Efficient operation of a hybrid-electric propulsion system (HEPS)
powering a small remotely-piloted aircraft (RPA) requires that a
controller have accurate and detailed engine and electric motor
performance data. Many small internal combustion engines (ICEs)
currently used on various small RPA were designed for use by the
recreational hobbyist radio-control (R/C) aircraft market. Often,
the manufacturers of these engines do not make accurate and
reliable detailed engine performance data available for their
engines. A dynamometer testing stand was assembled to test various
small ICEs. These engines were tested with automotive unleaded
gasoline (the manufacturer's recommended fuel) using the
dynamometer setup. Torque, engine speed and fuel flow measurements
were taken at varying load and throttle settings. Power and
specific fuel consumption (SFC) data were calculated from these
measurements. Engine performance maps were generated in which
contours of SFC were mapped on a mean effective pressure (MEP)
versus engine speed plot. These performance maps are to be utilized
for performance testing of the controller and integrated HEPS in
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