Every year or so, some research group posts a video of a "cyclocopter" flying. I'm not sure why (this article suggest they might be more efficient than traditional helicopters, and that people have been pursing them for a century). 

Anyway, here's the latest from a Korean university lab. I wish I could tell you more but their information link is dead. 

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Comment by Craig Fraser on May 23, 2013 at 9:05am

Put it upside down, and I bet it could really rip across the water...

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Comment by Kevin Solar on May 30, 2013 at 11:55am

Just a follow-up I came across while researching a Boeing project...


Cyclorotor Earns Top Honors for 2013 Service Academy Engineering Capstone Project Competition


According to an article at:  http://www.boeing.com/boeing/Features/2013/05/bds_capstone_05_17_13...

“A cyclorotor resembles a paddle wheel, where airfoils serve in place of the paddles. According to Pryor, it is capable of vertical takeoff and landing and can hover like a helicopter, but the design would improve fuel efficiency by 30 percent over current day helicopters and offer significantly higher cruising speeds.”


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