ArmySGT wrote:
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Anybody know by what formula as the normal one would not apply for a shape charged weapon.
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E-factor is derived from penetration of armor steel (cm).
There isn't a simple formula. The curve for steel using the table on p.38 is not continuous (plot it in Excel and see).
Only wood has a linear relation between thickness and armor value.
As an approximation for steel:
For each x10 in thickness, x20 armor value.
For each x2 in thickness, x2.5 armor value.
The M72 LAW has a penetration of 28cm or 11".
This gives you an E-factor of about 1100 (1185).
AV 48 = 2.54cm (1") steel.
11" is 11x thicker or ~3.5 doublings.
Final AV = 48 * (2.5^3.5) or about 1185.
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Next any Idea how they came up with the DPW for the manufactured weapons like the LAW.
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Estimate mass and composition of explosive filler and use the equation Gary posted earlier.
A small simplification:
DPW = 2309 x RE x explosive mass, kg
(1300/0.563 = 2309)
For DPW 533, I get about 270g of RDX (using 0.85 value in TM1-1) which fits
pretty well with the M72 rocket.