We want our players to assume that the half-wheel will revolve clockwise and counter-clockwise, but the defenders must always remain at their points at the end of the spokes keeping the same relative distance from each other in order for the defense to be sound. If the offensive team runs to their left, the wheel should revolve to our right, counter-clockwise, as illustrated in [Figure 47]. It would be just the opposite if the play were run to our left—revolve clockwise. If it were a running play up-the-middle, the spokes of the wheel would be shortened as the defensive men would converge on the ball carrier, keeping their same proportionate relationship to each other.
Figure 47
[Figure 48] illustrates a vulnerable area in the defensive secondary as the result of the safety man being out of position versus a back up pass. His course should be straight back, covering the deep middle zone, so that he is approximately equidistant from his halfbacks. Should the error occur, as illustrated in [Figure 48], our pass defense will not be sound.
Figure 48
The length of the spokes will be determined by the distance of the defenders from the passer. As an example, if the passer goes back to throw off of a drop back action, the spokes would stretch proportionately. The defenders would have time to cover more distance if the passer is attempting to throw deep because the ball must remain in the air longer in order to reach its receiver. Conversely, if the passer attempts to throw a quick pass from only a yard or so off the line of scrimmage, the receivers will not have time to get deep, consequently the length of the spokes will not be lengthened but will be shortened proportionately as the defenders converge on the ball as it is thrown.
[Figure 49] illustrates the initial depth and width of the ends and the 3-deep secondary in the 5-spoke defensive alignment when the ball is in the middle of the field between the hash marks.