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RE: Thru Hull Control
I've been trying to just sit back and learn a little about the group and
only write in when I thought I could help. Well this time I probably
can. I don't have a sub under construction but am very familiar with
shaft seals of many types for many purposes.
I would recommend a simple double o-ring seal surrounding a ball type
thrust bearing and two needle type rotating bearings to absorb the
differential pressure and bending moments respectively. This assembly
would be flooded with a waterproof grease via a zirc fitting located
opposite a bleed screw (to let the grease flow out during maintenance).
The whole thing could be manufactured as an assembly with a flange to
hold a static seal. A nut on the inside could sandwich the hull to
prevent rotation. It could then be installed in a single reamed hole to
reduce the amount of machining on the hull and reduce the cost overall.
The ball and thrust bearings would also be very economical.
This should provide a good starting point for discussion in the group.
Richard D. Morrisson
> ----------
> From: Scott Shakespeare[SMTP:shakey10@hotmail.com]
> Sent: Tuesday, June 16, 1998 2:28 PM
> To: personal_submersibles@psubs.org
> Subject: Thru Hull Control
>
> I'm at the point with my 1 ATM submersible where I need to install
> some
> sort of thru-hull device that is water tight but will rotate a shaft.
> ie...to rotate a control plane. For those of you who have built subs,
>
> how have you handled this problem? Is there something that I can buy
> that works well, I had some ideas for building something custom, but I
>
> dont think they will work great. Obviously I would need it to
> withstand
> pressure at 100 foot depth.
> Does anybody have any ideas?
>
> Scott Shakespeare
>
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