John;
One more thing-- if one is using a lower- strength aluminum alloy (for
formability, that's what was available, or whatever) then Dave's point
is well taken. Fasteners in thin sheets are frequently strengthened by
the use of "doubler plates" which are nothing more than using two
thicknesses in the area of the fasteners. The extra thickness can be
riveted or bonded in place.
Extra stiffness can be achieved by bending the doubler plate's inner
edge up 90 degrees to form a "longeron" stiffener. In that case, you'd
probably want to put the doubler plate on the inside of the panel.
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of Dave Dahlgren
Sent: Tuesday, December 28, 2004 5:23 PM
To: John Burk; land-speed@autox.team.net
Subject: RE: Dzus Spacing
No I was pointing out why the stiffness is not the only consideration.
When
I looked at the material choices one of the things I gave some
consideration
to was the yield strength for the button to pull through the panel.
hence my
opinion that the material is of some consideration. When ever I make an
engineering decision I always test my reasoning by examining the
extremes to
see if what I believe to be true will provide logical results at both
extremes along with the set of conditions I am working with. Call it a
plot
of the reasonability of the solution if you like.
Dave
> -----Original Message-----
> From: owner-land-speed@Autox.Team.Net
> [mailto:owner-land-speed@Autox.Team.Net]On Behalf Of John Burk
> Sent: Tuesday, December 28, 2004 3:34 PM
> To: land-speed@Autox.Team.Net
> Subject: Re: Dzus Spacing
>
>
> Dave - So you're saying one button per .95 sq. ft. is not enough
> and that I
> should have twice as many of them ? 32 Dzus buttons in a 96" panel
seems
> aerodynamicly costly .
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