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An unmanned spinning spy plane that can hover above a location for days gathering intelligence has been developed by US researchers. The prototype vehicle, known as ?the Whirl?, was constructed by them at the US defence and aerospace company Raytheon in Tucson, Arizona. The aircraft has four fixed wings, and each wing has its own propeller on top and it makes the entire craft revolve. The wings also have an upturned manoeuvrable aerofoil at each tip, enabling the craft to maintain a stable hover ? fulfilling a similar function to a helicopter?s rear rotor directing its movement.
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US Airport security officials have unveiled a new scanning device that can detect traces of substances used in making bombs. The prototype machine being tested at the Reagan Washington National Airport is based on existing units that involve a tedious method using cotton swabs, wiping sticks and a testing chamber to detect chemicals that can be used as explosives. The new machine outfitted with a small platform will set off an alarm sniffing at tiny explosive particles which would stay on a person?s hands for long and probably get transferred onto tickets, passports etc.
