The Mk 71 Mods spring-loaded fin (fig. 2-11) deploy
after emerging from the rocket launcher tube. They lock
in place (open) by sliding into a locking slot in the flange
at the aft end of the fin nozzle assembly. When not actually
installed in the launcher, the fins are held in the closed
position by a fin retainer band, which must be removed
when the rocket is installed into the launcher tube.
REVIEW NUMBER 1
Q1. List the two rockets currently used by the Navy.
Q2. If a rocket does not fire when the firing circuit is
energized, it is known as a _________ .
CLOSED - IN LAUNCHER TUBE
Q3.
Q4.
Q5.
Q6.
Q7.
Q8.
Q9.
Q10.
Q11.
Q12.
What is meant by the rockets thrust?
In rocket propulsion, the Venturi nozzle
decreases turbulence of escaping gases and
increases thrust. Gas pressure inside the
container provides about _______, and the
escaping gases provide about ______ to move the
container forward.
List the three components of a rocket.
List the components of rocket motors.
What is the purpose of the inhibitor?
What rocket component is salt coated to prevent
unstable burning of the rocket propellant?
When are rockets most susceptible to
radio-frequency (RF) energy?
Name the type of nozzle installed in the Mk 40
rocket motor.
Explain the difference between the Mk 16 and
Mk 71 rocket motors.
When should you remove the fin retainer band
on a Mk 71 rocket motor?
Warheads
Different tactical requirements demand different
types of rocket warheads be used with airborne rockets.
Warheads are classified as either 2.75 inch or 5.0 inch
warheads. They may be further classified as
PARTIALLY OPEN - LAUNCHED
FULLY OPEN - SPINNING 60 RPS
Figure 2-11.—Mk 71 Mods motor, nozzle, and fin assembly.
high-explosive, flechette, smoke, flare, or practice.
Warheads for 2.75-inch rockets are normally received
with the fuzes installed.
There are many different warheads, fuzes, and
motor combinations available. Therefore, the following
discussion is general.
For specific component
information, you should refer to Airborne Rockets,
NAVAIR 11-85-5.
High-explosive warheads contain high-explosive
material (generally comp-B) surrounded by a metal
case. An internally threaded nose fuze cavity permits
the installation of a nose fuze or an inert nose plug,
depending on tactical requirements. Some warhead
configurations require the use of a base fuze. Base fuzes
are installed at the factory and should never be removed.
High-explosive warheads are painted olive drab and
may have a narrow yellow band around the nose.
There are several types of high-explosive warheads,
and each is designed for a specific type of target.
HE-FRAG WARHEADS.— High-explosive
fragmentation (HE-FRAG) warheads (fig. 2-12) are
2-8
