Science behind helicopter noise
"To reduce the number of noise complaints, HAI’s Fly Neighborly Guide recommends flying higher and further away from populated areas when possible".
“The BVI noise is the particularly dominant noise of the helicopter in approach condition, and this is why the approach condition is the noisiest flight condition for the helicopter,”
Helicopter generated infrasound
The sound spectrum generated by a two-blade Bell 206 helicopter.
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InfrasoundHow does infrasound affect humans?
Can infrasound kill you? What is an example of an infrasound? What does infrasound feel like? 
The Fear Frequency"The key here is frequency: 19hz is in the range known as infrasound, below the range of human hearing, which begins at 20hz. Tandy learned that low frequencies in this region can affect humans and animals in several ways, causing discomfort, dizziness, blurred vision (by vibrating your eyeballs), hyperventilation and fear, possibly leading to panic attacks".
Noise Sources and Their Effects
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The FEAR Frequency: InfrasoundUse ear buds or headphones to listen to the sound below
Listen to 20 Hertz -The theoretical minimum frequency a human can hear
Have you seen a ghost?
Helicopter downwash
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Mission Helicopter joy ride promotion
CASA response to Mission Beach Cassowaries enquriy
CASA explained
Collision with water involving a Kestrel operated Sikorsky S-64E Skycrane helicopter
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