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This paper provides comparative test results for a brushless starter generator versus a brushed starter generator of equivalent nameplate rating. Key starter generator performance characteristics are measured by test and compared for each type of starter generator. These comparative performance parameters include: Generator output voltage versus load current versus drive speed Generator maximum output power capability versus drive speed Self excitation start-up capability (with no external source of control power) Efficiency during generate operation Efficiency during start operation Performance for high transient load applications Power quality, including ripple voltage and noise on the 28VDC bus Gear box torque induced stress during engine start Short circuit and over-load protection System weight Overhung moment for starter generator unit