Titan II Stage 1 LR87 and Stage 2 LR91 Engines

STAGE 1 ENGINE

The stage 1 engine developed 430,000 pounds of thrust. That is about the same power as two 747s running at full throttle. Stage 1 burned until it ran out of propellant (about 2 1/2 minutes), then was jettisoned as stage 2 ignited. The engine consumed about 25,000 gallons (96,000 I) of propellant, or about 170 gallons (640 1) per second, boosted the missile to an altitude of about 50 miles (80 km) and propelled it about 50 miles north toward the target.

STAGE-2 ENGINE

Stage 2 burned for about 3 minutes and propelled the missile to an altitude of about 200 miles (320 km). It was shut down at the appropriate time by the on-board guidance system. When stage 2 separated from the missile, the re-entry vehicle (RV), which carried the nuclear weapon, continued on toward the target in a pre-planned ballistic trajectory. The RV was the only part of the missile to actually reach the target

---