Questions tagged [aircraft]

Aircraft are man-made vehicles intended to operate while flying through Earth's atmosphere.

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Goniometer stages/positioners stacking

I am working on a project related to calculation of roll/pitch/yaw misalignment. I am new to the field and trying to understand. I more or less understand math behind this - order of rotations is very ...
exbluesbreaker's user avatar
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1 answer
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The relationship of yaw and roll on a spacecraft using Trust Vector Control

I’ve previously asked the question how does applying rudder (yaw) on aircraft also cause roll. Turns out it’s caused by both the rudder usually being above or below the center of mass and the ...
CancelAnime's user avatar
1 vote
1 answer
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How does the newton's third law generate enough lift to make the airplanes fly? [closed]

How does the newton's 3rd law generate enough reaction so as to make the airplanes fly to great heights? The airplanes push air downwards but really is that enough to make the airplanes fly to great ...
Nuclear fusion's user avatar
10 votes
5 answers
3k views

Is it possible to statically generate lift with the difference in pressure like wings?

If I understood it correctly, the shape of the wings and/or propellers generates lift/thrust with the difference in pressure in both sides of the wings/propellers; where the lower side has higher ...
Fulano's user avatar
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PI controller - output calculation [closed]

The propeller of an airship is connected to a DC motor. The motor is being controlled using a PI controller. The PI controller has a proportional gain of Kp = 2, and an integral gain of Ki = 0.5, and ...
puma's user avatar
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Why are the blades of a pedestal fan so different from the blades on an aircraft propeller?

Both fans and propellers move a quantity of air. In the former, that is the end goal. In the latter, this movement of air creates a force in the direction opposite to the airflow. So, why are the ...
user85392's user avatar
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3 answers
157 views

Would Aeroplanes or Helicopters work on our Moon?

Would Aeroplanes or Helicopters work on our Moon? In general , I think , in Aeroplane Case: (1) Air is required for Aeroplanes to float : Would Moon have enough air? (2) High speed is required for ...
Prem's user avatar
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Any skilled pilots? Explain how a craft flies over the curve of the earth [closed]

So, flat earthers believe that there are no adjustments, whether in manual or autopilot, to maintain level flight over curved surface such as earth. But, altitude is determined by barometric pressure (...
Peter Janak Jr's user avatar
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2 answers
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Windspeed and Aeroplanes

Say we had an airplane cruising at velocity $V$ and the airplane was going from point $A$ to $B$. If the wind was also blowing in the same direction from $A$ to $B$, at a velocity $U$, could we say ...
nav op's user avatar
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Why are the vectors for the pressure above the airfoil bigger when pressure is actually lower?

This image displays "Pressure vectors and flow over cambered section". As far as I understood fluid dynamics, the static pressure is lower in areas where the fluid flows at a higher speed. ...
Mino's user avatar
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Energy balance in fixed wing flight, action/reaction

When an airplane is in flight the engine of the plane overcomes drag until the plane is moving forward fast enough to balance drag. In a stable configuration the air moving over the wings creates lift ...
Chboe5771's user avatar
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The suction and thrust of an aircraft engine

Does only the air sucked in (not the air that is ejected at the back of the engine) by an airliner engine (turbofan engine) causes a thrust forward or in other words pull the engine forward? and why ? ...
Sebastyen Laroche's user avatar
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What is the main role of the Angle of Attack of an airplane, as in mainstream explanation of lift? [duplicate]

The question is conceptual and simple, it needs no more information to answer it. And I wish not to influence the answerer.
Arpi Sz's user avatar
2 votes
2 answers
45 views

What is the useful limit for ground effect on an object? [closed]

What the maximum size an object can benefit from ground effect? Also known as riding a cushion of air created from flying close to the ground, some birds can use this effect to fly with less energy ...
Justintimeforfun's user avatar
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Sonic boom mitigation by leading low pressure via intake?

As a thought experiment to try to illustrate my question below: If a fan was moving forward at the speed of sound but was rotating such that the low pressure created by the fan's rotation was equal to ...
RC Stuff's user avatar
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What is circulation, regarding a wing, and why does it happen?

I was wondering, in layman's terms, what causes circulation around a wing? I understand that flight is a combination of Bernoulli's theorem and Newton's third law. The Coanda effect and Kutta effect ...
Thomas Stokes's user avatar
1 vote
2 answers
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Aircraft turn displacement from non-linear turn rate (instantaneous roll rate)

I've been trying to figure out an aircraft kinematics problem to estimate the x and y offset relative to current position after completing a turn. The turn is a specific change in heading, finishing ...
Odin Venti's user avatar
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1 answer
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Convert BLDC motor thrust in grams ($\rm g$) to Newton ($\rm N$)

I am making a quadcopter with takeoff weight equal to 2 Kg. Using thrust to weight ratio of 3:1 the required thrust per motor is 1500g. (No experimental thrust has been obtained for thrust.) Now I am ...
JBK2's user avatar
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1 answer
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Battery efficiency [closed]

I have 4000 mah 4 cell and a 5000 mah 3 cell Which battery is more efficient. Higher mah or more number of cell. I am selecting batteries for rc plane
Anurag Gupta's user avatar
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Calculating kwh required to get an aircraft to 1000' based on climb rate

I'll start with the question and then provide context: to get an aircraft to 1000', does a steeper climb angle consume more energy? Assume the flying speed and angle of attack stay constant. This ...
Ben Rogers's user avatar
4 votes
6 answers
804 views

Origin of the thrust force in jet engine

I am reading a lot about the jet engine operation and I meet mostly explenation that the thrust is generated thanks to the exhaust nozzle that "accelerates" the air. However the nozzle ...
Alek Przybyłkowski's user avatar
1 vote
1 answer
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Which direction will a truncated cone be pushed by airflow?

Consider the shape below, with the bottom and top faces being holes. Imagine we hold the shape in place and blow a wind into the big hole. The air will exit the small end at a higher velocity due to ...
Joey Peluka's user avatar
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2 answers
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Does general relativity predict different forces on aircraft than Newtonian mechanics?

When taught how airplanes fly, we are probably always given the Newtonian mechanism: that four forces act on an airplane; lift and weight on the vertical axis, and thrust and drag on the horizontal ...
Sagierian's user avatar
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Relative efficiency of airplanes and helicopters, why is this argument wrong?

I'm trying to better understand why helicopters are less fuel efficient per unit distance than airplanes. One argument I keep seeing in other questions on the topic is that helicopters actively ...
TheEnvironmentalist's user avatar
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How are shockwaves created if no particle goes around the wings at supersonic speed?

so,the title could be a bit misleading, let me elaborate: whenever studying aerodynamics, the explanation starts with considering the wing of a plane still, and the flow of air arriving from either ...
Mcola's user avatar
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6 votes
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Is the downforce of rain on airplanes negligible?

Is the downward pressure exerted by raindrops in even a strong storm on a lightweight aircraft negligible? Someone better informed may likely improve the following reasoning, cobbled together from ...
Camille Goudeseune's user avatar
1 vote
2 answers
45 views

Finding windspeed gave me negative time value

This is a homework question, I will make it as concise as possible: A 1-way plane trip is 2800km and the plane's airspeed is 790km/h. The plane flies with the wind on the way there, and against it on ...
Cotton Headed Ninnymuggins's user avatar
1 vote
2 answers
84 views

Newtonian mechanics vs. Pressure in Flight [duplicate]

Which one is better to describe lift of a plane wing: Newton's third law of motion: (The wing applies a force on air and the air applies an equal and opposite force on wing - which causes lift.) OR ...
Dstarred's user avatar
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19 votes
1 answer
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Why is an airfoil shaped like a teardrop?

I understand the reason airfoils are cambered on the top: to create lift. But one would assume this would result in aircraft wings having a semicircle-shaped design. Why is the cross-section of an ...
James Davis's user avatar
-1 votes
1 answer
66 views

The lift of an airplane is similar to that of a balloon. It uses the density difference of air, right?

The lift of an airplane is similar to that of a balloon. It uses the density difference of air, right? The air density on the top surface of the balloon is low and the air pressure is small. The air ...
enbin's user avatar
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Impact of the location of the aircraft propeller on yawing moment

we know that the effect of P-factor on puller propellers is the yawing moment in the opposite direcrion. i mean if we had a load(thrust or lift) on the right side of propeller , then airplane will yaw ...
alireza's user avatar
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1 answer
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How can we calculate $g$ force in this maneuver?

How can we calculate $g$ force in this maneuver? We are not dealing with conventional maneuvers like level turn or loop so what equation used to calculate g force in this maneuver? What about other ...
alireza's user avatar
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1 vote
0 answers
280 views

Would helium-3 be a better lifting gas than normal helium?

Buoyant force is proportional to the mass of the fluid displaced minus the mass of the volume doing the displacing. Thus the best choices of lifting gas are nothing(vacuum), hydrogen, and then helium ...
Adam Lincoln Steele's user avatar
1 vote
0 answers
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Subsonic flight in saturated steam vs. air

I am wondering whether differences in density, temperature, viscosity, drag coefficient, or lift coefficient between steam and air might affect subsonic flight through these media. Let's assume ...
Alwin's user avatar
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How much energy does a bird use gliding, vs how much energy is there to capture in the moving air?

So I have this image in my head of a robotic pigeon with a wind turbine strapped to it. For the purpose of this mental image, imagine the robotic pigeon is in every relevant way just like an actual ...
Andrew Micallef's user avatar
2 votes
4 answers
208 views

Why does a fluid follow the wing?

When air is moving above and under a wing that is curved, why does the air at the top of the wing follow the wings shape and go downwards when it could just go in a straight line? It doesn't make ...
b0red's user avatar
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2 answers
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What direction is aerodynamic lift in?

So I was researching about aerodynamic lift, in all the research I read it says lift is perpendicular to the flow direction. But in 3d space there isn't only one perpendicular vector to a given vector....
0Shank's user avatar
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5 votes
3 answers
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Converting heat to mechanical energy

Could an object convert heat in the air around it to mechanical energy in order to accelerate itself? In other words, the craft would take in surrounding air composed of random-velocity molecules and ...
Joey Peluka's user avatar
0 votes
1 answer
46 views

The effect of velocity on the $g$-force applied to the pilot [closed]

In a level flight (not maneuvering), if an aircraft increases its velocity from Mach 0 to Mach 10, how much $g$-force is applied to the pilot? Is that any equation for it?
alireza's user avatar
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1 vote
0 answers
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Is there a formula to calculate how much thrust flapping flight generates? [duplicate]

Suppose you have a bird or an ornithopter flapping wings - is there a formula and what parameters would would you need to figure out how much thrust the flapping of wings generates?
Steven Yang's user avatar
2 votes
3 answers
428 views

Using gyroscopes to turn airplanes

Could multiple gyroscopes be used to change direction in a flying vehicle? Im a physics noob and don't really know what else to add... If having one gyroscope allows you to change your direction in 90°...
ryEnigma's user avatar
0 votes
1 answer
34 views

Can ellipsoid aircraft reach high speeds [closed]

Imagining an ellipsoid aircraft/spacecraft something like Could something like this reach high speeds? Assuming those nacelles hold some high tech ramjets or something equally powerful. I noticed ...
Gollor's user avatar
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-1 votes
1 answer
144 views

What is the difference between a kite and a glider?

A kite and a glider, both fly without an engine. If both are unpowered, then what is the difference between a kite and a glider? Are all gliders kites? Or are all kites gliders? How do they differ? ...
Shibu Nagendran's user avatar
1 vote
1 answer
108 views

Propeller Spiral Slipstream

I know the common accepted answer is that in an airplane, the propeller pushes air back but imparts rotational flow to the air, and the rotating air around the body of the aircraft hits the back ...
Anthony Schrayer's user avatar
1 vote
0 answers
122 views

"Constant thrust" engine vs "constant power" engine

I read that a piston engine, under maximum fuel intake, provides constant power, while the thrust depends on velocity, while a jet engine is the opposite - provides constant thrust, with the power ...
AnatolyVorobey's user avatar
0 votes
1 answer
95 views

Why don't CPU fans have the buzzsaw effect (as in planes), even when their blades spin faster than 5k RPM? [closed]

I saw my CPU fan using HWinfo spinning faster than 5k RPM, in which the buzzsaw effect starts in an A3xx plane. Why doesn't my CPU fan do the buzzsaw effect, even though it's spinning faster than 5k ...
s3246's user avatar
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0 votes
0 answers
26 views

Finding aerodynamic coefficients of an airfoil using numerical data measured in wind tunnel

I am trying to find all the aerodynamic coefficients of an airfoil at different angles of attack. I have .DAT files for data which have 4 columns of data all in order {angle of attack[deg], Lift[N], ...
chand sureja's user avatar
0 votes
1 answer
56 views

Measuring Bernoulli in airplanes

One common explanation for airplane lift is that air pressure over the wing both moves faster and has lower pressure, a la Bernoulli. A very different explanation is that air is deflected downward by ...
Steve Stahler's user avatar
0 votes
0 answers
298 views

Why does Wind Velocity over a wing to increases and what is its cause?

Why does wind velocity increase over a wing? Also I have a bit of a paradox, people explain lift by saying there is a lower pressure region on the top of the airfoil and a higher pressure region on ...
3000 IQ's user avatar
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1 vote
2 answers
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What is the bare minimum of air density you need to fly a helicopter?

How high will a helicopter be able to fly before the propellers have not enough air particles to achieve lift? What is the minimum air density needed to achieve flight with a helicopter? Could you ...
Mohammed Ali's user avatar

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