A small robotic aircraft powered by rotating "paddle-wheel" wings could yet rule the skies, if renewed interest in an antique design bears fruit.
Several international research groups are working on prototype "cyclogyros", a design first proposed more than 100 years ago.
A cyclogyro flies using "cycloidal propellers" – several wings positioned around the edge of a rotating cylindrical framework, a bit like a paddle-wheel. As each wing rotates, its blades move through the air generating lift and thrust.
Link to the Youtube video:
http://www.youtube.com/watch?v=tmMChKqjwBQ
Link to the article in NewScientist:
http://technology.newscientist.com/c...ine-news_rss20
More about the cyclogyro:
http://serve.me.nus.edu.sg/cyclocopter/
RD