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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: 29309" data-attributes="member: 3"><p>Hell, I think I want in on this one!</p><p></p><p> As I understand it... in the Norhtern hemisphere Coriolis deflects to the right and it deflects to the left in the southern hemisphere. I find this easiest to understand as when viewed from a downward view above the North Pole... the Earth spins counter-clockwise BUT when this downward view is from above the South Pole the Earth is spinning clockwise.... the Earth spins in opposite directions when comparing North and South hemispheres.</p><p></p><p> Deflection from Coriolis as I understand it is due to the projectile traveling at the Earth surface speed at it's flight origin and retaining this induced speed as it travels to another part of the earth that may very well have a different surface speed.</p><p></p><p></p><p> For a quick set of numbers (in a special environment, no drag) and an example.... earth nominally 60 miles per degree at the equator, 360 degrees in a circle.....21,600 miles for one revolution...24 hours per rev = 900 mph surface speed at the equator. Shoot a round north or south with a 900 mph origin speed and have it fly for a minute at 5280 fps (one mile per second). In that time it will have flown 1 degree (60 miles) north. At this distance from the equator the earth (our example earth) is only 21,223 mile around so it's surface speed is 884 mph.... Our projectile has an origin speed of 900 mph and when it arrives on degree north it's at a spot that is moving slower that the origin by 6 mph or 8.5 feet per second, with a flight time of 60 seconds * 8.5 FPS we should have a displacement of about 510 feet to the east of the intended target (an arc to the right in the north hemisphere and an arc to the left in the south hemishpere).</p></blockquote><p></p>
[QUOTE="Dave King, post: 29309, member: 3"] Hell, I think I want in on this one! As I understand it... in the Norhtern hemisphere Coriolis deflects to the right and it deflects to the left in the southern hemisphere. I find this easiest to understand as when viewed from a downward view above the North Pole... the Earth spins counter-clockwise BUT when this downward view is from above the South Pole the Earth is spinning clockwise.... the Earth spins in opposite directions when comparing North and South hemispheres. Deflection from Coriolis as I understand it is due to the projectile traveling at the Earth surface speed at it's flight origin and retaining this induced speed as it travels to another part of the earth that may very well have a different surface speed. For a quick set of numbers (in a special environment, no drag) and an example.... earth nominally 60 miles per degree at the equator, 360 degrees in a circle.....21,600 miles for one revolution...24 hours per rev = 900 mph surface speed at the equator. Shoot a round north or south with a 900 mph origin speed and have it fly for a minute at 5280 fps (one mile per second). In that time it will have flown 1 degree (60 miles) north. At this distance from the equator the earth (our example earth) is only 21,223 mile around so it's surface speed is 884 mph.... Our projectile has an origin speed of 900 mph and when it arrives on degree north it's at a spot that is moving slower that the origin by 6 mph or 8.5 feet per second, with a flight time of 60 seconds * 8.5 FPS we should have a displacement of about 510 feet to the east of the intended target (an arc to the right in the north hemisphere and an arc to the left in the south hemishpere). [/QUOTE]
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Coriolis effect
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