Cameron D. Robertson <<cameron.d.robertson>>
writes:

We are a human-powered helicopter project looking for a tapered
round tube (aluminum or composite) for use as a mandrel for the layup of our
primary-structure carbon fiber tubes. The ideal dimensions would be a tube 16
feet long, tapering from 2.5" at one end to 1.5" or 1" at the other. If you are
aware of any tube/product/manufacturer with dimensions in this ballpark, please
contact Cameron Robertson at Cameron dot D dot Robertson at gmail dot com"