[PSUBS-MAILIST] magnetic base

[David Colombo via Personal_Submersibles]

Hank,  would you also be using a magnetic plate to connect your power
supply contacts?  I was thinking of an oring sealed plate compressed with
the magnets could do the trick.
David

On Mon, Jul 15, 2019, 7:08 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank,
> thinking this through more; if you had your vertical thrusters in a slot
> that
> takes the vertical thrust, then this may impede the detachment of the
> thruster
> if the only force you can apply to the thruster is vertical to break it
> free from
> the magnets. Ie. If a rope is caught in the thruster & you have blown
> ballasts
> then the pull on the rope would be vertical & against the edge of the slot.
>    If the magnets were mounted inside the hull & you removed them, then you
> would have a lot more chance of getting the thruster to drop off.
> Alan
>
> On 16/07/2019, at 10:37 AM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hank,
> the magnets in my open underwater motor from Blue Robotics are coated
> with a marine epoxy & are used in seawater.
> There are large free magnets in old microwaves. I have some tiny 1/4"
> neodymium magnets & they magnetise through an inch of wood.
> I would experiment with putting the magnets inside the hull, & having a
> metal base
> on the thrusters; that way you could assist in the breakaway of the
> thruster by
> removing the magnets, rather than just rely on pulling power. Additionally
>  you
> wouldn't need to paint them  & could experiment more readily with the
> power by
> adding & subtracting. Another thought is having magnetic bases that are
> used for mounting dial gauges; you could turn their switch to remove them.
> Good idea re magnets Hank, hadn't considered that.
> Alan
>
> On 16/07/2019, at 9:10 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan,
> Yes I will make a pocket to take the vertical force.  I think since the
> magnets are so cheap, I will just replace them when they corrode.  Maybe
> spray them with WD-40.   I did that with my hatch spring and it is amazing
> how well it worked.
> Hank
>
> On Monday, July 15, 2019, 3:02:24 PM MDT, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> If you could mount them in a slot so that the vertical thrust pushes
> against the
> edges of the slot, that would require less power from the magnets. ( you
> were
> probably planning that anyway).
> Magnets are corrosive so you would have to either coat them or mount them
> Inside the hull. They should magnetise through the hull if strong enough.
> If the magnets were mounted inside the hull you may be able to knock them
> sideways out of the way to help release the thruster.
> I would have some way of pinning the thrusters during transport, & take the
> magnets off ( some how ) during storage.
> One thought is that a powerful electro magnet may help with the removal of
> the magnets.
> Alan
>
> On 16/07/2019, at 8:25 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All,  I want to make magnetic bases for my vertical thrusters on
> E3000.  The thrusters are mounted to the hull section that jettisons witch
> is bad.  I figure the best way to jettison the motors in my case is to
> mount them with magnets that will break away.  Anyone try this?
> Hank
>
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