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?
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
