I had decided to cease pedantry for this thread, and then...
The impulse isn't defined by the letter system. The letter system is defined by the impulse, and the impulse is indicated by the letter system.
Damn my OC tendencies!Those impulse ratings are defined by the letter designation system for each letter grade of motors G motors are only in the range of 80.01 to 160.00 total Ns, irrelevant of the amount of giddy-up (thrust) they produce.
The impulse isn't defined by the letter system. The letter system is defined by the impulse, and the impulse is indicated by the letter system.
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