Redesigned SRM
Engine · USA
Original archive entry. The text, images and links below are kept as they were written.
Thiokol solid rocket engine. In Production. Replacement shuttle solid rocket booster with redesigned field joints to prevent failure that caused the Challenger disaster.
Mass: 569,893 kg. Length: 38.47 m. Diameter: 3847 mm. Propellant Type: TP-H1148 HB Polymer, 16% Al, and 70% AP. Propellant Shape: 11-point star forward with a double taper cylinder . Propellant Mass Fraction: 0.883 (503,487 kg). Burn Time: 123.6 sec action, 111.7 sec web. Thrust: 11.52 MN average vacuum, and 14.77 MN maximum vacuum. Isp: 268.6 sec vacuum. Itotal: 296.3 MNs vacuum. Pressure: 62.4 atm maximum (MEOP 69.1) and 45 atm average. Nozzle Throat Diameter: 136.8 cm. Nozzle Length: 454 cm. Nozzle Exit Diameter: 380.1 cm (expansion ratio 7.72). Nozzle Materials: D6AC steel for fixed housing with throat and forward exit cone housings. aluminum for nose inlet and aft exit cone housing. Casing Materials: D6AC steel with 1.165 cm minimum thickness. Igniter: forward end internally mounted 62.1 kg of TP-H1178 case-bonded 40-point star.
Chamber Pressure: 46.00 bar. Area Ratio: 7.72. Propellant Formulation: PBAN.