Which impulse class corresponds to a total impulse of 600 Newton-seconds?

Which impulse class corresponds to a total impulse of 600 Newton-seconds?

• A. "H"
• B. "I"
• C. "J"
• D. "K"

Answer: (B)

Total impulse is the total push a motor provides over its burn, measured in Newton-seconds, and motors are grouped into impulse classes by ranges of that total impulse. Each class covers a specific interval. For example, class H spans impulses from 160 to 320 N·s, class I covers from 320 to 640 N·s, and class J covers from 640 to 1280 N·s. So a motor with a total impulse of 600 N·s falls within the range for class I (between 320 and 640). In practice, this classification helps predict performance and ensure the motor is appropriate for a given airframe and safety requirements. If the impulse were higher than 640 N·s, it would move into the next class; if it were lower than 320 N·s, it would be in the previous one.

Total impulse is the total push a motor provides over its burn, measured in Newton-seconds, and motors are grouped into impulse classes by ranges of that total impulse.

Each class covers a specific interval. For example, class H spans impulses from 160 to 320 N·s, class I covers from 320 to 640 N·s, and class J covers from 640 to 1280 N·s. So a motor with a total impulse of 600 N·s falls within the range for class I (between 320 and 640).

In practice, this classification helps predict performance and ensure the motor is appropriate for a given airframe and safety requirements. If the impulse were higher than 640 N·s, it would move into the next class; if it were lower than 320 N·s, it would be in the previous one.