
327Linearized Aeroballistics
Problem 11
Modications are made to a 155 mm M483A1 projectile so that it has the following proper-
ties and initial conditions:
C
C
C
C
CC
C
D
L
M
l
MM
M
p
q
p
=
=
=−
+=−
=
1 975
4 573
0 0285
15 2
120
.
.
.
.
.
α
α
α
α
ρρ
=
=
=
=
0 0751
155
2900
537
3
.
[]
.
lbm
ft
mm
ft
s
muzzle
P
d
V
I 11
5753
103
2
2
[]
lbm-in.
lbm-in.
lbm
T
I
m
=
=
At an instant in time after launch when
V
==
=
2
1000
ft
°
determine
a. If the projectile is stable
b. The precessional frequency in Hz
c. The nutational frequency in Hz
Problem 12
What is the minimum spin (Hz) required to stabilize the projectile in Problem 11?
Problem 13
For the projectile given in Chapter 8, Problem 25 ...