Which characteristic does NOT meet the definition of a High Power Rocket Motor?

Which characteristic does NOT meet the definition of a High Power Rocket Motor?

• A. Total impulse is more than 160 Newton-seconds
• B. The motor uses a 'composite' propellant
• C. Average thrust greater than 80 Newtons
• D. Propellant weight greater than 125 grams

Answer: (B)

High power rocket motors are defined by their performance involving energy delivered and how much propellant is used, not by the chemical makeup of the propellant. The thresholds used to identify a high power motor focus on the motor’s total impulse (more than 160 N·s) or on the amount of propellant (more than 125 g). A motor with an average thrust over about 80 N is typically large enough to be in the high power category as well, reflecting that it can sustain a strong push. The key point is that the propellant type—such as being composite—is not part of the definition. Composite propellants are a propellant chemistry, not a size or energy criterion, so simply using a composite propellant does not by itself define a motor as high power.

High power rocket motors are defined by their performance involving energy delivered and how much propellant is used, not by the chemical makeup of the propellant. The thresholds used to identify a high power motor focus on the motor’s total impulse (more than 160 N·s) or on the amount of propellant (more than 125 g). A motor with an average thrust over about 80 N is typically large enough to be in the high power category as well, reflecting that it can sustain a strong push. The key point is that the propellant type—such as being composite—is not part of the definition. Composite propellants are a propellant chemistry, not a size or energy criterion, so simply using a composite propellant does not by itself define a motor as high power.