Why Does My Power Required Curve Lack a Reverse Command Region?

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SUMMARY

The discussion centers on the absence of a reverse command region in a power required curve for a fixed pitch propeller system. The user reports that their curve only ascends from minimum velocity (vmin) to 230 mph, which deviates from expected behavior. Key specifications include a 107 hp engine operating at 3300 rpm and a maximum lift coefficient (clmax) of 1.35. The user seeks clarification on whether a power required curve can exist without a reverse command region and how a fixed pitch propeller can generate reverse thrust.

PREREQUISITES
  • Understanding of power required curves in aerodynamics
  • Knowledge of fixed pitch propeller mechanics
  • Familiarity with engine performance metrics (e.g., horsepower and RPM)
  • Basic principles of lift and drag in aviation
NEXT STEPS
  • Research the characteristics of power required curves in fixed pitch propeller systems
  • Explore methods for generating reverse thrust with fixed pitch propellers
  • Study the impact of clmax on aircraft performance
  • Investigate the relationship between engine power output and propeller efficiency
USEFUL FOR

Aerospace engineers, aviation students, and aircraft performance analysts will benefit from this discussion, particularly those focused on propeller dynamics and power curve analysis.

subsonic
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Can someone help me. Why does my power required curve doesn't have the region of reverse command? It goes up from vmin to 230mph. It never goes down. Thats not normal for the power required curve.

Attached is the region of reverse command that a power required curve should possess.

Details:
Propeller fixed pitch
engine 107hp @ 3300rpm
clmax= 1.35



what should i do? Is there a possibility to have a power required curve
without region of reverse command.
 

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  • regions of command.jpg
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If it's got a fixed pitch prop how does it manage to provide reverse thrust?
 

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