RE: [DML] Side Windows

["PJ Grady" <rob@xxxxxxxxxxx>]

Andrei,

I believe that this "shear force" does not cause breakage because auto glass
laminates are incredibly strong when the force is spread ACROSS its vertical
plane. One of you engineer types might explain this better. The reason I
happened to observe this roof flex is because the car in question had been
on our lift for several days for extensive repairs. I happened to be
standing near it with no one else near the car on this particular day when
suddenly the rear glass exploded to my utter surprise! A careful
investigation of the cause revealed that one of the four rivets holding the
luggage net inner and outer support clips (L/H outer to be exact) had been
installed too deeply causing it to come in direct contact with the glass.
This contact on the SURFACE of the glass is what caused the failure. We
subsequently replaced the glass on a proper bed of Urethane adhesive and
merrily went about our restoration with little concern about it's remaining
time on the lift. We had found and corrected the cause of the problem and
the new glass performed it's load bearing duties like the hundreds of other
Deloreans that have "passed through the gates". If you wish to recreate this
scenaro simply remove the quarter panels, cut through the Urethane with a
Pneumatic knife, and re-install the quarter panels :). You are now ready to
raise the car. Our lift uses four rubber padded feet which lift the car at
the reinforced corners of the underbody which carry corresponding "Jack Post
Plates" so I know this is SOP. This is how we came to notice the tremendous
distortion of the body without the rear glass installed. BTW Urethane is
SEVEN TIMES stronger than RTV silicone adhesives so this explains why glass
and Urethane make an excellent structural component. I hope this convinces
you without having to go through the trouble of your own investigation.   

Respectfully,

Robert Grady
-----Original Message-----
From: Andrei Cular [mailto:acular@xxxxxxxxxxxxxxx] 
Sent: Thursday, February 12, 2004 9:24 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Side Windows

Rob

If you say you have seen it move that much I will take your word for it.  If
the body is flexing that much why don't we see more broken rear windows? A
vertical motion like that would be a shear force in the adhesive which
probably wouldn't be translated to the glass unless you have hard rubber
spacers on top and bottom of the glass keeping it centered.  A simple way to
show what I am talking about it to take 2 flat plates and glue them together
with some RTV.  Try pull them apart, they probably wont budge, now try slide
them apart.  The shear force will break the bond much easier.

When you had the car on the lift what motion cause the flex and where was
the car supported?  I would like to try and duplicate what you saw.


Andrei



----- Original Message ----- 
From: "PJ Grady" <rob@xxxxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Thursday, February 12, 2004 8:32 AM
Subject: RE: [DML] Side Windows


> Hello Andrei,
>
> Sorry but I beg to differ. I had an occasion to raise a Delorean on a lift
> with the back windscreen removed and was amazed to see the gap between the
> top and bottom of the glass opening close by over a 1/4 inch!
> If that doesn't prove it provides structural integrity than what would?
>
> Respectfully,
>
> Robert Grady
>
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