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

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The power required curve in question lacks a reverse command region, which is unusual as it typically should include this area. The curve consistently rises from minimum speed to 230 mph without a decline, indicating a potential issue with the aircraft's performance characteristics. The discussion highlights that the aircraft has a fixed pitch propeller and a 107 hp engine, raising questions about its ability to generate reverse thrust. Participants are seeking clarification on whether a power required curve can exist without a reverse command region and how fixed pitch propellers function in this context. Understanding these dynamics is crucial for diagnosing the aircraft's performance issues.
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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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