Hi Eddie,

I live in the same area that Eric lives in. I have seen Eric's third version of his Harrier. And, yes, it does have a reaction control system using bleed air from the ducted fan. I'll try to describe it for you from memory. Keep in mind that it was not designed to be completly scale. For example, it had two (one on each side) main thrust nozzles. Also keep in mind that Eric is an accomplished model helicopter pilot.

The roll is controlled by a vent close to each wing tip. The vent is about 2" x .5", with the long dimension oriented front to back. Inside the vent is a rotating valve that can direct the bleed air up and down at varying rates. A gyro was used to assist in roll stability.

Pitch and yaw is controlled by a plate behind the tail that can rotate in the yaw and pitch directions simultaneously. Just in front of the plate is an exit nozzle for more bleed air.

Thrust is provided by two (one each side) rotating nozzles located at the CG.

From what I understand, Eric's third version came out just a bit too heavy to do proper vertical take off's and landings. (I have witnessed that one flying.) However, I have been told by Eric that his second version did indeed take off vertically, transistion to forward flight and back to hover, and land vertically. He did not mention the wind conditions at the time. I'll see if I can clarify that next time I talk to him.

Regards,
...jim