Steady State Operation

Integrating propulsion system with vehicle for steady state operation is the easiest part.

Interactions:
1. propellant utilization
  - burning at correct rate
  - burning at correct pressure
2. Temperature

During steady state operation, adjust mixture to burn down Ox and fuel. 
At start, bias engine to burn Qx rich - 6:1 instead of 5.5:1. This burns the heavier 
propellant first. First part of flight (100 sec) burns rich.

Computer - controlled motor on vehicle then adjusts by calculating levels in tanks to 
deplete both simultaneously.

Some missions for the Air Force and 3 firings.

Preflight predictions of needs are compared with known tankage capacities.