Engineers from NASA and Pratt & Whitney Rocketdyne successfully completed a series of hot-fire altitude tests using liquid methane on the RS-18 engine. The tests, conducted at White Sands test facility in New Mexico, are part of the technology development for NASA's Constellation program, and gathered important data on ignition, performance measurement, and rapid start and stop. Pratt & Whitney Rocketdyne is a United Technologies Corp. (NYSE: UTX - News) company.

The RS-18 engine, which was last used to lift astronauts off the moon's surface 36 years ago, was originally flown with storable hypergolic propellants during the Apollo moon missions. It was later modified to burn liquid oxygen and liquid methane, providing increased safety and performance to future space vehicles.

"We're extremely proud to be part of this history-making milestone," said Terry Lorier, RS-18 program manager, Pratt & Whitney Rocketdyne. "It's tremendously gratifying to know our engine technology is being tested for the NASA Constellation Program. We literally pulled an engine off the museum shelf and were the first to prove that liquid methane could be used on hardware previously rated for storable propellants."

The cryogenic propellant-fueled RS-18 engine was modified under NASA's Exploration Technology Development Program (ETDP), which develops new technologies that will enable NASA to conduct future human exploration missions while reducing mission risk and cost. ETDP's Propulsion and Cryogenic Advanced Development Project, is developing rocket engine and propulsion technologies for future missions to the moon, Mars and beyond.

These propulsion systems would have higher performance than current storable propellant systems and may have the potential to use reactants mined from lunar and Martian environments.

The recent liquid methane tests on the RS-18 demonstrated reliable ignition over a wide range of mixture ratios in vacuum conditions; obtained performance data, chamber pressure data, combustion efficiency and chemical kinetics effects, and combustion stability data; demonstrated rapid engine start and shutdown; and measured specific impulse.

Pratt & Whitney Rocketdyne, Inc., a part of Pratt & Whitney, is a preferred provider of high-value propulsion, power, energy and innovative system solutions used in a wide variety of government and commercial applications, including the main engines for the space shuttle, Atlas and Delta launch vehicles, missile defense systems and advanced hypersonic engines.

Pratt & Whitney is a world leader in the design, manufacture and service of aircraft engines, space propulsion systems and industrial gas turbines. United Technologies, based in Hartford, Conn., is a diversified company providing high technology products and services to the global aerospace and building industries.