Yeah, the uni or tow is wrapped over the fitting and down into the inside of the hull, with of without any extra plywood layers.

They are pretty basic and easy to make as strong as you like. Not sure how you'd give it that final level of finish shown, or why you'd bother going that far.

I think it has been proven that you can make almost anything on a boat using just composites like that. Probably saves a fair bit and not too long to do.
I think i read a book where the author was explaining how to build with no SS fittings at all. It had lots of nice drawn picures in it. From quite a ehile ago, 15 plus years.

--------------------------------------------
On Mon, 18/6/18, StoneTool owly@ttc-cmc.net [harryproa] <harryproa@yahoogroups.com.au> wrote:

Subject: Re: [harryproa] Hard Points in foam sandwich panels
To: harryproa@yahoogroups.com.au
Received: Monday, 18 June, 2018, 10:23 AM


 












   
Guess I have zero confidence in
aluminum bonded to the surface of fiberglass, not that
I don't use
epoxy to bond aluminum pieces together that are not
critical.  I'd
be much more comfortable with a structure made from
carbon tow or
tape.  For one thing it conforms to the shape
naturally.   Below
is a before and after showing a shroud attachment on a
KD 860 from
Bernd's Utube slide show.   https://www.youtube.com/watch?v=Bv-ath_xmjY

    A beautiful finished product!  I assume from
the angles that
we are looking the same fitting on opposite sides of
the boat.  
Presumably the tape wraps down into the hull around a
substantial
wood reinforcing plate.   I'm curious what the
bushing showing
is?  Presumably a metal bushing goes inside of
that.  Somebody put
some real time into making it look good.



                           
                               
   
                           
                               
   
            H.W.











On 06/17/2018 07:36 PM, Rick Willoughby rickwill@bigpond.net.au
[harryproa] wrote:



 


You get a good bond using that process.  The
al;uminium
will still slowly oxidise if the edges are not
dealed and
that will be difficult with a rubbing
strip.



Glass is much
harder than aluminium so a
better wear rubbing surface.  I just use 400g
triaxial
tape for protecting contact areas.  Could
achieve similar
toughness with three layers of 200gsm tape.
 There is no
deterioration issue with glass on glass.







On 18 Jun
2018, at 10:28 am, Doug Haines
doha720@yahoo.co.uk
[harryproa] <harryproa@yahoogroups.com.au>
wrote:


I
used some
metals one time in an older boat, and
to bond it i
put some wet epoxy on the metal
surface and sanded
it so the epoxy and the metal surface
and dust
particles were all being mixed into
the slurry.
Then add what ever you want to bond on
with epoxy
bog and glass or
whatever.

























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