Intro to FFR Flashcards
1
Q
FFR Rockets are made up of two main sections and one other, what are they?
A
- Warhead (including fuze)
- Motor
- The launcher
2
Q
List four characteristics of FFR
A
- Only use boost motors
- Motor casing must be strong enough to withstand the pressure and temperature of combustions
- Usually made of various steels, although has been made from glass reinforced plastic
- De Lavel Nozzels usually used
3
Q
What are the types of warheads that can be fitted to an FFR?
A
- Nuclear
- HE
- Chemical
- Preformed fragments
- Sub munitions
- Terminally guided munitions
4
Q
What are the factors that effect the accuracy of FFRs?
A
- Surface cross winds
- Propellant burning rates
- Launcher induced errors
5
Q
What is the main type of propellant used in FFR’s?
A
Solid propellant
6
Q
What does a rocket motor consist of?
A
- Casing
- Combustion chamber
- Propellant
- Igniter
- Fins
- Nozzle
7
Q
Solid propellants are preferred because of their:
A
Reliability and simplicity
8
Q
In a De Lavel Nozzle, High Pressure ___
A
Sub sonic gas is transferred into low pressure super sonic gas
9
Q
What does spin combined with fin in FFR achieve?
A
It offsets the effect of Thrust Misalignment as well as forces produced in fin misalignment
10
Q
4 ways of overcoming thrust misalignment
A
- Manufacturing to closer tolerances
- Impart a slower spin rate
- Reduced rocket motor burning time
- Addition of fins
