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Questions tagged [constant-speed-propeller]

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2
votes
3answers
124 views

Is the purpose of variable pitch propellers to maintain an optimal angle of attack?

I recently had a discussion with an aviation expert, who works as a Flight Instructor, about constant speed propellers - variable pitch propellers - on light piston aircraft. I have always known that ...
1
vote
1answer
99 views

How to lean with constant speed prop on multi-engine aircraft without EGT

This question is more about the indication of engine roughness. The procedure for leaning without an EGT is clear in the POH and Lycoming documentation which basically states as follows: Best power: ...
7
votes
1answer
219 views

Why did the propellers not fail to the feathered position in the Atlantic Southeast Airlines Flight 2311 Crash?

In the ASA Flight 2311 crash the failure of a quill resulted in the loss of propeller pitch control. The propellers ended up with a pitch angle of 3 degrees which caused reduced thrust and increased ...
4
votes
3answers
488 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 ...
16
votes
4answers
3k views

Why are there extra restrictions on constant-speed propellers?

Constant-speed propellers are far more efficient than non-constant-speed propellers, allow the engine to be made considerably simpler (due to removing the need to continuously adjust the ignition ...
0
votes
1answer
1k views

How to calculate Blade angle?

If we know the helix angle is 3angle, forward speed is 150mph, and rotational speed of propeller is 1500rpm How can i calculate the blade angle of propeller ?
2
votes
1answer
337 views

Why do MP and RPM adjustments have to be made in a specific order in constant-speed props?

Can anybody explain why do I have to pull back RPM lever first and then pull back MP after climbout when setting up my cruising speed MP/RPM combination. When I make an approach to land I do vice ...
1
vote
0answers
199 views

What calculations are needed for counter-weight balancing on a propeller?

I am designing a small-scale propeller and i have managed to design on optimized geometry for the blade. However the blade pitch angle adjusts according to different flow speeds so i need to mount ...
1
vote
0answers
158 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 ...
5
votes
3answers
2k 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 ...
0
votes
0answers
308 views

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 ...
6
votes
2answers
1k 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 ...
5
votes
4answers
11k 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 ...
6
votes
1answer
1k views

How to read the propeller range chart for DHC-6 Twin Otter?

I understand constant speed propellers and beta range. However, I'm not completely sure I'm extracting everything from this chart that appears in a manual for a flight sim model of the Twin Otter. ...
9
votes
1answer
608 views

Why shouldn't variable pitch propellers be operated at low speed?

Aircraft with variable pitch propellers usually have a red arc on the propeller speed gauge somewhere between about 500 and 1000 rpm, often accompanied by placard like "stabilized propeller operation ...
7
votes
2answers
2k 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 ...