
Maybe that is why they do it.
Give it a try on the bench and see. You can always goop it up after.
Or just ask Arkmodel. :D BD.
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