[PSUBS-MAILIST] coupler design flaw

[Alan via Personal_Submersibles]

Hank,
I am not following you on that one, but I used a bike inner tube to try & 
compensate an AGM battery & filled it with baby oil. The oil degraded the
inner tube in relatively short time, so watch for that.
Alan

Sent from my iPad

> On 8/10/2014, at 11:34 pm, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> It seems my magnetic coupler has a design flaw.  When the drive assembly is installed in the sub, it is in the horizontal position creating an air pocket inside the barrier.  When I fill the shaft tube with oil, I can not remove this air pocket.  I can fill the assembly with oil before installation, but that is a pain if I loose some oil for whatever reason.  I have some options, first I have just installed a small bicycle inner tube to act as a compensation bladder inside the ballast tank.  My thinking is that it has enough volume of oil to offset the air pocket.  I can also replace the shaft bearings with a cutless type bushing, eliminating the need for oil.   The last solution is to fill the assembly with oil prior to installation and add a small oil reservoir above the assembly to insure there is always enough oil in case some escapes.
> Hank  
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