Propeller Plane Pass

How it's made

Source

a two-blade propeller at 1900-2850 rpm produces a 63-95 Hz blade-passage buzz, built from eighteen phase-related harmonics. A four-cylinder piston engine adds crankshaft and firing-order drone.

Body

exhaust energy at 32-190 Hz and broad 450-1400 Hz mechanical noise sit under the blade buzz; turbulent air is high-passed at 180 Hz, low-passed with distance, and modulated by blade passage.

Motion

a straight 40-72 m/s flight at 35-140 m clearance gives inverse-distance pressure, stereo travel and c/(c + radial velocity) Doppler shift; air absorption darkens the departing aircraft.

Envelope

approach peaks around 2.8 s, followed by a longer receding tail; smooth 0.4 s entry and 1.1 s exit windows bring the six-second editorial pass to silence without switching transients.

Variation

seeded sub-percent rpm wander and slow load flutter keep the harmonics alive; presets distinguish a low trainer, distant cruise, fast sport pass and a slower vintage engine.

Radiation

axial blade radiation softens side-on directly overhead, creating two broad buzz lobes.

Space

dry outdoor direct sound with no artificial reverberation or unrelated wind ambience.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.