Abstract: An example method includes receiving pitch angle sensor information indicative of a pitch angle of a vehicle, wherein the vehicle comprises a main landing gear having a strut and a pitch control surface configured to control the pitch angle of the vehicle; determining a trailing-edge-up limit for upward movement of the pitch control surface to control a de-rotation rate of the vehicle as the vehicle lands; receiving load sensor information indicative of a load on the strut of the main landing gear of the vehicle; based on the pitch angle of the vehicle being below a pitch angle threshold, determining an updated trailing-edge-up limit based on the load on the strut; and controlling the pitch control surface based on the updated trailing-edge-up limit.

Abstract: An example method includes receiving pitch angle sensor information indicative of a pitch angle of a vehicle, wherein the vehicle comprises a main landing gear having a strut and a pitch control surface configured to control the pitch angle of the vehicle; determining a trailing-edge-up limit for upward movement of the pitch control surface to control a de-rotation rate of the vehicle as the vehicle lands; receiving load sensor information indicative of a load on the strut of the main landing gear of the vehicle; based on the pitch angle of the vehicle being below a pitch angle threshold, determining an updated trailing-edge-up limit based on the load on the strut; and controlling the pitch control surface based on the updated trailing-edge-up limit.

Abstract: Embodiments described herein provide for detecting an angle of a cable attached to a rotorcraft for transporting a hanging payload using a pair of linear displacement sensors that are coupled to both the rotorcraft and the cable. One embodiment is a cable angle detector mounted to an underside of a rotorcraft. A cable has one end coupled to the rotorcraft and another end coupled to a payload. A pair of linear displacement sensors has one end coupled to the underside of the rotorcraft and another end coupled to the cable. The detector measures the displacement of the sensors and calculates an angle of the cable relative to the rotorcraft based on the measurements.

Abstract: Embodiments described herein provide for detecting an angle of a cable attached to a rotorcraft for transporting a hanging payload using a pair of linear displacement sensors that are coupled to both the rotorcraft and the cable. One embodiment is a cable angle detector mounted to an underside of a rotorcraft. A cable has one end coupled to the rotorcraft and another end coupled to a payload. A pair of linear displacement sensors has one end coupled to the underside of the rotorcraft and another end coupled to the cable. The detector measures the displacement of the sensors and calculates an angle of the cable relative to the rotorcraft based on the measurements.