"Jim Adney" wrote in message
...

| You're right, of course, but what I meant, was that a tube is a single
| piece, hence solid even though hollow. The preceeding discussion was
| of a "tube" made up of a bunch of separate strips.
|
| I don't think there are any race cars out there which use chassis made
| of tubes which consist of a bunch of separate strips. I think you'd
| agree that this would be a structural waste of effort.

The edge connections would inevitably be weak points. Didn't Titanic pop
many of her joints when she hit the berg?

N