At 12:42 30 April 2007, Wayne Paul wrote:
Al,

In the US formula is used to determine whether a fixed
wing aircraft with an
engine is classified as a glider or as an airplane.

Wayne
HP-14 '6F'
http://www.soaridaho.com/

All very well but, when the engine(s) fail(s), no number
of formulae will ever determine that aircraft to be
anything other than a glider...

;o)