Linked Questions
33 questions linked to/from What is the propeller efficiency, $μ_p$, of modern propellers for light sport aircraft?
31
votes
2
answers
42k
views
What are the advantages of more than 4 propeller blades?
I have heard that propellers with more than four blades are not as efficient as 4 or less blades because of lower thrust which may result from interfering prop-streams. But I see the ATR-42/72 and ...
- 11.9k
27
votes
1
answer
18k
views
Is there any equation to bind velocity, thrust and power?
I am designing a remote controlled airship. I will tune it so that the lift given by Archimedes' Principle will exactly balance the weight of all the structure. It will be propelled by brushless ...
- 373
26
votes
2
answers
9k
views
Is it possible to fly with counterbalanced single blade engines?
Refer the image for counterbalanced single blade (Source http://www.aviastar.org/helicopters_eng/bo-103.php).
In ground school, they took us for aircraft inspection at end of our ground school ...
- 1,932
23
votes
4
answers
4k
views
Would an aircraft with contra-rotating propellers longer than the plane's wingspan be able to fly?
I enjoy taking the time to try and visualize how fictional aircraft might actually work in reality. Unfortunately there are some that seem highly impractical from an engineering student's point of ...
- 333
18
votes
4
answers
9k
views
Why is max endurance different for jet and props?
Max endurance speed is not the same for gliders, propeller planes (also for turbo prop, right?) and jet planes.
While for for jet planes max endurance is at the minimum drag speed ($V_{md}$), for ...
- 1,073
16
votes
5
answers
4k
views
Why is thrust inverse to speed in piston engines?
It is said that piston engines have constant power output, and thus their thrust is inverse to speed (e.g. here), while turbines have relatively constant thrust. I'm looking for an intuitive ...
- 293
12
votes
2
answers
6k
views
How is the induced drag calculated for a wing with elliptical planform?
How is the induced drag calculated for a wing with elliptical planform ? Is this wing shape the most efficient ?
- 121
11
votes
7
answers
3k
views
Explained intuitively, why does aspect ratio affect induced drag?
Over the last few hours, I've been trying to intuitively understand induced drag, and how aspect ratio affects it. I already know the equations, but while they explain the relationship, they do not ...
- 119
10
votes
4
answers
3k
views
How can best glide speed be lower than best rate of climb speed?
I was looking up V-speeds for C172. I don't have easy access to an official copy of the POH, but online I found:
$V_y$, best rate of climb speed (at sea level): 76 KIAS (p22)
$V_{glide}$, maximum ...
- 56.2k
10
votes
2
answers
3k
views
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
8
votes
3
answers
5k
views
What is compressibility drag?
I don't mean wave drag here. What is compressibility drag, which is understood to be a form of miscellaneous drag?
- 717
7
votes
2
answers
3k
views
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, ...
- 1,211
7
votes
1
answer
691
views
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
6
votes
5
answers
2k
views
What determines maximum speed of a propeller aircraft - Thrust or Power?
I'm reviewing training materials1 for straight and level flight.
The content focuses on drag types and explains that the required thrust curve is equivalent to the total drag curve. It then introduces ...
- 61
6
votes
5
answers
8k
views
Guidelines for using a constant speed/adjustable pitch propeller
I have been trained in a single engine fixed pitch prop ( C152). I'm trying to move to Piper Arrow II which has an adjustable pitch propeller. I understand how constant speed propellers work. I'm ...
- 1,621