Directed Study Free Flight Rockets

Question 1

Warhead FZ 71 Explosive fill

Answer 1

Explosive filling
Composition B (RDX/TNT 60/40)
NEQ 1.05 kg (nominal)

Question 2

Rocket motor 2.75 Inch FZ90 MOD.2/S
Main components

Answer 2

Rocket Motor Tube

RF Igniter Assembly

Propellant Grain

Nozzle and fin Assembly

Question 3

Rocket Motor 2.75 Inch FZ90 Indirect Firing Range

Answer 3

9.18km (indirect firing)

Question 4

WARHEAD, 2.75 INCH, HE FZ 71
Fuze Mk 352 Mod FZ 5

Funtioning

Answer 4

Two Devices lock the rotor in the unarmed position

During initial thrust set back weights in S&A move
rearwards against its spring tension (1 st lock)

Spring loaded second lock rotates on its axis

Lock has an index that locks the rotor out of
alignment

Centrifugal force is used to move the second lock by rotating it and freeing the rotor

Unbalanced rotor is now free to turn under the control of the escapement mechanism

When rotor has moved into the armed position it is lock by the use of an index and the second lock

If set back force or centrifugal force is insufficient to arm the fuze it will move back to the unarmed position and be locked into the unarmed position.

Question 5

Mk 352 Mod FZ 5 PD Fuze with Booster purpose and components

Answer 5

Mk 352 Mod FZ 5 PD Fuze with Booster

Ensures safety in handling and storage and provides a safe separation distance from the aircraft on firing.

Components

Fuze body
Safe and arming device\
Nose cap assy
Booster assembly

Question 6

HEGP arming time

Answer 6

0.7-0.9 secs when subject to both 55g acceleration and 14 Hz spin at same time