A single electric motor, 10x4.7 prop, 45degrees canted upwards to provide forward and upwards thrust, just behind the CG, ducted with controllable vanes at the bottom and narrowing to a vane-linked elevator and huge ailerons and rudder for the other two axis around the CG.
The duct to be made big enough, enough void within to even out the swirls and pulsation of the prop fan. One entry to the prop fan, two main exits with one at the vaned area and one at the rear. Net area of vaned area and rear exit should be lesser than the entry. There shall be sliding plates at the diagonal corners of the duct below the prop fan to provide torque correction force. Instead of linking it to the aileron servo, we can leave it manual, adjusted after flight testing.
The bottom vanes shall be at 45 degrees pointing rearwards, but can be closed. With the vanes closed, the model is to fly like a normal powered plane with the pair of wings providing lift and countered by the downward force of the elevator. With the vanes opened, the elevator shall move upwards to push the tail down so as to compensate the nose droping moment.
The pair of low aspect ratio wings shall be located relative to the CG, to glide when the elevator is at neutral (vanes closed condition). There shall be dihedral for stability as the ailerons are omitted for the first test model. The wings to be top mounted, just below the lower of the prop fan disc.
The fuselage is a longish pod to a rectangular box. A large fin is mounted on top of the box, and the rudder extends to the box. The elevator is cut out from the bottom of the box.
Model to be 3 Channel. Throttle, Elevator, Rudder. 2210 motor, 3S1300mah battery, 10x4.7 propellor, 2 servos, 30A ESC, Hitec receiver.
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