Linked Questions
33 questions linked to/from What is the propeller efficiency, $μ_p$, of modern propellers for light sport aircraft?
5
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How does the nozzle diameter affect the thrust of a ducted propeller?
I currently do some experiments with ducted propellers in which I try to figure out which effect a nozzle has on the thrust produced.
My theory goes like this: If I reduce the exit diameter of the ...
- 351
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2
answers
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Is 1 propeller always more efficient than 2?
Based on other answers I've read here (1) (2) (3), a single large blade propeller is the most efficient type of thrust you can get.
There are 2 reasons for this (as I understand it). Firstly, ...
- 1,201
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What is the maximum theoretical lift of a plane as a function of engine power and surface of the wings?
Maximum theoretical lift of a plane as a function of engine power and surface of the wings?
I know that the maximum static thrust of a propeller turned by an engine of power $P$ can not be greater ...
- 3,371
6
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2
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Why don't contra-rotating propeller configurations with more than two propellers exist?
I wasn't able to find a single example of more than two propellers stacked axially in a contra-rotating configuration. There is a huge number of contra-rotating propeller setups, but it is always a ...
- 631
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2
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How does climb-rate vary with density/pressure altitude?
I'm seeking to write a little web or phone app which can help me choose the best cruising altitude based upon winds aloft. I know Garmin Pilot (and probably Foreflight) have a cruising altitude ...
- 309
7
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1
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How much energy/prop efficiency does the e-volo copter sacrifice by having a smaller propeller?
It seems like on an electric aircraft, it would be very important to have a high energy efficiency. Wouldn't the e-volo copter be much less efficient due to the small radius of the propellers when ...
- 1,349
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Is there a special way to calculate the (parasitic) drag produced by the propeller?
Is there a special way to calculate the drag produced by the propeller? Can I compute it with the standard formula for parasitic drag, with the circular area of the propeller as the wetted area?
To ...
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1
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What is the Efficiency of Cessna-150's Propeller?
From that Cessna-150's data, it used Continental 0-200-A 100 HP (75 kW) at 2,750 RPM and with Fixed Pitch propeller with its diameter=69 inches. If power is delivered maximum to the propeller (through ...
- 4,411
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1
answer
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What is the difference between types of propeller? [closed]
I have been noticing almost every Multirotor vehicle uses a single thin double-bladed propellor on each axis. And yet clearly, there are some that do not fit the norm.
Can someone explain what the ...
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1
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static thrust vs. prop RPM data?
edit: question was too long, and is actually simple, so I removed unneccesary description
Background:
There are many questions here about:
propeller efficiency
changes to thrust when it is dynamic
...
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0
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2
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Would large, low aspect ratio fan/propeller blades be more efficient? Why not?
With reference to this answer
We read in the above that accelerating a larger mass of air by a smaller amount is (theoretically) more efficient. This is an advantage of a larger propeller than is ...
- 3,524
4
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1
answer
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Matching the Drag Equation to Real Airplane Data
I am trying to compute airplane performance for a piston-driven airplane with constant speed prop using the standard equations for Lift, Thrust and Drag. I have found that there are a couple of useful ...
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2
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2
answers
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How much is a swashplate system more energy efficient than a fixed blade system for the same load
When reading about the lifting capacity of swashplates (as found in helicopters) vs fixed blade systems (as found in e.g. DJI drones), I read a lot of comments about the fact that the bigger rotors of ...
- 117
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2
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Can the measured thrust of a propeller be greater than the max thrust predicted by Froude's theory?
Can the measured thrust of a propeller be greater than the maximum possible thrust predicted by Froude's Propeller Theory?
Is Froude's theory reliable in practice regarding the upper limit of the ...
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1
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How energy efficient is an aircraft take off?
How much work is generally done by an aircraft (e.g. B737NG) in order to reach V_rotate, and how does this compare to the energy content of the fuel that is used?
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