Ramjet Boost for Helicopters

From Summary: The problem of supplying additional power to a helicopter rotor for take-off or hovering under overload, hot-day, or altitude conditions is discussed briefly, and the boost system requirements are defined qualitatively. The Marquardt Aircraft Co. is in the process of developing a novel ramjet engine to meet these requirements under the sponsorship of the United States Air Force, The progress to date is reviewed, and the eventual application of this engine is discussed.