Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do cartridge case dimensions affect recoil?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Jimvo" data-source="post: 1610559" data-attributes="member: 109771"><p>CORRECT! Translational Momentum (recoil in a straight line) is just mV. This means that the momentum of a weapon's reaction will exactly equal the momentum of the bullet and powder gasses ejected from the barrel in a straight line. However, the vector that you feel at the shoulder is Force, which is a factor in bullet energy (F x d) where d is barrel length and equivalent to 1/2mV^2.</p><p>Momentum is an intellectual construct that helps physicists understand the interaction of pieces of matter, but it does not exist as a real entity. Moreover, momentum is the result of the mathematical differentiation of the energy equation in any case. </p><p>There is a huge disconnect between the recoil that is predicted mathematically and what actually happens in the real world. Under the simplest conditions, the weight (actually the mass) and the geometry of a weapon are crucial factors in the recoil equation. Weapon mass is inversely proportional to felt recoil. Increase the weapon weight and decrease the recoil from the same round.</p><p>The recoil from the bullet being fired and the propellant gases exiting the muzzle should ideally act directly down the centerline of the barrel. The primary reason for muzzle rise is angular momentum for nearly all firearms. The centerline of the barrel is above the center of contact between the shooter and the firearms' grips or stock. If that line of force is above the center of the shooter's hand, a rotational force causes the firearm to rotate, and the muzzle end to rise upwards. The upward rotation is imparted by the fact that most firearms have the barrel mounted above the center of gravity. Reducing the vertical distance between the barrel and the point of grip and adding more ergonomic contact points, such as a buttstock, can help to reduce muzzle rise. When the Thompson Submachine Gun first entered production as the M1921, its rapid fire and energetic .45 ACP caliber bullets caused it to rise in the extreme in two dimensions when fired in automatic mode. For a right-handed user, the muzzle tended to move up and to the left. Thompson had intended the weapon as an automatic "trench-broom" to sweep enemy troops from the trenches, filling a role for which the Browning Automatic Rifle (M1918 a.k.a. BAR) had been proven ill-suited. In 1926, the Cutts Compensator (a recoil brake) was offered as an option for the M1921 model. The M14 issued in Vietnam initially exhibited a similar problem in full auto mode. (Sorry for being so long -Physics professor for 47 years).</p></blockquote><p></p>
[QUOTE="Jimvo, post: 1610559, member: 109771"] CORRECT! Translational Momentum (recoil in a straight line) is just mV. This means that the momentum of a weapon's reaction will exactly equal the momentum of the bullet and powder gasses ejected from the barrel in a straight line. However, the vector that you feel at the shoulder is Force, which is a factor in bullet energy (F x d) where d is barrel length and equivalent to 1/2mV^2. Momentum is an intellectual construct that helps physicists understand the interaction of pieces of matter, but it does not exist as a real entity. Moreover, momentum is the result of the mathematical differentiation of the energy equation in any case. There is a huge disconnect between the recoil that is predicted mathematically and what actually happens in the real world. Under the simplest conditions, the weight (actually the mass) and the geometry of a weapon are crucial factors in the recoil equation. Weapon mass is inversely proportional to felt recoil. Increase the weapon weight and decrease the recoil from the same round. The recoil from the bullet being fired and the propellant gases exiting the muzzle should ideally act directly down the centerline of the barrel. The primary reason for muzzle rise is angular momentum for nearly all firearms. The centerline of the barrel is above the center of contact between the shooter and the firearms' grips or stock. If that line of force is above the center of the shooter’s hand, a rotational force causes the firearm to rotate, and the muzzle end to rise upwards. The upward rotation is imparted by the fact that most firearms have the barrel mounted above the center of gravity. Reducing the vertical distance between the barrel and the point of grip and adding more ergonomic contact points, such as a buttstock, can help to reduce muzzle rise. When the Thompson Submachine Gun first entered production as the M1921, its rapid fire and energetic .45 ACP caliber bullets caused it to rise in the extreme in two dimensions when fired in automatic mode. For a right-handed user, the muzzle tended to move up and to the left. Thompson had intended the weapon as an automatic "trench-broom" to sweep enemy troops from the trenches, filling a role for which the Browning Automatic Rifle (M1918 a.k.a. BAR) had been proven ill-suited. In 1926, the Cutts Compensator (a recoil brake) was offered as an option for the M1921 model. The M14 issued in Vietnam initially exhibited a similar problem in full auto mode. (Sorry for being so long -Physics professor for 47 years). [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do cartridge case dimensions affect recoil?
Top