Velocity and pressure effects on projectiles due to variation of ignition parameters

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Author
Culver, Richard Otis
Burns, Raymond Michael.
Date
1972Advisor
Sinclair, J. E.
Garrettson, G.A
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Show full item recordAbstract
The effect of varying the point of ignition of the powder charge
within a cartridge case was investigated with respect to both pressure
and velocity. By installing a small tube in the base of the cartridge
case it was possible to transfer the primer flash to the forward part
of the case. Ignition of the powder charge at the top instead of the
base gave lower chamber pressures by as much as 6,300 psi and increased
muzzle velocity by 35 ft/s. When additional powder was added to obtain
the same chamber pressure as a conventionally primed cartridge, muzzle
velocities increased by 50 ft/s. When the pressure was brought up past
the original level, but kept within normally accepted limits for the
7.62mm NATO round, velocities increased by 100 ft/s over the original
load. In order to shape the pressure curve, different loading schemes
were tested. Various amounts of powders and powders of different burning
rates were layered within the same case, the slowest burning powder being
ignited first. Lcwer pressures and flatter pressure peaks were realized
from these configurations. The chamber pressure was reduced by 6,000 psi
and the muzzle velocity increased by 100 ft/s.
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