Vehiclesone-shot · 3.05 s
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Helicopter Hover
An overhead helicopter holding position, with weighty blade chop, turbulent rotor wash and turbine whine.
loop · 4.00 s · 0 downloads · 0 likes
0.00 / 4.00 sLight utility
Tweak
renders in the CLI · WAVChange parameters to build an exact command. Your agent runs it with sb and gets the WAV.
$ sb get FK27PE8EFP@1 --preset light-utility -o helicopter-hover.wav
How it's made
- Source
- main-rotor loading produces 12-26 blade passes/s, with a smooth bipolar pressure pulse and a 15-35 ms turbulent swish per pass; alternate blades have slightly unequal loading.
- Body
- rotor harmonics occupy 28-1400 Hz; broad turbulence and a short 650 Hz slap add blade definition. The pressure pulse is a finite harmonic sum, not a discontinuous waveform or impact click.
- Layers
- a quieter tail rotor modulates 700-2600 Hz air at 5.5 times the main blade-pass rate; two weak turbine shaft tones near 1.4-3.8 kHz sit inside a broad engine-noise band.
- Envelope
- sustained hover, with 0.25/0.5 Hz loading corrections and smooth cyclic blade envelopes. Blade rates snap to whole-Hz steps; all rotor phases and corrections close across the 4 s loop.
- Movement
- shared periodic phase warping gives small speed fluctuations without a flyby pitch sweep. Distance removes upper harmonics and turbine detail; the low rotor remains almost mono.
- Variation
- seeded blade phases and independent air streams; presets cover heavy lift, light utility, distant patrol and close overhead. No baked reverb; loop crossfading joins stochastic air.
| Parameter | Range | Default | Unit | Controls |
|---|---|---|---|---|
| bladeRate | 12 – 26 | 14 | Hz | Blade-pass rate |
| weight | 0 – 1 | 0.8 | — | Rotor weight |
| wash | 0 – 1 | 0.55 | — | Rotor wash |
| turbine | 0 – 1 | 0.75 | — | Turbine detail |
| distance | 0 – 1 | 0.3 | — | Overhead distance |
| seed | int | 1 | — | Variation, reproducible |
The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.
Revision history1
- r12026-10-25engine 1.0.1use('FK27PE8EFP@1')