The Zephyr holds the official endurance record for an unmanned aerial vehicle for its flight from 9 July to 23 July 2010, lasting 336 hours and 22 minutes (2 weeks / 14 days). Record claims have been verified by the Fédération Aéronautique Internationale (FAI) for both duration and altitude, at 21,562 meters. It more than doubled the previous endurance record for unmanned flight.
In a 2008 demonstration for the US military, a smaller-scale version of the Zephyr performed beyond the official world record for the longest-duration unmanned flight, however its 82-hour flight at an altitude of 61,000 feet did not set an official record because FAI officials were not involved in the flight.
It is of carbon-fibre construction, and uses sunlight to charge a lithium-sulphur battery during the day, which powers the aircraft at night. The aircraft has been designed for use in observation and communications relay.
The vehicle can circle over a particular area for extended periods. The military uses the vehicle for reconnaissance and communications platforms. Civilian and scientific programmes use it for Earth observation. During the day, Zephyr uses its state-of-the-art solar cells spread across its wings to recharge high-power lithium-sulphur batteries and drive two propellers. At night, the energy stored in the batteries is sufficient to maintain Zephyr in the sky. The lithium sulphur batteries are supplied by Sion, and the first version had a battery capacity of 3kWh.
The second version of the vehicle is bigger and takes five individuals to launch, as opposed to the three previously. The team runs gently into the wind until it lifts out of their hands.
- Crew: none
- Payload: 2.5 kg (5 lb)
- Length: ()
- Wingspan: 22.5 m (73 ft 10 in)
- Height: ()
- Loaded weight: 53 kg (116.8 lb)
- Powerplant: 2 × Newcastle University custom permanent-magnet synchronous motor, () each
- Service ceiling: exceeds 21 km (70,000 ft)
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