Size: diameter 400 m, length 1500 m Mass without hydrogen: 1.5x10[sup]11[/sup] kg Hydrogen mass: 6.0x10[sup]10[/sup] kg Acceleration: 50 m/s[sup]2[/sup] Thrust: 7.5x10[sup]12[/sup] N The characteristic velocity: 10 000 km/s The exhaust velocity of hydrogen: 30 000 km/s Hydrogen flow rate: 251 000 k...