AKA: Interim HOTOL. Status: Study 1990. Thrust: 7,840.00 kN (1,762,500 lbf). Gross mass: 250,000 kg (550,000 lb). Unfuelled mass: 33,100 kg (72,900 lb). Specific impulse: 455 s. Specific impulse sea level: 352 s. Burn time: 122 s. Height: 36.45 m (119.58 ft). Diameter: 10.00 m (32.00 ft). Span: 21.60 m (70.80 ft).
Cost $ : 10.000 million. No Engines: 4.