What does the designation I220-8 indicate about a high power rocket motor?

The designation I220-8 in high power rocketry refers to the motor's characteristics in terms of specific impulse and thrust. The "I" indicates that it is an impulse motor, while the "220" signifies that the average thrust produced by the motor is 220 Newtons. The "8" represents the total impulse of the motor, which falls within the range of 320 to 640 Newton-seconds (N-s).

This designation means that the motor's total impulse is reflective of the cumulative thrust produced over its burn duration, suggesting it is a mid-range motor suitable for a variety of high power rocketry applications. When choosing a motor, understanding both the thrust and total impulse is crucial for calculating rocket performance, flight profiles, and ensuring that the rocket meets mission requirements. The specifics provided in the choice align closely with the standard conventions used in the rocketry community for labeling motor characteristics.