I believe the 9700 had a 31.5" rotor, though I thought it was a little longer, say, about 168"IJ We had both the Massey and White prototypes in our neighbourhood back in the 70's; - both VERY similar machines. The Massey was earmarked the "TX903", and it's prototype boasted (besides massive capacity) about 10 to 12 gallons of hydraulic oil leaks per day of operation. It was comical to watch those engineers at work; - oil leaks, misaligned belts and malfunctioning electronics meant NOTHING so long as the basic machine worked.