One of the bonuses for introducing high thrust motors that hasn't been mentioned before (or I missed it) is safety margin. I can think of cases where someone not knowing any better would have been better off using a high thrust motor instead of a low thrust. The rocket could have been too heavy and or the launch rod too short. I love low thrust long burn motors especially in clusters and upper stages, but I've seen land sharks that could have been prevented with a better motor selection.... another .02, I'm up to .04!

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Quando Omni Flunkus Moritati