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Solid rocket motors have a fairly standardized labeling system. On the casing (or reload) itself there is a three-part code which denotes what the total impulse range is, the average thrust, and the delay grain length. All these numbers are in standard metric units.
 
Solid rocket motors have a fairly standardized labeling system. On the casing (or reload) itself there is a three-part code which denotes what the total impulse range is, the average thrust, and the delay grain length. All these numbers are in standard metric units.
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The letter designation represents the total impulse. Each letter category represents double the total impulse of the previous letter category.
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[[File:L1_Guide_Motor_Classification.png|300px|thumb|frame|center|Letter designations increase total impulse exponentially]]
    
=== Aerotech H550ST-14A ===
 
=== Aerotech H550ST-14A ===