On Mon, 7 Mar 2005 at 18:59:18 in message
, Larry Dighera
wrote:

I don't see the control system as being that difficult a hurdle.
After all, the Harrier is able to hover with only two nozzles.

I think you will find that the Harrier has four main swivelling nozzles,
the front pair are cold air from the compressors, the rear pair are hot
exhaust from the turbine. In addition it has air driven control jets at
nose, tail and both wing tips. All of then are required for hovering
flight.
--
David CL Francis