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Kite aspect ratio / Wind games

Kite aspect ratio

July 19, 2017
Some photos of the Ozone R1 6M

The current system demonstrator uses a single kite. The properties of an energy producing kite include: A high lift to drag ratio to optimize power production, ability to fly at a low angle of attack to minimize power consumption during the reel in phase, structural capacity to carry high loads for high reel out tension and for withstanding gust loads.

Mutiny 25m2 V2

Different kites have been flown on the system. The kite that is used most frequently is a 25m2 Supported Leading Edge Tube Kite. The kite was designed specifically for the Laddermill project by Henry Rebbeck, designer of Mutiny kites. The kite meets all requirements for delivering power to the groundstation and has shown to be able to deliver over 6 kW avarage power over a full cycle and 13 kW avarage power during the reel out phase.

General Properties

Foilkite 10m2 with rack-and-pinion kite control unit

Flat Area (simple)

25 m2

Projected Area

16.7 m2

Flat Aspect Ratio (simple)

4.6

Projected Aspect Ratio

2.7

Number of Struts

Maximum allowed load

5500 N

Mass (incl. bridle)

11.49 kg

Table 1: General properties of the 25m2 V2 Mutiny kite

Foilkite with 10m2 surface area and a rack-and pinion control unit

Foilkite 10m2 with rack-and-pinion kite control unit Foilkite 10m2 with rack-and-pinion kite control unit Two stacked foilkites 10m2 in tandem flight on a cable actuator control pod Foilkite 50m2 launched
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