A method of controlling an airborne object (2), such as a kite or a glider, is disclosed. The airborne object (2) may be an airborne energy generating system. The airborne object (2) is coupled to a part of a wind turbine (1), such as a nacelle (4), a tower (3) or a foundation, via a cable (7). At least one parameter related to movements (8) of the tower (3) of the wind turbine (1) is measured, and a cable force (9) of the cable (7) acting on the wind turbine (1) is adjusted, based on the at least one measured parameter. Thereby the tower movements (8) can be counteracted and fatigue can be reduced.

Methods and devices taught in the present disclosure address the need for improving stability and performance of delta wing kites. Delta wing kites as disclosed include a delta wing shaped sail reinforced with rigid or semi-rigid wing spars and a center spar, the wing spars and central spar being housed and secured within corresponding sleeves. A combination of various elements such as fuselage and corresponding through-holes, front and back pods, keel and top pockets provides improved stability and performance for the disclosed devices.

Methods and devices taught in the present disclosure address the need for improving stability and performance of delta wing kites. Delta wing kites as disclosed include a delta wing shaped sail reinforced with rigid or semi-rigid wing spars and a center spar, the wing spars and central spar being housed and secured within corresponding sleeves. A combination of various elements such as fuselage and corresponding through-holes, front and back pods, keel and top pockets provides improved stability and performance for the disclosed devices.

An apparatus for extracting power includes a track and an airfoil coupled to the track. The track includes first and second elongate sections, where the first elongate section is positioned above the second elongate section. The airfoil is moveable in opposite directions when alternately coupled to the first elongate section and second elongate section.

A hybrid kite having an integrated compartment that is inflated with a gas which is lighter than air; the kite is further equipped with a wind turbine generator for the purpose of generating electricity at a high altitude, which can be utilized by the kite or be relayed to the ground for practical use. The kite is anchored in the air as a result of an upward pulling/push force (drag) created by wind, and a combination of buoyancy, to keep the generator/s aloft for an extended period of time beyond 24 hours.

The kite may also serve the purpose of an antenna, to send and receive wireless communication from a base. Moreover the kite can serve as a surveillance vantage point, when equipped with a camera, video camera, microphone and lights, to give an aerial vantage point of a given location.

Numerous other applications for the invention will be realized in conjunction with the primary purpose of providing electricity directly from the generator, which is tethered to the kite, for domestic, industrial & nautical use.

A hybrid kite having an integrated compartment that is inflated with a gas which is lighter than air; the kite is further equipped with a wind turbine generator for the purpose of generating electricity at a high altitude, which can be utilized by the kite or be relayed to the ground for practical use. The kite is anchored in the air as a result of an upward pulling/push force (drag) created by wind, and a combination of buoyancy, to keep the generator/s aloft for an extended period of time beyond 24 hours.

The kite may also serve the purpose of an antenna, to send and receive wireless communication from a base. Moreover the kite can serve as a surveillance vantage point, when equipped with a camera, video camera, microphone and lights, to give an aerial vantage point of a given location.

Numerous other applications for the invention will be realized in conjunction with the primary purpose of providing electricity directly from the generator, which is tethered to the kite, for domestic, industrial & nautical use.

An airtight bladder for kites and method of sealing an airtight bladder for kites. The bladder body has longitudinal edges sealed with a lap seam and ends sealed by a combination of deforming bladder material and applying an end seam. The deforming of the bladder materials is done by folding, rolling, accordion folding, knotting, or twisting the ends. The deforming of the bladder material in this matter shelters and protects the end seals.

An airtight bladder for kites and method of sealing an airtight bladder for kites. The bladder body has longitudinal edges sealed with a lap seam and ends sealed by a combination of deforming bladder material and applying an end seam. The deforming of the bladder materials is done by folding, rolling, accordion folding, knotting, or twisting the ends. The deforming of the bladder material in this matter shelters and protects the end seals.

Kites having an inflatable lifting-body shape with side wings or keels and a horizontal stabilizer or tail to control the angle of attack of the lifting body can be constructed efficiently and economically through a process that builds a laminate of flat sheets, then cuts and joins the sheets to produce an inflatable envelope. Other pieces are affixed to the envelope to produce a finished kite.

The present invention refers to an airborne system (100) and in particular to an airborne power generation system (100). The airborne power generation system (100) comprises an airborne unit (10) configured (i) as an aerial vehicle (10), in particular as a kite or a multicopter, and (ii) to harvest and convert wind power into electrical power, a ground unit (50) configured to send and/or receive electrical power to and from the airborne unit (10), respectively, and a coupling and tether unit (30) for mechanically and electrically coupling the airborne unit (10) to the ground unit (50) and configured to transmit electrical power between the airborne unit (10) and the ground unit (50). The airborne unit (10) comprises a plurality of motor/generator units (12) each of which having a wind harvesting/propelling rotor (14) mechanically coupled thereto and groups (16) of motor/generator units (12) and their assigned electrical transmission paths are electrically and/or galvanically uncoupled, insulated, isolated and/or separated with respect to each other at least in the airborne unit (10) and the coupling and tether unit (30).