
538 Ballistics: Theory and Design of Guns and Ammunition
and
P
ml
A
ml
l
m
===
jj
tj
jj
tj
j
j
V
V
ρρ ρ
2
(18.60)
If we include the effects of standoff, we can write
Pl s
m
=+
0
1()
α
j
V
ρ
(18.61)
This states that P varies linearly with s or, mathematically
(18.62)
This behavior is shown graphically in Figure 18.8.
If we assume the jet particulates, then the cross-sectional area of the jet is a constant and
λ = 2. Then Equation 18.57 can be written as
P
ml
A
=
2
jj
ρ
(18.63)
If we include the effects of standoff, we can write
P
ml s
A
j
=
+21
0
α
ρ
tj
(18.64)
This states that P varies with the square root of (1 + αs) or, mathematically
(18.65)
This behavior is ...