"plasticguy" wrote in message
...


91.309 says that ONLY GLIDERS (aircraft conforming to part 91 including
registration and certification requirements)
may be towed.

91.311 says that anything else to be towed (undefined stuff like banners,
ultralights, barges) by an aircraft
may only be done by waiver from the administrator.

You're inventing the stuff inside your parens. The Sparrowhawk meets the
explicit legal definition of "GLIDER" given in the FARs.