TOTAL IMPULSE
Unit = Newton-seconds (N-sec)
This letter indicates the total power the engine produces. Total Impulse is measured in Newton-seconds. One Newton-second is the total impulse produced by one Newton of thrust for a duration of one second. A "B" engine (5 N-sec) can produce up to 5 newtons of thrust for 1 sec, 10 newtons for 1/2 sec or any combination that equals to 5 N-sec. (1N = 0.225 lbs.)
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AVERAGE THRUST
Unit = Newton
This number tells you the Average Thrust of the engine during thrust phase. The actual thrust varies during engine burn. The propellant may burn quickly giving a higher average thrust or burn slowly for a lower average thrust. Generally, higher average thrust is best for heavier rockets, lower average thrust is usually more efficient for smaller, lighter rockets.
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TIME DELAY
Unit = seconds
This number is the number of seconds between the end of the thrust phase and the activation of the ejection charge. The delay allows the rocket to coast to its peak altitude before the recovery system is deployed.
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