-----Original Message-----
From: Brian Cox <ojaivalleybeefarm@dslextreme.com>
To: personal_submersibles@psubs.org
Sent: Tue, Apr 6, 2010 4:38 pm
Subject: RE: [PSUBS-MAILIST] rotating tru hull
Vance, How are those bushings set up? can you use
brass, or oil impregnated? or are they a actual ball or neddle
berings ... or all of the above.
Brian
Frank,
George's rotating shaft penetrators are simplistic at best. A better
arrangement would be to incorporate an internal bushing set to support the
shaft and keep things from rubbing stainless to stainless. Tolerances than can
be minimized to the O-ring requirements.
As to placement, I think you will find that o-rings in the shafts undergo
all sorts of radial and axial stresses and the WILL leak, probably sooner
rather than later.
Vance
-----Original
Message-----
From:
ShellyDalg@aol.com
To:
personal_submersibles@psubs.org
Sent: Tue, Apr 6, 2010 2:36 pm
Subject:
Re: [PSUBS-MAILIST] rotating tru hull
I
think the reasoning behind this is that when the shaft rotates there is more
surface area touching the o ring when it is in the collar and therefore the
o ring does not have a tendentcy to turn in the o ring
groove,
Hi Brian. That's a good thought. I don't have any rotating shaft
thru-hulls in my boat but it's good to understand what works best and why.
Thanks for that.
I've not been working on the sub much lately as I'm trying to get ready
for the move to Daytona. Hardwood floors and such around the house and setting
up property management for renting this house. Will you be at this year's
convention ? Hope to see you there.
Frank D.