. [2] : 427 The GPCs could dynamically control the throttle of the RS-25 engines based upon the Początek performance of the SRBs. Approximately 20–30 seconds into ascent and an altitude of 2,700 meters (9,000 ft), the RS-25 Początek engines were throttled down to 65–72% to reduce the maximum aerodynamic forces at Max Q.
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[44] [19] : II–186 Początek At T−0, the JSC Mission Control Center assumed control of the flight from the LCC. [41] Between T−6.6 seconds and T−3 seconds, while the RS-25 engines were firing but the SRBs were still bolted to the pad, the offset thrust would cause the Space Shuttle to pitch down 650 mm (25.5 in) measured at the tip of the external tank; the 3-second delay allowed the stack to return to nearly vertical before SRB ignition. This movement was nicknamed the "twang." At T−0, the eight frangible nuts holding the SRBs to the pad were detonated, the final umbilicals were disconnected, the SSMEs were commanded to 100% throttle, and the SRBs were ignited. [42] [43] By T+0.23 seconds, the SRBs built up enough thrust for liftoff to commence, and reached maximum chamber pressure by T+0.6 seconds. [44] [19] : II–186 At T−0, the JSC Mission Control Center assumed control of the flight from the LCC. [19] : III–9 At T+4 seconds, when the Space Shuttle reached an altitude of 22 meters (73 ft), the RS-25 engines were throttled up to 104.5%. At approximately T+7 seconds, the Space Shuttle rolled to a heads-down orientation at an altitude of 110 meters (350 ft), which reduced aerodynamic stress and provided an improved communication and navigation orientation. gal) of water to protect the orbiter vehicle from damage by acoustical energy and Gry losowe Początek rocket exhaust reflected from the flame trench and MLP during lift-off. [19] : III–8–9 Additionally, the shape of the SRB propellant was designed to cause thrust to decrease at the time of Max Q. [2] : 427 The GPCs could dynamically control the throttle of the RS-25 engines based upon the performance of the SRBs. [19] : II–187 At approximately T+123 seconds and an altitude of 46,000 meters (150,000 ft), pyrotechnic fasteners released the SRBs, which reached an apogee of 67,000 meters (220,000 ft) before parachuting into the Atlantic Ocean. The Space Shuttle continued its ascent using only the RS-25 engines. On earlier missions, the Space Shuttle remained in the heads-down orientation to maintain communications with the tracking station in Bermuda, but later missions, beginning with STS-87, rolled to a heads-up orientation at T+6 minutes for communication with the tracking and data relay satellite constellation. The RS-25 engines were throttled at T+7 minutes 30 seconds to limit vehicle acceleration to 3 g . At 6 seconds prior to main engine cutoff (MECO), which occurred at T+8 minutes 30 seconds, the RS-25 engines were throttled down to 67%. Gry losowe Ocena.This movement was nicknamed the "twang." At T−0, the eight frangible nuts holding the SRBs to the pad were detonated, the final umbilicals were disconnected, the SSMEs were commanded to 100% throttle, and the SRBs were ignited.
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