Questions tagged [aircraft]

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

27 questions with no upvoted or accepted answers
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Lighting an Electric Bulb with Earth's Magnetic Field

Yesterday, I was solving some problems of Electromagnetic Induction. Suddenly a thought struck my mind. Earth has its own magnetic Field.If an aircraft of metallic body is flying in the air then ...
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Drag and lift as a function of speed

Assuming turbulent flow, the drag force $F_\mathrm d$ and the lift force $F_\mathrm l$ are usually given in terms of the following equations $$ F_d\, =\, \tfrac12\, \rho\, u^2\, c_d\, A $$ $$ F_l\, =\...
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1answer
95 views

Aeronautical Physics induced drag direction

I am a 9th grader doing a science fair project at my local high school. I am doing a science experiment on different plane wings and how the angle of attack affects drag. I need to create a rig to ...
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158 views

Why is the water in a cup not inclined (opposite the cup) when the plane takes a turn?

When a aircraft takes a turn: Why is the water in a cup not inclined (opposite the cup)?
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199 views

Turboshaft Turbine Mathematical Model

Are there any simplified mathematical models for how two gas coupled turbines (also called a free power turbine) should interact with one another as the speed of the driving turbine changes. (i.e.) ...
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217 views

Control cable failure and critical flutter speed margin?

I'm a private pilot, and I have some questions to those who have knowledge of the aeroelastic effects and flutter phenomenon. I would like to talk a little about aerodynamic flutter onset speed and ...
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2answers
61 views

Problem involving the 4 forces that maintain an airplane in level flight

The 4 forces affecting an airplane in level flight are gravity, lift, thrust, and drag. By altering one, the others are affected. My question is could a wing (retractable) be installed on top of a ...
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Is there a physical limit to silent quadcopters, and what are the parameters?

Quadcopters can now navigate fairly well indoors. One could imagine many possible uses, including telepresence and security, but which are limited because of the loud noise. Assuming zero 'motor ...
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94 views

Rate of change of heading in terms of normal acceleration and air speed

Let's say an aircraft is traveling with speed $|\mathbf v|$ with respect to an inertial frame. The aircraft is able to execute turns by producing an acceleration $\mathbf a$ that is normal to $\mathbf ...
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1answer
36 views

How would I calculate the speed passengers 'jump' based on the speed and displacement of a plane during turbulence?

I read recently that if I'm in a plane that hits turbulence, the plane might only move 1 to 20ft. However, due to the speed that plane is travelling at (say cruising at 550mph). The passengers in the ...
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26 views

Cold airplane window frame

I was flying from Asia to Europe and noticed that the bottom of the window frame was ice cold while the top was warm. Why? My theory: The sunlight warming the air between the "inner window" and the "...
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73 views

Why does a car need so much power to get to a given speed compared to an aircraft?

This question has been bothering me for a long time because it seems like it should be obvious, but I can't figure it out. Excuse me if I'm being dumb. Why does a car require so much more power then ...
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282 views

What are the 3 Euler angles?

I am currently reading up on inertial measurement in aircraft systems. Euler angles are one of the concepts I am a bit confused with. In an Euler angle-rate matrix there seem to be 3 parameters: p, q, ...
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2answers
93 views

Wouldn't the air accelerating over the top of the wing push the wing forward (thrust)

A wing accelerates air on top of itself. Does this cause any forward thrust? I would think so because the air is accelerating backwards which should create an equal and opposite reaction forward.
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speeding up airflow over wings while keeping the propulsive efficiency?

So, let's say we have an aerofoil and we were to apply thrust at where the air speed was the greatest. See figure: Since we apply a thrust to the air it will speed up, thus reducing the pressure even ...
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20 views

Center of lift in an aircraft

what is center of lift in an aircraft? How is it different from aerodynamic center and center of pressure? Why is COL important?
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1answer
50 views

Why an aircraft or a ship produce pressure waves both in front and behind them?

I think it is obvious why a pressure wave is produced in front of a moving object but why the rear of it should produce a wave?
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69 views

Thrust needed from an engine to reach orbit

Assume you had an airplane with magical engines that didn't need fuel, air or power, to operate. What thrust to ground weight ratio would the airplane need to reach orbit? By ground weight I mean mass ...
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1answer
26 views

Is Gyroscopic precession relative to the object in precessions axis of movement when there is drag imposed on the disc?

Does my question make sense? I am referring to the disc of an AutoGyro aircraft. Though the fuselage of a modern pusher AutoGyro will weather vane into the wind, the disc that provides lift does not. ...
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1answer
271 views

What happens if a helicopter's propeller spins in reverse?

I know airplanes and helicopters fly thanks to the same principle, the Bernoulli Principle. The wings and blades are designed so that the air travels faster across the up side than it does on the ...
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78 views

Can a statically charged object flying in an airplane float?

Lets say you are flying in a plane headed due west at 1000 km/h (278 m/s) with an altitude of 10km. According to http://www.ngdc.noaa.gov/geomag-web/#igrfwmm, at 10km altitude, Earth's magnetic field ...
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2answers
61 views

Can an Adequately Long Tube Float?

I was just pondering in my head one day (I don't recall what I was pondering), but I came across the thought: If an adequately long (and light) tube is placed in the atmosphere, can the difference in ...
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1answer
73 views

How does gravity effect to aircraft in sky?

Aside aerodynamics and buoyancy, Is there a simple way to explain how gravity is negligible in flight paths using free falling body diagram? In a parabolic trajectory,we know that at max height, ...
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2answers
44 views

Does the temperature of the body of an aircraft increases its efficiency?

I am actually working on a prototype of a Plane, i was wondering if the temperature of the body of the plane can make the Plane more efficient, if the structure is at 25°C needs less energy to ...
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1answer
17 views

Forces on ball thrown inside fighter cockpit during a manoeuvre

In a fighter aircraft, if pilot throws a ball vertically inside cockpit, and carries out a '6 g' turn, will the ball also undergo 6g force?
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3answers
2k views

Forces involved in a climbing jet aircraft

I have a problem with which I need help. The question is: A jet aircraft is climbing at an angle of $45^\circ$ above the horizontal axis and is accelerating at $4.5~\rm\frac{m}{s^2}$. What is the ...
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2answers
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Flying with or against rotation of a planet

So, I've read a bunch of articles about how, somewhat contrary to intuition, it's usually faster to fly with the rotation of the earth versus against it. All the answers have to do with wind and ...