85mm HVAP-T
Armor Penetration (mm):
180mm (RHA) at 1,000 meters E-Factor =
113mm (RHA, 30°) at 500 meters E-Factor =
AV 48 = 25.4mm RHA.
For each x2 in armor thickness, x2.5 AV
180mm = 2.82 doublings. E-factor = 48 * (2.5^2.82) = 636
113mm = 2.15 doublings. E-factor = 48 * (2.5^2.15) = 344
HEAT-FS
300mm = 3.56 doublings. E-factor = 48 * (2.5^3.56) = 1253
AP-HE
90mm = 1.82 doublings. E-factor = 48 * (2.5^1.82) = 254
Another way of looking at:
"For each x2 in armor thickness, x2.5 AV"
is
Armor thickness varies with 2^(a)
Final armor value = 48*(2.5^(a))
So 180/25.4 is about 7.09, which is 2^(2.82).
Using the scientific calculator in Windows:
- Take the log of 7.09 (~0.851)
- Store in memory
- Take the log of 2 (~0.301)
- divide by what's in memory
- take the reciprocal (1/x) (~2.82)
- use this answer to find AV/E-factor (48*[2.5^2.82])
It's roundabout but accurate...
Rob
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