John, this may, or may not, answer your last sentence.
Rick Andrew thinks that Kaman has a patent on a rotor blades control where a swashplate sets the root pitch and his servo-flap sets the 75% of span pitch. He is going to look up his copy of this and send it to me. I could not find anything relevant by doing a patent search on 'Kaman Aerospace' and by reviewing the Kaman folder. September 13, 2002
He came across the article. It was 'CTR Control System', on the Seasprite, in Aviation Week & Space Technology ~ Aug 5, 1968 ~ March 31, 2004
The only relevant meaning for the acronym CTR that I can find is Civil Tilt Rotor.
Very mysterious.
Dave