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| MODIFIED LANGILE METHOD BALLISTIC LIMIT FIRING |
| 1.VELOCITY DETERMINATION |
1.1 Velocities
Idengtify the lower,upper,and first projectiles.The lower
velocity should produce a partial penetration. The upper velocity
should produce a complete penetration.The first shot velocity
may produce either a partial penetration.
a) The lower velocity should be provided by the NIJ
CTO,if not,the lower velocity limit shall be the highest of the
two NIJ Standard-0101.04 Type ammunition reference
velocities plus 69m/s(225ft/s).
b) The uppper velocity will be determined by adding 46m/s
(150ft/s)to the lower velocity limit.
c) The first shot velocity is the midway point of the loower
and upper velocities. |
| 2.PROCEDURE |
2.1 Firing Sequence
a) Attempt fire the first shot at a velocity midway between
the lower and upper limit velocities.
b) If the first round results in a complete penetration,then
attempt to reduce the velocity of the second shot halfway
between the first round velocity and the lower limit velocity;if a
partial penetration,then attempt to raise the velocity of the
second round halfway between the first shot and the upper limit
velocity.
c) If the first two rounds result in a reversal (one partial,
one complete penetration), attempt to fire the third round
halfway between the velocity of the first two rounds.
d) If the first two rounds result in two partial
penetration,attempt to fire the third round at a velocity halway
between the second round velocity and the upper velocity limit.
e) If the first two rounds result in two complete
penetrations,attempt to fire third round halfway between the
second round velocity and the lower velocity limit.
f) If the preceding pair of rounds results in a reversal(one
partial,one complete penetration),attempt to fire at a velocity
halfway between the two velocities.
g) If the last two rounds did not produce a reversal, look at
four rounds. If the number of partial and complate penetration is
equal,attempt to fire the next round halfway between the
velocity of the first and last round of the group.
h) If the last four rounds did not produce an equal number of
partial and complete penetrations, look at the last six,eight ,
ctc; until the number of partial and compaete penetrations are
equal. Attempt to fire the next round halfway between the lower
and upper velocities of that group.
i) Always attempt to fire at a velocity halfway between the
lower and upper velocity of the group examined.
j) If after 12 shots an equal number of partial and complete
penetration is nit achieved and the last round fired resulted in
a complete penetration,appempt to fire the next round at a
velocity limit ;otherwise if the last round was a partial
penetration,attempt to fire halfway between the last round and
the upper velocity llimit.
k) Complete on in the manner above until the requirement for an
equal number of penetrations has been satisfied,i.e.,at least
five complete penetrations,or until the maximum number of 15
shots has been achieved.
2.2 Lower Velocity Adjustment
In cases where it becomes rapidly obvious that lower
velocity limit is too high or too low,adjustment of the velocity
range can be made by selecting a new lower velocuty limit and
adjusting the upper limit to be 46m/s (150m/s)higher than the
new lower limit. |
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