Orpington Astronomical Society

Astronomy => In the Media... => Topic started by: MarkS on Dec 10, 2010, 13:22:03

Title: Lightfoils use light to generate lift
Post by: MarkS on Dec 10, 2010, 13:22:03

Interesting report on "lightfoils".  Whereas aerofoils use air to generate lift, lightfoils use light.  Future spacecraft could potentially "sail" round the solar system.

http://www.bbc.co.uk/news/science-environment-11927793
Title: Re: Lightfoils use light to generate lift
Post by: Rick on Dec 10, 2010, 13:59:26
Interesting, though not exactly a first. ;) The Japanese IKAROS demonstration spacecraft (http://www.jaxa.jp/projects/sat/ikaros/index_e.html) was launched last year. See this thread (http://forum.orpington-astronomy.org.uk/index.php?topic=6129.0), and another mission, a tripple-cubesat called LightSail-1 (http://www.planetary.org/programs/projects/solar_sailing/) is scheduled for launch sometime next year. The solar sail idea is at least as old as Jack Vance's 1962 story Sail 25 (http://www.technovelgy.com/ct/content.asp?Bnum=349).
Title: Re: Lightfoils use light to generate lift
Post by: mickw on Dec 10, 2010, 14:46:35
The design of the "lightfoil" does suggest that it will more maneuverable than a "sail"

It's a similar concept to "rigid wing sails".

Do photons behave the same or similar to air ?  Would there be a "low pressure area" on the leeward side of the foil rather than just a relatively low pressure area ?
Title: Re: Lightfoils use light to generate lift
Post by: The Thing on Dec 10, 2010, 23:11:11
Arthur C Clarke wrote a great short story, ('Sunjammer', alt. 'Wind from the Sun' 1964), about a solar sail race. It's only now we have the technology to make the fabrics and tethers big enough and light enough to attempt to do it.