In a message dated 7/16/2003 11:28:02 AM Pacific Daylight Time, gfoley@xxxxxxxxxxxxxxx writes: << It has to be used if the engines are mounted aft on the fuselage. I suspect that the control moments would be too much affected by engine thrust if the horizontal stabilizer were close to the engine exhaust gas stream. >> That is not true. The Caravelle had a more conventional tail