I'm a Harrier pilot, AV-8B. I was a Maint Test pilot and have an Aeronautical Degree from Embry Riddle Aeronautical Univ. Several things have not yet been mentioned. People have been trying for years to build a Harrier. Roll/yaw coupling, intake momentum drag, CG vs. aerodynamic center, and torque for instance. All these have caused immediate roll overs. Torque and P factor are the result of fan thrust and cause rolling moments. Rolls Royce balanced this by having fan rotate one direction and turbine the opposite, so forces balance at full power. Puffer ducts work up to about 20-30 kts of wind (hover). Flt controls begin to work 170-200 kts. The problem is in between these speeds, the jet is balastic both accelerating and decelerating - and must be pointed Directly into the Relative wind during those periods of flt. Also in those periods, negative static and dynamic: yaw, pitch, and roll stabilities. The real jet is extremely dangerous and miraculous at the same time. I too would like to model this plane, but I'm resigned to the knowledge that just a little slow flt w/ vectored thrust, ie still wingborne , still conventional flt controls will ever be possible or safe. DT Maj. USMC