TABLE 11-2. Classification of Solid Rocket Motors:
Basis of Classification Examples of Classification
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Application See Table 11-1.
Diameter/Length
Propellant 0.005-6.6 m or 0.2-260 in.; 0.025 to 45 m or 1 to 1800 in.
Composite: Heterogeneous (physical) mixture of powdered
metal (fuel), crystalline oxidizer and polymer binder
Double-base: Homogeneous mixture (colloidal) of two
explosives (usually nitroglycerin in nitrocellulose)
Composite-modified double-base: Combines composite and
double-base ingredients
Gas generator and others: See Chapter 12
Case design
Steel monolithic: One-piece steel case
Fiber monolithic: Filament wound (high-strength fibers) with
a plastic matrix
Segmented: Case (usually steel) and grain are in segments
which are transported separately and fastened together at
launch site
Grain configuration
Cylindrical: Cylindrically shaped, usually hollow
End-burning: Solid cylinder propellant grain
Other configurations: See Figs. 11-16 and 11-17
Grain installation
Case-bonded: Adhesion exists between grain and case or
between grain and insulation and case; propellant is
usually cast into the case
Cartridge-loaded: Grain is formed separately from the motor
case and then assembled into case
Explosive hazard
Class 1.3: Catastrophic failure shows evidence of burning
and explosion, not detonation
Class 1.1: Catastrophic failure shows evidence of detonation
Thrust action
Neutral grain: Thrust remains essentially constant during the
burn period
Progressive grain: Thrust increases with time
Regressive grain: Thrust decreases with time
Pulse rocket: Two or more independent thrust pulses or
burning periods
Step-thrust rocket: Usually, two distinct levels of thrust
Toxicity
Toxic and nontoxic exhaust gases
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