ultrasonic dogfights

Hobbyzone make a range of planes that can have an ultrasonic 'Sonic Combat Module' attached that does just as you describe:

http://www.hobbyzonesports.com/Products/Default.aspx?ProdID=HBZ4020

It seems to get good reviews too:

http://www.rcuniverse.com/magazine/article_display.cfm?article_id=392

I'd have thought that a modulated LED would be lighter and cheaper and use less power though.

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