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Re: [PSUBS-MAILIST] Through Hulls Complete?



James,
It looks fine. You might want to consider two delrin washers between your stop ring and the hull penetration and a matching set inside to give you bearing surfaces without metal to metal contact. The real problem for me is the length of unsupported shaft between the thruster body and the penetrator. It's quite a lever compared to, say, Kittredge's design, which puts the thruster can right next to the thru-hull.
Vance



-----Original Message-----
From: James Frankland <james@guernseysubmarine.com>
To: personal_submersibles@psubs.org
Sent: Tue, Jul 28, 2009 5:41 am
Subject: [PSUBS-MAILIST] Through Hulls Complete?

Hi All

Have a look at my motor through hulls and let me know what you think.  I sort of 
made it up from a design Emile sent me, Kittredge, and me.

I wasnt really sure what i was going to do, but i got in the workshop, started 
and this is what i ended up with....

http://www.guernseysubmarine.com/index_files/Page20723.htm

The main 28mm bar screws into the Minn Kota motor pods.  There is 15mm bore all 
the way through and then a 20mm bore at the motor end to create a "stop" for the 
epoxy fill.

I intend to put 2 long 4mm brass rods all the way through and fill the entire 20 
- 15mm bore with epoxy.

There will be a washer welded on to the outside of the bar to create a stop and 
a plastic washer.  Also a square milled flat to attach the handle.  (all yet to 
complete)

Question:  Do i need to score or rough up the inside of the bore to create 
better adhesion for the epoxy?

And suggestions, thoughts?  I'm unclear with this bit, so any comments are 
welcome, even if its "thats a load of crap, do it again".

Kind regards 
James