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'Silent aircraft'

http://news.bbc.co.uk/2/hi/technology/6120132.stm

The team says any noise from the concept aircraft, known as the SAX-40, would be "imperceptible" beyond the boundaries of an airport. It would also burn far less fuel than conventional planes...

http://news.bbc.co.uk/2/hi/technology/6120132.stm

2006-11-06

airplane silence aviation turbulence aerodynamics

Bladeless desk fan is launched

http://news.bbc.co.uk/newsbeat/hi/technology/newsid_10000000/newsid_10002300/10002357.stm

2009-10-14

aerodynamics fan air

Engineers defend World Cup football amid criticism

http://news.bbc.co.uk/2/hi/science_and_environment/10231975.stm

2010-06-04

football ball sphere aerodynamics speed