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Technical Paper

Two-Stroke Engine Mapping with Aerospace Testing Standard AS6971

Small two-stroke engine performance reports between manufacturers and third party tests have unexplained discrepancies. The impact of different testing conditions on performance metrics provides reason for a universally accepted engine testing standard that applies specifically for engines used in Unmanned Aerial Vehicles (UAVs). The Society of Automotive Engineers (SAE) has proposed an aerospace engine testing standard, AS6971, as a solution to engine testing discrepancies. The work presented here is the first implementation of the AS6971 draft standard to a port fuel injected 60.5 cc two-stroke spark ignited engine as feedback to the SAE standards. The engine was tested across 2000 RPM - 5000 RPM with settings that maximized torque output and compared to the manufacturer's performance results. The difference in these results further demonstrate the need for an accepted testing standard between both manufacturers and third party engine testing groups.