La Jolla Military Helicopter Fly-By

Awesome.

[AndyP]

Some people dont realise how loud choppers really are close

[hueydevotedUH]

Buzzing beaches was much fun. Miss it

[PNW_Car_Mods]

This video should have 1 million views!

[vanished]

I love the sound of a Chinook, gives me goosebumps!

[FlyingReb]

Great Catch ! That was the Royal Airforce HC4 Chinook! They train at El Centro a lot

[spawntez]

Been there, done that, miss those sweet days. Semper Fi Devil Dogs

[tobiasrabelink]

That's right, because helicopters are very noisy

because what you hear is the interaction sound of the rotor blade vortex and that is created when a rotor blade passes near the abrasive tip vortices of the previous blade
This is known as high amplitude impulse noise

the rotor downwash of the chinook helicopter is 160 km per hour

and the high-pitched scream is caused by the first stage compressor shearing through the air at the intake
Air is compressed, which is called the ram effect
and the blades cut through it and ramming that air against the first stator