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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Coriolis effect
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<blockquote data-quote="Dave King" data-source="post: 29312" data-attributes="member: 3"><p>As I understand it... After all, I'm not a rocket scientist <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />.</p><p></p><p></p><p>Okay, northern hemisphere only. Shots will always be deflected to the right in varying amounts with the exception of a shot EXACTLY due east or west. The amount of the deflection is dependant upon origin and target surface speed and the projectile time of flight. We're in essence shooting at a moving target from a moving position... the target is always moving east and the origin position is always moving east...when the speed of the two positions match there is zero deflection.</p><p></p><p>Shots fired at intevals of the hours on a clock face... 12:00 being due north toward the geographic pole, 3:00 due east, 6:00 due south and 9:00 due west.</p><p></p><p>Shot fired due north...greater surface speed at origin than at target position... projectile if deflected to the right (east) as seen by the shooter (due north and south have the greatest deflection for this effect). Repeat at 1:00...same shot angle and resultant distance travel but less eastward (right as viewed by the shooter) deflection because the target location is a nearer the same surface speed.... Repeat at 2:00 position and again lesser eastward deflection (right as viewed by shooter) as the target and origin surface speeds are closer. Shoot at 3:00, same origin and target surface speed so no deflection... note that in theory the target can only be EXACTLY due east. Now we swing to the 4:00 position and shoot toward the south east....the origin surface speed is LESS than the target surface speed so the projectile is deflect to the west of the target (to the right as viewed by the shooter). Swing to 5:00 and again the projectile is deflected to the west (the right as viewed by the shooter) but to more extent than a 4:00 position shot. Shoot at 6:00 position and the effect is the greatest again and the projectile is delected to the west (the right again).</p><p></p><p>The due east and due west "no deflection" zones are only possible if the origin and target are on exactly the same latitude. A pretty skinny possibility for a shot at a distance of 60 miles as in my previous example.</p></blockquote><p></p>
[QUOTE="Dave King, post: 29312, member: 3"] As I understand it... After all, I'm not a rocket scientist [img]images/icons/smile.gif[/img]. Okay, northern hemisphere only. Shots will always be deflected to the right in varying amounts with the exception of a shot EXACTLY due east or west. The amount of the deflection is dependant upon origin and target surface speed and the projectile time of flight. We're in essence shooting at a moving target from a moving position... the target is always moving east and the origin position is always moving east...when the speed of the two positions match there is zero deflection. Shots fired at intevals of the hours on a clock face... 12:00 being due north toward the geographic pole, 3:00 due east, 6:00 due south and 9:00 due west. Shot fired due north...greater surface speed at origin than at target position... projectile if deflected to the right (east) as seen by the shooter (due north and south have the greatest deflection for this effect). Repeat at 1:00...same shot angle and resultant distance travel but less eastward (right as viewed by the shooter) deflection because the target location is a nearer the same surface speed.... Repeat at 2:00 position and again lesser eastward deflection (right as viewed by shooter) as the target and origin surface speeds are closer. Shoot at 3:00, same origin and target surface speed so no deflection... note that in theory the target can only be EXACTLY due east. Now we swing to the 4:00 position and shoot toward the south east....the origin surface speed is LESS than the target surface speed so the projectile is deflect to the west of the target (to the right as viewed by the shooter). Swing to 5:00 and again the projectile is deflected to the west (the right as viewed by the shooter) but to more extent than a 4:00 position shot. Shoot at 6:00 position and the effect is the greatest again and the projectile is delected to the west (the right again). The due east and due west "no deflection" zones are only possible if the origin and target are on exactly the same latitude. A pretty skinny possibility for a shot at a distance of 60 miles as in my previous example. [/QUOTE]
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