I was going through a stack of old Machine Design magazines and saw this.

Perry


Wow!!! Boeing is on to it.
Great minds work in similar ways :)
Thanks Perry. This will put the V22 Osprey further ahead than
it is already.

Here are some more web sites I found on the subject.
http://www.unicopter.com/1101.html
http://www.google.com/search?hl=en&q=Boeing+variable+twist+rotors&btnG=Search
http://www.mmc.net.ge/gen/sum25.htm