Provided are: an aircraft that can fly stably even when water is discharged from a hose installed on the airframe thereof; and an aircraft system that uses the aircraft. This aircraft system comprises: a master aircraft 10; three slave aircrafts 20; and a remote control device 30 that is for making the aircraft fly as a unit. Each slave aircraft 20 has: four rotary blade portions that have propellers 221; and a suspending means 23 that is for suspending a prescribed part of a hose 50 that is for discharging water. The master aircraft has: four first rotary blade portions that have first propellers 121 that have been arranged to rotate in a horizontal plane; four second rotary blade portions that have second propellers 131 that have been arranged to rotate in a vertical plane; and a nozzle 15 on which a tip end part of the hose 50 is installed. The direction of the center axis of the nozzle 15 is parallel to the direction of the rotational axes of the second propellers 131.

Provided are: an aircraft that can fly stably even when water is discharged from a hose installed on the airframe thereof; and an aircraft system that uses the aircraft. This aircraft system comprises: a master aircraft 10; three slave aircrafts 20; and a remote control device 30 that is for making the aircraft fly as a unit. Each slave aircraft 20 has: four rotary blade portions that have propellers 221; and a suspending means 23 that is for suspending a prescribed part of a hose 50 that is for discharging water. The master aircraft has: four first rotary blade portions that have first propellers 121 that have been arranged to rotate in a horizontal plane; four second rotary blade portions that have second propellers 131 that have been arranged to rotate in a vertical plane; and a nozzle 15 on which a tip end part of the hose 50 is installed. The direction of the center axis of the nozzle 15 is parallel to the direction of the rotational axes of the second propellers 131.

Embodiments of the present invention relate to a self-propelled device. The self-propelled device includes: a body defining a first space and a second space in communication with the first space, wherein the volume of the second space is less than the volume of the first space and the second space is closer to an edge of the body than the first space; a moving module adjacent to the body; an air extraction module disposed on the body and in communication with the first space; and an air pressure sensor disposed on a side of the second space. The self-propelled device is configured to move on a panel surface.

Embodiments of the present invention relate to a self-propelled device. The self-propelled device includes: a body defining a first space and a second space in communication with the first space, wherein the volume of the second space is less than the volume of the first space and the second space is closer to an edge of the body than the first space; a moving module adjacent to the body; an air extraction module disposed on the body and in communication with the first space; and an air pressure sensor disposed on a side of the second space. The self-propelled device is configured to move on a panel surface.

An apparatus for cleaning a surface includes a support having a cavity, a conduit, at least one cleaning element, and a skirting member. A pressurized cleaning fluid is controllably directed to the cavity. When the apparatus is applied to a surface, the skirting member forms a fluid flow region with a reduced cross-sectional area through which the cleaning fluid must travel, increasing the velocity of the fluid and reducing the pressure in the fluid flow region. With a reduced pressure now in the fluid flow region between a surface to be cleaned and the skirting member, a greater atmospheric pressure beyond the skirting member employs the Bernoulli principle to force the skirting member, attached to the support, against the surface to be cleaned.

An apparatus for cleaning a surface includes a support having a cavity, a conduit, at least one cleaning element, and a skirting member. A pressurized cleaning fluid is controllably directed to the cavity. When the apparatus is applied to a surface, the skirting member forms a fluid flow region with a reduced cross-sectional area through which the cleaning fluid must travel, increasing the velocity of the fluid and reducing the pressure in the fluid flow region. With a reduced pressure now in the fluid flow region between a surface to be cleaned and the skirting member, a greater atmospheric pressure beyond the skirting member employs the Bernoulli principle to force the skirting member, attached to the support, against the surface to be cleaned.

A building exterior wall cleaning robot is disclosed. The building exterior wall cleaning robot comprises: a robot body which cleans a building exterior wall while being suspended on ropes and has a predetermined weight; an LM guide which is coupled to the robot body and provided to have a predetermined length; and a moving unit which is connected to the ropes and moves along the LM guide to move the point on which the tension of the ropes is acting.

A building exterior wall cleaning robot is disclosed. The building exterior wall cleaning robot comprises: a robot body which cleans a building exterior wall while being suspended on ropes and has a predetermined weight; an LM guide which is coupled to the robot body and provided to have a predetermined length; and a moving unit which is connected to the ropes and moves along the LM guide to move the point on which the tension of the ropes is acting.

A reconfigurable surface cleaning apparatus has a surface cleaning head, a support structure moveably mounted to the surface cleaning head between a storage position and a floor cleaning position and a portable cleaning unit removably mountable to the support structure. The support structure has a lower portion and an upper portion, the upper portion is rotationally mounted to the lower portion between a first configuration and a second configuration wherein, when the support structure is in the storage position and the support structure is in the first configuration, the upper portion extends upwardly from and lower portion and, when the support structure is in the storage position and the support structure is moved to the second configuration, the upper portion is rotated forwardly.