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<blockquote data-quote="Len Backus" data-source="post: 1939" data-attributes="member: 1"><p>What you are calling the "ACTUAL" range is called "slope distance" in rangefinder jargon. Since gravity acts on bullets only at an angle perpendicular to a line drawn through the center of the earth, (or I suppose a line tangent to the surface of the earth, help me here Dave King, you patient, silver-tongued devil) one must figure bullet drop based on the "horizontal" distance to target.</p><p></p><p>The horizontal distance will be less than the slope distance in all cases where the line to the target is not parallel with the lines mentioned in the preceding sentence. In other words, when you aren't pointing the RF parallel with the ground.</p><p></p><p>To understand the gravity "vectors" at work on a bullet in flight, picture yourself with your right arm outstretched parallel with the ground. If I pull on your arm straight down, perpendicular to the ground, and you resist there is a certain amount of force you need to employ in order for your arm to not be pulled downward. </p><p></p><p>Now, if you move your arm upward and point it straight at the target on the hillside I will again pull on your arm, straight down toward the ground. This time you can resist more easily because (though I am still pulling perpendicular to the ground) your arm is at an angle to my direction of pull.</p><p></p><p>In this way gravity doesn't pull as hard down toward the ground on a bullet in flight at an angle, whether upward or downward.</p><p></p><p>Clear as mud???</p><p></p><p>[ 10-13-2003: Message edited by: Len Backus ]</p></blockquote><p></p>
[QUOTE="Len Backus, post: 1939, member: 1"] What you are calling the "ACTUAL" range is called "slope distance" in rangefinder jargon. Since gravity acts on bullets only at an angle perpendicular to a line drawn through the center of the earth, (or I suppose a line tangent to the surface of the earth, help me here Dave King, you patient, silver-tongued devil) one must figure bullet drop based on the "horizontal" distance to target. The horizontal distance will be less than the slope distance in all cases where the line to the target is not parallel with the lines mentioned in the preceding sentence. In other words, when you aren't pointing the RF parallel with the ground. To understand the gravity "vectors" at work on a bullet in flight, picture yourself with your right arm outstretched parallel with the ground. If I pull on your arm straight down, perpendicular to the ground, and you resist there is a certain amount of force you need to employ in order for your arm to not be pulled downward. Now, if you move your arm upward and point it straight at the target on the hillside I will again pull on your arm, straight down toward the ground. This time you can resist more easily because (though I am still pulling perpendicular to the ground) your arm is at an angle to my direction of pull. In this way gravity doesn't pull as hard down toward the ground on a bullet in flight at an angle, whether upward or downward. Clear as mud??? [ 10-13-2003: Message edited by: Len Backus ] [/QUOTE]
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