What does the '5' in the motor designation H100-5 stand for?

What does the '5' in the motor designation H100-5 stand for?

• A. It is the rocket motor burn time
• B. It is the peak thrust (in kilograms) of the rocket motor
• C. It is the average thrust of the rocket motor
• D. It is the ejection charge delay time

Answer: (D)

The trailing number is the ejection delay, measured in seconds, between burnout and the ejection charge firing. In H100-5, the 5 means there is a 5-second delay before the parachute ejection occurs. This timing lets the rocket coast toward the apex of its flight before the parachute deploys, rather than deploying during powered ascent. The other parts of the designation encode the motor’s impulse class and total impulse, not the delay.

The trailing number is the ejection delay, measured in seconds, between burnout and the ejection charge firing. In H100-5, the 5 means there is a 5-second delay before the parachute ejection occurs. This timing lets the rocket coast toward the apex of its flight before the parachute deploys, rather than deploying during powered ascent. The other parts of the designation encode the motor’s impulse class and total impulse, not the delay.