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On a normally aspirated aero-engine fitted with a fixed pitch propeller:
  • A
    manifold pressure decreases as the aeroplane climbs at a fixed throttle setting.
  • B
    in a descent at a fixed throttle setting manifold pressure will always remain constant.
  • C
    in level flight, manifold pressure will remain constant when the rpm is increased by opening the throttle.
  • D
    the propeller setting is constant at all indicated airspeeds.
In a normally aspirated engine fitted with a fixed pitch propeller, the RPM variations are subject to the power setting and the TAS of the airplane. For a fixed throttle setting in a constant climb, the MAP will only change according to atmospheric pressure. Therefore, as you’re climbing the ambient pressure decreases and so does the manifold pressure.
 

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