Jim Logajan wrote:
While searching for videos demonstrating composite construction on Youtube,
I came across this rather dated video of Burt Rutan and Mike Melvill
demonstrating the advantages of composites over aluminum:

http://www.youtube.com/watch?v=7eUt0YnNF3o

My "non-metallic structures" instructor, a composites guy retired from
Douglas Aircraft, showed that video at A&P school. He told us that the
demo was bogus.