The drawbar length standard is really only important for implements that have a fixed shaft down the tongue with a short telescoping shaft with u-joints on either end centered above the hitch pin. With this style of implement the 14 drawbar length ensures that both u-joints are angled equally during turns, thus cancelling out the speed fluctuations that each produces individually.
The problem with pull-type mowers like yours is that essentially all the angle is taken up by the single u-joint at the front. Because there's no equally-angled u-joint to cancel it out you'll end up with vibration and chatter. The best solution for when just a single u-joint gets angled is to use a CV joint.
The longer you make your drawbar the closer to being equal angle your two u-joints will become and in theory it will reduce vibration. However, I doubt you'll notice much improvement without making the drawbar freakishly long at which point other issues like driveline length and overlap will become a problem.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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