Rotating Combustion Engine Evaluation for Low Noise Level Aircraft Applications

摘要

Performance capability of the Rotating Combustion Engine for low noise aircraft applications was investigated. The study compared the fuel-injected RC aircraft engine in both air-cooled and liquid-cooled versions with the objective of attaining low noise levels when installed in propeller-driven aircraft. Engine sizing curves indicate the expected displacement, weight and envelope size for a required horsepower rating in both liquid and air-cooled versions. These show that advanced development liquid-cooled engines can provide smaller and lighter installations compared to the air-cooled engines as a result of both better cooling capability and lower inherent noise levels as tested. Intake and exhaust mufflers as well as a noise reducing enclosure are defined and test program recommendations made. Cooling air blower requirements for the air-cooled version are defined and estimated to need no additional noise treatment.