[ViggoG]

A few Cents worth on common sense Internal ballistics .


One must first consider the forces that we call recoil , This is the force that open the breech on PO-8"s !


The average of a large number of Instanteanious internal

breech pressures times the difference between the largest

internal cartridge area -- and the internal area of the barrel

This multiplied by the time required for the projectile to

transit the barrel.

This is the accelerating force on the moveable barrel and breech assembly

This time force value acted on by the recoil spring determines the time and distance available to traverse the

full length of the magazine , eject the empty case, strike the buffer or stop, now accelerated by the recoil spring, return to chamber another round .


A balance of all of these forces and motions must be both

made and considered in the case of any malfunction .

Failure to do so results in arriving a working combination through pure guesswork and luck, experience is also usefull .


The weight of the Projectile bears only on the acceleration portion of the problem Via of the changes it makes in the time of transit and only through this will projectile mass effect the recoil force on the breech.


The complex forces entered into the formula by the toggle linkage so complicates the problem that it confuses all but the best of Ballistic Analyists


Just a thought to consider .

I hope it produces enough mud to make the un-inniated

THINK, THINK, THINK !!!!!


ViggoG