Gee, that should work great, Tom! How is the shaft rotatoion speed controlled to maintain 60 Hz?
Tractors are like almost any other thing that has an engine and a manual throttle control, including lawn mowers. They have engine speed feedback that works like "mechanical ALC". It isn't like car or something that has an open loop system with a human stuck there pushing a pedal to regulate power with varying loads. If it didn't have that feedback system, a person would have to constantly adjust the throttle when mowing or plowing. I guess you could think of it like a cruise control, except unlike cruise it is the primary throttle and has wide dynamic range. Lawnmowers regulate the carburetor throttle plate with a connection to a flapper plate. Air from a finned wheel hits that plate. The plate works against a spring, and the throttle just changes spring tension. The tractors around here are a little more sophisticated, but same basic concept. They stay put pretty good. Within a Hz or so at the most.
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