Variable-pitch propellers date way back to the 1930's and even earlier. I would like to know, what kind of controls they used? Some kind of lever or crank? How heavy were these controls? I'm thinking of the drag the propeller has, since even near landing, the prop could be spinning very fast and would be resistant to changing it's pitch.
I'm interested in the old days, before modern electrical control by wire.
Note: I am not asking how the variable-pitch mechanisms work. I might ask that in a separate question.