Velocity, muzzle

Muzzle velocity (MV) is defined as the velocity at which a projectile leaves the muzzle of a gun. MV is considered to be the maximum velocity of a projectile when it emerges from the bore. As it is very difficult to determine the velocity close to the muzzle, the usual practice is to measure it at a short distance from the muzzle, 

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Weight. The projectile weight must be compatible with the desired muzzle velocity. The greatest challenge is usually to make the projectile as light as possible to achieve a maximum impact velocity, yet meet other criteria such as tilt and integrity. 

Muzzle Velocity (MV, Initial Velocity). The velocity at which a projectile leaves the muzzle of a gun, expressed either in m/sec or ft/sec. The moment the projectile emerges from the bore, its velocity starts to decrease because of air resistance. For this reason, the muzzle velocity is considered as the max velocity of a... 

Muzzle velocities may either be calcd by means of equations, such as that of LeDuc (Ref 1, p 74) or detd experimentally thru use of chronographs (Refs 4 5)... 

These propints gave very satisfactory performance. They developed a muzzle velocity of 1640 ft/sec and a press of 1750 atm, when used in 84cm field guns with a 600g charge and a 6.7kg projectile. In the 7.5mm rifle, with a 2g charge and a I3.8g bullet, a muzzle velocity of 2035 ft/sec and a press of 2200 atm were attained Refs 1) P.G. Sanford, Nitroexplosives , London (1896), 186-7 2) Daniel (1902), 584... 

It fired an 18-inch finned projectile weighing 6 lbs at a muzzle velocity of 1700 fps to an effective range of 700 meters. The projectile penetrated 140mm of armor at a 60° angle of impact... 

Computed Maximum Pressure (CMP). Value of max pressure computed by means of interior ballistic formulas. It will be developed when a new gun of a particular type is fired under standard conditions with a propelling charge which will give to the projectile its rated muzzle velocity Rated Maximum Pressure (RMP). Value of max pressure specified in the proplnt specifications as the upper limit of avg pressure which may be developed by an acceptable proplnt in the form of propelling charges which will impart the specified muzzle velocity to the specified projectile. Normally about 2000psi.above the computed max pressure, subject to determination at the time of development... 

Rated Maximum Pressure (RMP). The gas pressure which should not be exceeded by the avg of the max pressures developed by a group of firings which will impart the specified muzzle velocity to the specified projectile. If the RMP... 

This equation can be derived from the laws of physics, in which case the parameteers a and b can be related to such factors as the muzzle velocity, projectile mass, angle of inclination of the gun, and wind resistance. The equation may also be empirical if measured values of z versus x are related by an equation of this form, with no reference to the laws of physics. 

Muzzle Velocity of the Shell. A further equation based on gun ballistics has been proposed that allows an estimation to be made of the muzzle velocity of a shell [equation (4.6)],... 

Substituting appropriate values into equation (4.6) gives the muzzle velocity of the shell as in equation (4.7) ... 

We must now turn to ballistics tables such as Table 4.2 to determine the ratio of altitude muzzle velocity squared. 

From Table 4.2 it can be seen that a value of x of 2.40 corresponds to a HjVi ratio of 0.0169. Knowing the muzzle velocity of the shell (127 ms ) enables an estimate of the maximum altitude to be made as in equation (4.13) ... 

In the case of a 75 mm star shell, fired by a 13 g lifting charge to give a muzzle velocity of 105 ms as listed in Table 4.3, the kinetic energy (KE) of the shell is given by equation (4.20). 

Muzzle Velocity Determination. See Initial (or Muzzle) Velocity of Projectiles... 

Length of complete round with fuze 34.15 inches, maximum muzzle velocity 1700-1800fps and max range 328 yds (300 meters). Its propellant chge consists of 3.1 lb of proplnt M30A1, which is a modification of triple-base proplnt M30 listed in Vol 2 of Encycl (Ref 48) p C34, Table V (Ref 52 and its Appendix, pp 2-112 2-113) Ammunition for 37-mm to 105-mm inclusive is either "fixed" or "semi-fixed (See Ref 43, p A385-L). Ammunition of larger caliber can be either "separated"(such as... 

The burning illuminant produces approximately 1,000,000 candlepower for 120 seconds. Length of fuzed projectile is 23.79 inches muzzle velocity and max range are the same as for M118A2 (Ref 52, pp 2-138 to 2-140)... 

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