An aircraft includes; a plurality of rotor units each of which includes a propeller and a motor which drives the propeller, and generates thrust for flight of the aircraft; a controller which controls rotation of the propellers included in the plurality of rotor units; a balloon which laterally covers the plurality of rotor units; and a detector which detects a state of the aircraft, wherein the controller decreases a rotational speed of the propeller included in at least one rotor unit among the plurality of rotor units, according to a result of detection by the detector.

An aircraft includes; a plurality of rotor units each of which includes a propeller and a motor which drives the propeller, and generates thrust for flight of the aircraft; a controller which controls rotation of the propellers included in the plurality of rotor units; a balloon which laterally covers the plurality of rotor units; and a detector which detects a state of the aircraft, wherein the controller decreases a rotational speed of the propeller included in at least one rotor unit among the plurality of rotor units, according to a result of detection by the detector.

An aircraft includes: a plurality of rotor units each including a propeller and a motor that drives the propeller; a balloon that laterally covers the plurality of rotor units, across a height of the plurality of rotor units in an up-and-down direction; and a drive unit configured to change the external shape of the balloon at a predetermined timing.

An aircraft includes: a plurality of rotor units each including a propeller and a motor that drives the propeller; a balloon that laterally covers the plurality of rotor units, across a height of the plurality of rotor units in an up-and-down direction; and a drive unit configured to change the external shape of the balloon at a predetermined timing.

An aircraft includes: a plurality of rotor units each of which includes a propeller, and a motor which drives the propeller; and a balloon to which the plurality of rotor units are connected and in which a gas less dense than air is contained. At least one rotor unit among the plurality of rotor units generates downward thrust.

An aircraft includes: a plurality of rotor units each including a propeller and a motor that drives the propeller; a plurality of shock absorbers including a first shock absorber and a second shock absorber different from the first shock absorber, the first shock absorber defining a first gas chamber containing a first gas that is less dense than air; and a release unit that is disposed on the first shock absorber and configured to release the first gas contained in the first gas chamber at a predetermined timing.

An aircraft includes: a plurality of rotor units each including a propeller and a motor that drives the propeller; a plurality of shock absorbers including a first shock absorber and a second shock absorber different from the first shock absorber, the first shock absorber defining a first gas chamber containing a first gas that is less dense than air; and a release unit that is disposed on the first shock absorber and configured to release the first gas contained in the first gas chamber at a predetermined timing.

An aircraft includes: a plurality of rotor units each including propeller and motor that drives propeller; a shock absorber covering an entire vertical length of a lateral side of the plurality of rotor units; and a plurality of rudders each being disposed downstream of a corresponding one of the plurality of rotor units and rotating about axis of rotation that extends in a direction intersecting a flow direction of air current generated by the corresponding one of the plurality of rotor units.

An aircraft includes: a plurality of rotor units each including propeller and motor that drives propeller; a shock absorber covering an entire vertical length of a lateral side of the plurality of rotor units; and a plurality of rudders each being disposed downstream of a corresponding one of the plurality of rotor units and rotating about axis of rotation that extends in a direction intersecting a flow direction of air current generated by the corresponding one of the plurality of rotor units.

An airship hull is disclosed. The airship hull comprises a gas-tight shape fabricated from a membrane. The airship hull comprises one or more fibers applied to an outer surface of the gas-tight shape in a continuous manner such that a particular one of the one or more fibers wraps around a circumference of the gas-tight shape multiple times, wherein the applied one or more fibers are affixed to the outer surface of the gas-tight shape.