Firstly, I'd like to say thank you to all for the hard work and dedication it took to provide this forum to enthusiasts of rotorcraft. I have no background in aviation or engineering, however I hope to make a contribution to the forum by engaging in meaningful dialogue that may spark someones imagination a bit. This being said, the topics I will be engaged in will primarily focus on the Keller Pressure Jet design and prototyping. I learned many concepts specific to helicopter aviation from Mr. Keller such as, lead/lag, flapping hinges, retreating blade stall speed. rotating gas-sealed bearings. Sadly, Merrill Manson Keller passed away in December of 2012. He was a veteran of the air force, a visionary engineer and friend who designed and patented what he and I and others believe to be a big part of the future of helicopter aviation. His humanitarian contribution would be this design in an effort to eliminate tail rotor tragedies. I have read only a few of the forum posts and already recognize a couple of the names from other rotor forums who post interesting and educational information and look forward to reading more.
Welcome to the forum, Kellerfan! Hope you enjoy it here!