As usual, BD is right on...
The standard procedure around here was to get the Hot Rod kid who was interested in speed above all else, put him on a tractor with the M & W added gearing [stepped up the std IH first four gears by about 1.6X or so] show him where the fastest gear was that would pull the hoe, and then leave the field.
That was one place where the 'pop-pop' John Deeres had an advantge, wiht their fifth gear that was considerably faster than the IH 4th and yet had more pulling muscle than the 5th [road] gear of the IH 'H' or 'M'.
The hand clutch on the JD was something of a challenge for a boy that was raised in 'RED' tho...
Later, when the rotary hoe was mounted on a three-point, they did put shields on behind the driver. The old pull-type hoes I saw, however did not have such a shield.