The solution is simple. Cut the panel from 0.090 2024. The panel will
never wrinkle. Then paint the panel with an epoxy based paint. It will look
great for years.

We have them CNC machined all the time and they look great. email me if you
need me to set you up with a place that can do that.

Thanks, Chris

wrote in message
...
I've seen a few homebuilts with part of the fuselage panel that are flat
aluminum that are quite wrinkly and tend to "oil can" and make noise in
various flight attitudes. I haven't seen cross breaks used to stop this,
although it is used in duct work to stiffen flat panels. (cross breaks
are
slight bends in the metal, done diagonally from corner to corner)

Another thought to reduce this noise is to spray urethane foam on the
panels.
I know that this foam is combustable, but I figure for it to get on fire
would
mean the pilot and passenger cabin is already engulfed, so it wouldn't
really
matter.

What do you think?

thanks,
tom pettit