[PSUBS-MAILIST] motor pod testing

[Rick Patton via Personal_Submersibles]

Seems like quite an expansion rate for the oil you used. I will be using
merical oil and am hoping for very little volume expansion so the bladder's
don't have to be that large.
Rick

On Mon, Apr 2, 2018 at 6:29 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Brian,
> you should get a lot more cooling in the water. When testing my lights,
> they
> heated to the point where you could only touch them for a few seconds
> after 5 minutes but stayed warm for an hour in water.
> You were testing with no load on the thruster. It will heat up quite a bit
> quicker with a load on.
> Cheers Alan
>
> Sent from my iPad
>
> On 3/04/2018, at 2:52 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All ,         Tested my motor pods today for about an hour at about 3/4
> maximum speed.   Had about 8 feet of 1/2" vinyl tubing coming from the top
> of the motors going straight up into the air and hanging from my overhead I
> beams.  Had the vinyl tubing connected to small inner tubes that had the
> air evacuated out of them.  It was a cool day ( overcast, 60 degrees) . I
> ran the motors for over an hour, by the end of the hour the wd40 had
> climbed the whole 8 feet of tubing to the base of the inner tube.  The
> motor pods were warm.  If the sub had been in the water I don't think I
> would have had as much expansion of the oil.  So I think that is going to
> work pretty good.   Gives me a chance to run the batteries down
> significantly to see how my battery charger works with drained batteries,
> and how long it takes to bring them back up.
>
> Brian
>
>
>
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