Boeing's Rocketdyne division is designing a reusable rocket engine that uses oxygen-rich gases and kerosene, and generates over 1 million lb-thrust (4,450kN). The RS-84 is being developed with $34 million from NASA's Space Launch Initiative (SLI). A prototype could be assembled by 2006. The 100-mission lifetime engine derives from studies on reusable Space Shuttle fly-back boosters. Boeing is also working on a $62.7 million SLI-funded RS-83 hydrogen fuel-rich stage combustion engine.

Source: Flight International