[PSUBS-MAILIST] magnetic base

[Alan via Personal_Submersibles]

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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