Re: [PSUBS-MAILIST] Precision prop shaft

["glen brown" <glenbrown@vodamail.co.za>]

Sounds like a good idea James if it works it will be nice and simple I was 
thinking along the lines of gland packing of which has been proven and works 
well and is adjustable.
Glen S.A
----- Original Message ----- 
From: "James Frankland" <james@guernseysubmarine.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, May 26, 2009 11:48 AM
Subject: RE: [PSUBS-MAILIST] Precision prop shaft


Hey all.

i thought of an idea for sealing a leaking through hull.

What about machining a very fine taper onto the outside of the shaft.  Then 
threading the inside of the shaft after it exits the through hull and 
fitting a wing nut and spacer?  Then if the seals leak, you could screw down 
the wing nut which would pull the taper into the gap and jam it shut?

What do you think?  Would pressure push the taper in anyway under normal 
conditions?   im thinking of doing this for the drop lead controlls, 
variable controll and rudder.

Regards
James

----- Original Message -----
From: Smyth, Alec [mailto:Alec.Smyth@compuware.com]
To: personal_submersibles@psubs.org
Sent: Mon, 25 May 2009 21:30:02 -0400
Subject: RE: [PSUBS-MAILIST] Precision prop shaft

There shouldn't be friction, the shaft rotates freely. I do however plan to 
leave it out in the sun on the driveway when we get some good hot days, just 
in case hot temperatures are an issue. Though in the water that would be 
rather unlikely.

________________________________

From: owner-personal_submersibles@psubs.org on behalf of Jon Wallace
Sent: Mon 5/25/2009 8:42 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Precision prop shaft




Nice job Alec.  One question I have given the close tolerances.  I
wonder if friction caused by rotation of the shaft will cause expansion
of the shaft such that it binds or locks up.  Any thoughts on this?

Jon




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