abstract:Pratt & Whitney Rocketdyne (PWR) was a United States company that designed and produced rocket engines that use liquid propellants. It was a division of Pratt & Whitney, a fully owned subsidiary of United Technologies Corporation.
Theaircraftis a collaborative effort between the U.S.Air ForceResearchLaboratory, the Defense Advanced Research Projects Agency, BoeingandPratt &WhitneyRocketdyne.