A U-2 constructed of lead would have the same glide ratio as one
constructed of balsa wood. It would glide faster, but just as far.
vince norris

Say what?
Dave

Um, I think there's be a slight difference in wing loading which just might
have a minor affect on glide ratio. Translation: the lead U-2 would glide like
a bowling ball.

Dan, U. S. Air Force, retired