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Questions tagged [constant-speed-propeller]

A propeller that uses a governor to keep its rotation speed from varying excessively.

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30 votes
1 answer
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How does a constant-speed propeller work?

My explanation of how a constant speed propeller works has always been a little shaky. I know about the "speeder spring," "counter-weights," and how it utilizes the engine oil pressure, but I'd love ...
Canuk's user avatar
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5 votes
4 answers
33k views

What's the rule of thumb for power and rpm in a constant speed prop?

I think I understand the relationship between the power lever and the RPM lever in an aircraft with a constant speed prop thanks to this question. However, what'd be a general rule of thumb for flying ...
Pepedou's user avatar
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7 votes
3 answers
4k views

In a constant speed propeller, why does the RPM drop with a prop pitch increase?

When a constant speed propeller changes its pitch from low to high, RPM would decrease. Why is that the case? Wouldn't the RPM increase when we increase the blade angle since there's less drag and ...
nyorkr23's user avatar
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3 votes
3 answers
4k views

What is the relation between manifold pressure, RPM, and power, in a constant speed prop?

I know that there are similar topics here, one is mine even, but still I have few questions about constant speed propeller. My questions: Why if we decrease RPM and maintain throttle lever setting ...
Konrad's user avatar
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5 votes
4 answers
4k views

On a constant speed propeller, how is blade pitch related to airspeed and efficiency?

I'm trying to wrap my head around what the PHAK (Pilot's Handbook of Aeronautical Knowledge from the FAA) states for constant speed propellers. First, why is it that if airspeed increases, for a ...
Flak's user avatar
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7 votes
2 answers
3k views

What dictates the prop RPM used during cruise?

I've seen on numerous different constant-speed propeller aircraft and different pilots using different RPMs during the cruise phase on a propeller aircraft. What dictates the RPM used during normal ...
Qantas 94 Heavy's user avatar
6 votes
2 answers
4k views

How do different RPM–MAP settings affect range?

For a cruise in constant-speed prop aircraft, you can choose different combinations of the manifold pressure and prop rpm to generate the same amount of power. For example, in order to generate 117 ...
lemonincider's user avatar
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5 votes
4 answers
5k views

Did WW2-era aircraft have constant-speed or variable-pitch props?

This is slightly related to my other question on variable-pitch controls. I want to know if WW2-era aircraft typically had variable-pitch or constant-speed propellers. Variable-pitch lets the pilot ...
DrZ214's user avatar
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3 votes
0 answers
163 views

What are the range of feathering speeds for electric constant speed props?

I flew a motorglider with an MT-7-A electric CS prop which takes 90 seconds to fully feather. Contrast that to a hydraulic governed prop, which takes just a few seconds to go from one extreme to the ...
Kenn Sebesta's user avatar
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2 votes
0 answers
350 views

What Inertial effects should be considered to achieve blade stability on a Variable Pitch Propeller tailoredby aerodynamic loads?

I am developing a self adjusting variable pitch propeller tailored by its pitching moments due to aerodynamic loads setting the blade rotation axis in an offset from the aerodynamic center as shown ...
george's user avatar
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How to define pitch angle for a passive variable pitch propeller?

This question is a continuation of the question How to calculate variable pitch propeller parameters? mentioned before. Actually, the theory described as an answer on the question above is the exact ...
george's user avatar
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