The noise of flying machines can be a source of joy or annoyance. Let’s have a look at what makes that noise and how much progress has been made over the years!

The F-84F Thunderbirds team

The XF-84H ‘Thunderscreech’!

The Boeing Dash 80, prototype of the B707

Noise creating vortices coming from an airliner’s flaps

The Bypass section of a RR Trent

A possible Airbus blended body design

An APU exhaust

The Gyrodyne Rotorcycle

Images are displayed under Creative Commons licence with thanks to Dreamstime.com – Airbus, the USAF, Boeing Dreamscape, David Monniaux and the US DOD.