Note that in the first part of each trajectory, the path of the ball steepens. This is due to the lift created by the spin of the ball. Note as well, that the trajectory of each is different at impact. The 9-iron's impact is the steepest and the Driver's impact is the least steep. Because of this, a Driver's range is more greatly affected by elevation changes than a 5-iron and the 5-iron's is more greatly affected than the 9-iron's. For every yard of fall, the Driver ball travels farther. If on a tee shot, for instance, the ball were to land 20 yards below the tee in elevation, it would travel horizontally 15 yards farther.

The graph above was produced using my projectile model for a 6-iron. The green horizontal lines represent placements of the golf hole's green, relative to the position from which the ball is hit. If the hitting position and green are at the same elevation, the ball lands at about 162 yards.

If hitting uphill to a green elevated by 20 yards, the ball lands on the green at a horizontal distance of about 141 yards. Thus, the effective distance of the 6-iron is 21 yards shorter.

If hitting downhill to a green, 20 yards below, the ball lands ont he green at a horizontal distance of about 180 yards. Thus, the effective distance of the 6-iron is 18 yards longer.

I've used my golf ball trajectory computer model to calculate the actual distances uphill and downhill shots play for all the various clubs. You can instantly download my report along with similar reports that explain how much wind affects your shots and how much slope affects your putts. Get them here. You can order the report on elevation changes here for only $15.99.

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