Posted by ScottyHOMEy on February 13, 2009 at 11:28:59 from (71.241.192.17):
In Reply to: OT-Balistics question posted by Bill Porter on February 12, 2009 at 20:13:07:
Every object with mass has what is called a terminal velocity. It's the fastest it will travel under the influence of gravity through the air that surrounds it. Propellants can, of course, make it go faster, but when friction overcomes the effect of the propellant, it will settle down to the it terminal velocity.
So anybody that's ever set up a scope or iron sights and played with different loads, knows about setting up their elevation for distance to target. The usual diagram shows an arc, with the gun aimed higher than the target, the slug rising on the arc from the barrel and then falling under the effect of gravity to hit the target.
Question is this. Does a bullet fly straight on a downhill shot as long as the downward velocity of the slug is more than its terminal velocity or does gravity add to the downward velocity immediately?
Picture sittin' on a rock overlookin' a beech grove waitin' for Old Mossyhorns to walk into view. A 500-foot downhill shot over the ground. Your barrel is at 45 degrees below level. The round has a muzzle velocity of 3000 ft/sec, so the bullet leaves the barrel falling/going downhill at about 2000 ft/sec. The slug itself has a terminal velocity of 600 ft/sec. Instead of following the arc of a shot on flat ground, will the bullet fly straight until it slows down to the point that its downward speed is less than the terminal velocity of 600 fps, and to what degree, if at all, does the effect of gravity help the slug maintain its speed or alititude for as long as it exceeds the terminal velocity?
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