Hover delivery of cabin payload in tilt-rotor and tilt-wing aircraft
View Patent ↗A payload or cargo is delivered from a cargo hold of an aircraft during flight, by orienting the fuselage into a nose-up and tail-down position of at least 30 degrees off horizontal, and lowering the cargo from a cargo hold in the fuselage by means of one or more lines. Preferred vertical takeoff and landing (VTOL) aircraft include tilt-rotor or tilt-wing aircraft, and especially preferred aircraft are capable of generating control moments with their rotors to assist in orientating the fuselage of the aircraft into a nose-up and tail-down position.
1. A method of delivering an item of cargo from a cargo hold of an aircraft during flight, comprising:
orienting the aircraft into nose-up and tail-down position at least 30° off horizontal;
lowering the cargo from the cargo hold using a line; and
uncoupling the line, wherein the aircraft is a tilt rotor aircraft having an airframe and first and second rotors, each having an axis of rotation, further comprising the step of operating a control interface that assists in tilting the airframe while the rotor axes of rotation remain within 15 degrees of vertical.
2. The method of claim 1 , wherein the step of orienting comprises pointing the nose to within 15° of vertical.
3. The method of claim 1 , wherein the step of orienting comprises pointing the nose in a range from 45° to 100° nose up.
4. The method of claim 1 , wherein the aircraft is a VTOL aircraft.
5. The method of claim 1 , wherein the aircraft is a tilt-rotor aircraft.
6. The method of claim 1 , wherein the aircraft is a tilt-wing aircraft.
7. The method of claim 1 , further comprising converting the aircraft from a wing-borne flight mode to a rotor-borne flight mode.
8. The method of claim 1 , further comprising executing the step of orienting after beginning conversion of the aircraft from a wing-borne flight mode to a rotor-borne flight mode.
9. The method of claim 1 , further comprising executing the step of orienting after completion of conversion of the aircraft from a wing-borne flight mode to a rotor-borne flight mode.
10. The method of claim 1 , further comprising providing a guide that biases the cargo against a floor of the cargo hold.
11. The method of claim 1 , further comprising providing a guide that biases the cargo away from a wall of the cargo hold.
12. The method of claim 1 , further comprising utilizing an at least partially automatic control to execute the step of orienting.
13. The method of claim 1 , wherein the cargo has a wheels-down or track-down configuration, and further comprising operating a second line to help position the cargo in the wheels-down or track-down configuration.
14. The method of claim 1 , further comprising the step of using a horizontal movement of the aircraft to help position the cargo in the wheels-down or track-down configuration.
15. The method of claim 1 , further comprising the step of an operator trying to maintain a position of the aircraft stationary with respect a loading zone during the step of lowering the cargo.