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terms to understand PC (how's it sensed) [relation to mixture ratio] Isp low level cutoff mixture ratio (+ how its controlled) underspeed (+ implications) engine redlines (+ shutdown cases) launch polynomials (p + y attitudes at given velocity) load relief (eleven + Qa Qb load envelop) Nz ref (feedback which determines whether extra steering is necessary....if it is, extra performance eaten up, traj is depressed) Day of Launch variables: wind, atm, SRB temp, mass loading errors... Single engine roll control