![]() For example, if you turn to page 142 of the September 2012 issue, you will see that the 2012 Ross XD set at 29 inches and 65 pounds will shoot a 425-grain arrow 255 fps with 61.38 foot-pounds of kinetic energy. You can see this concept clearly illustrated each month in Bowhunting's High Grade Bow Reports. By going to a lighter arrow, you gain more speed and flatter trajectory with relatively less energy loss. ![]() Because the value for speed is exponential, any changes in speed have a much greater effect on energy than do changes in weight. The reason, without going into too much detail, is that kinetic energy equals mass times velocity squared (K=mv2). And at 100 yards, the crossbow bolt had dropped only 60 inches compared to 240 inches for the compound arrow. At 70 yards, the crossbow bolt was 20 inches low, compared to 120 inches for the compound arrow. The crossbow bolt was only about four inches low at 50 yards while the compound's arrow had dropped to 40 inches. ![]() The trajectory of crossbows and compound bows was similar out to about 25 yards, and then they diverged dramatically. At first glance, the differences appear rather significant. I recently came upon a series of figures distributed by the North American Bowhunting Coalition comparing the trajectory and kinetic energy of modern crossbows and modern compound bows. Tell's choice of weapon was a crossbow! It's understandable how that detail might be overlooked - and at least in this case is of minor importance. But when the story is retold, tellers often err on one minor detail. As punishment for failing to bow in respect to the newly appointed Austrian Vogt, Albrecht Gessler, Tell was commanded to shoot an apple off his son's head. We've all heard the story of William Tell, and most remember the gist of the tale.
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