Why are some planes so loud?

Aircraft do a lot of ‘varying air pressure’ whether it’s propulsion or lift, so they’re noisy. That’s it really. Simply stated, most of the noise is because of the friction between the high velocity air exiting the engines and the relatively slow surrounding air. When you move lots of air, it makes noise.

Why do I keep hearing airplanes?

Airplane ear occurs when the air pressure in the middle ear and the air pressure in the environment don’t match, preventing your eardrum (tympanic membrane) from vibrating normally. A narrow passage called the eustachian tube, which is connected to the middle ear, regulates air pressure.

Why do my ears hurt when I’m on a plane?

When an airplane climbs or descends, the air pressure changes rapidly. The eustachian tube often can’t react fast enough, which causes the symptoms of airplane ear. Swallowing or yawning opens the eustachian tube and allows the middle ear to get more air, equalizing the air pressure.

What causes exhaust noise in airplanes?

Exhaust noise is caused in aircraft the same way it is in autos. However, the typical aircraft engine used in the trainers mentioned by the OP is a four cylinder turning more slowly, so the combustion events required to make high power are two or three times bigger.

Why are some planes quieter than others?

Smaller engine and propeller generally means less noise. Turbo-diesel powered airplanes like the Diamond DA-40s are quieter because the turbo muffles the exhaust noise.

Why is the prop of a jet engine so noisy?

There are two sources of external noise, the prop and the engine exhaust. Noise from the prop is caused by its tips approaching supersonic speed. Energy used to produce noise is wasted, so you’d think reducing speed would be helpful.

Why does an airplane sound the same when it approaches you?

The effect you noticed is the result of the combination of Doppler effect and sound absorption. where α is a dimensional constant, x is the traveled path, and ν is the sound frequency. In its own reference frame, the airplane emits always the same sound, irrespective of whether it is approaching or receding from the observer.