Methods and apparatuses for launching unmanned aircraft, including releasably gripping aircraft during launch and breaking subsequent grip motion
Methods and apparatuses for launching unmanned aircraft and other flight devices or projectiles are described. In one embodiment, the aircraft can be launched from an apparatus that includes a launch carriage that moves along a launch guide. The carriage can accelerate when portions of the carriage and/or the launch guide move relative to each other. A gripper carried by the launch carriage can have at least one grip portion in contact with the aircraft while the launch carriage accelerates along the launch axis. The at least one grip portion can move out of contact with the aircraft as the launch carriage decelerates, releasing the aircraft for takeoff. A brake can arrest the motion of the gripper after launch.
1. An apparatus for carrying an unmanned aircraft, comprising:
carriage means for carrying an unmanned aircraft during launch;
support means for supporting and guiding the carriage means along a launch axis during takeoff;
gripper means for releasably carrying an unmanned aircraft, the gripper means being movable relative to the carriage means between a first position with the gripper means positioned to contact the aircraft and a second position with the gripper means positioned to be out of contact with the aircraft; and
brake means for at least impeding motion of the gripper means relative to the carriage means.
2. The apparatus of claim 1 wherein the brake means includes a first brake portion and a second brake portion, the second brake portion be rotatable about an axis relative to the first brake portion and movable along the axis toward and away from the first brake portion as it rotates.
3. The apparatus of claim 1 wherein the gripper means includes a gripper having at least one gripper arm pivotally coupled to the launch carriage, the at least one gripper arm carrying the at least one grip portion positioned to releasably engage the fuselage of the aircraft.
4. The apparatus of claim 1 wherein the gripper means is pivotable relative to the carriage means about a pivot axis offset from the launch axis to pivot downwardly and outwardly away from the launch axis as the gripper means moves from the first position to the second position, and wherein at least a portion of the mass of the gripper means is eccentrically offset from the pivot axis to swing the gripper means from the first position to the second position as the carriage means decelerates.
5. A method for launching an unmanned aircraft, comprising:
releasably supporting an unmanned aircraft with a launch carriage;
releasably engaging the aircraft with a gripper carried by the launch carriage;
accelerating the launch carriage along a launch axis;
disengaging the gripper from the aircraft by moving the gripper relative to the launch carriage from a first position to a second position;
releasing the aircraft from the launch carriage for flight; and
at least restricting motion of the gripper relative to the launch carriage after disengaging the gripper.
6. The method of claim 5 wherein at least restricting motion of the gripper relative to the launch carriage includes engaging two brake portions with each other, with one brake portion being movable with the gripper.
7. The method of claim 5 wherein at least restricting motion of the gripper relative to the launch carriage includes rotating one brake portion about an axis and moving the one brake portion along the axis into contact with another brake portion.
8. The method of claim 5 wherein the launch carriage includes a first brake portion and the gripper includes a second brake portion and wherein at least restricting motion of the gripper relative to the launch carriage after disengaging the gripper includes rotating the second brake portion about an axis and moving the second brake portion along the axis to contact the first brake portion as the gripper rotates relative to the launch carriage.
9. The method of claim 5 wherein the launch carriage includes a first brake portion coupled to a first threaded member and the gripper includes a second brake portion coupled to a second threaded member and threadably engaged with the first threaded member, and wherein at least restricting motion of the gripper relative to the launch carriage after disengaging the gripper includes rotating the second brake portion about an axis and moving the second brake portion along the axis to contact the first brake portion as the gripper rotates relative to the launch carriage, and wherein the method further comprises:
decoupling the second threaded member from the gripper portion; and
rotating the second threaded member relative to the gripper portion to adjust a clearance between the first brake portion and the second brake portion.
10. The method of claim 5 , further comprising decelerating the launch carriage to move the gripper from the first position to the second position.
11. The method of claim 5 wherein releasably engaging the aircraft with the gripper includes releasably engaging a fuselage of the aircraft with the gripper.
12. The method of claim 5 wherein the gripper includes at least one gripper arm pivotally coupled to the launch carriage, and wherein moving the gripper from a first position to a second position includes rotating the at least one gripper arm downwardly and outwardly away from a longitudinal axis of the aircraft.