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Originally Posted by shdw  Tgray: does that graph on the left take into account engine propeller efficiency? |
No. BHP never takes into account propeller efficiency, only THP does that. I would expect that propeller efficiency would be variable all along the x-axis on both charts. For the right one, as you reduce MP, you're reducing torque; how else can the governor maintain RPM other than by reducing the blade angle and hence changing efficiency?