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MODEL 209 TILT ROTOR/WING CONCEPT Advanced, two-rotor tiltwingThe Model 209 is a concept which combines the features of the V-22 Osprey and the XC-142A tilt wing transport. The payload is packaged in a very compact, small fuselage. The entire wing tilts with the transition angle in a manner which eliminates the open fuselage top. The wing is extended beyond the nacelle for improved span loading (induced drag) during cruise. The tip extensions also provide roll control in cruise and yaw control in hover, thus eliminating the need for rotor swash plates. The rotors are large scimitar variable pitch, no-cyclic propellers. Pitch control during hover is provided by a horizontal “fan tail” which is covered for cruise RCS. The props turn top-in, so that the inboard wing is in downwash during transition. The outboard wing panels are varied to optimize their local angle of attack during all stages of transition providing the proper control power. The configuration does not require wing flaps. The scimitar shape of the large, 2-blade rotors is designed to aerolastically vary the twist distribution in order to reduce the compromise in blade twist between hover and cruise. The result is a compact, simple aircraft compared to the conventional tilt-wing/tilt-rotor configuration. The wing download during hover is eliminated, resulting in improved hover power required with a positive ground effect due to the fuselage shape.
MODEL 209 TILT ROTOR/WING CONCEPT
Advanced, two-rotor tiltwing
The Model 209 is a concept which combines the features of the V-22 Osprey and the XC-142A tilt wing transport. The payload is packaged in a very compact, small fuselage. The entire wing tilts with the transition angle in a manner which eliminates the open fuselage top. The wing is extended beyond the nacelle for improved span loading (induced drag) during cruise. The tip extensions also provide roll control in cruise and yaw control in hover, thus eliminating the need for rotor swash plates. The rotors are large scimitar variable pitch, no-cyclic propellers. Pitch control during hover is provided by a horizontal “fan tail” which is covered for cruise RCS. The props turn top-in, so that the inboard wing is in downwash during transition. The outboard wing panels are varied to optimize their local angle of attack during all stages of transition providing the proper control power. The configuration does not require wing flaps. The scimitar shape of the large, 2-blade rotors is designed to aerolastically vary the twist distribution in order to reduce the compromise in blade twist between hover and cruise. The result is a compact, simple aircraft compared to the conventional tilt-wing/tilt-rotor configuration. The wing download during hover is eliminated, resulting in improved hover power required with a positive ground effect due to the fuselage shape.
