On Apr 26, 7:32*pm, Bob Kuykendall wrote:
I thought it was really cool that you could
cast a 15m sailplane in concrete and rebar, ballast it with tungsten
to get the CG right, and it would smash right along at about 40:1 at a
few hundred knots. Of course, launching it would be a real bear, but
that would be somebody else's problem.

Did you know the Germans made a "glide bomb" with reinforced concrete
wings during WW II?

http://www.flickr.com/photos/67307569@N00/2658890478/