Sonic Ramjet AKA Sonic Resonance Engine

Check out [sonicramjet.com](https://sonicramjet.com) to learn more, or donate!

#### Sonic Ramjet

This document describes a low-frequency sound-based engine—referred to as a *sonic ramjet*—that generates enough thrust to move a small model craft. The design contains **no moving parts** beyond the speaker diaphragm itself. The thrust comes strictly from **sound waves** exiting the nozzle.

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#### Overview

- **Engine**: A 3D-printed resonance chamber (the "engine") that channels 40 Hz sound into a compressed jet.
- **Propulsion Method**: Stacking and resonating a 40 Hz tone approximately three times to form a uniform wave jet.
- **Inspiration**: Sonic booms, deep-bass cars that rattle entire houses, plus a chamber vibration effect that reduces friction (conceptually inspired by water striders).

A single-engine STL is provided here. Additional files for the multi-engine “sound resonance vehicle” setup will be shared separately.
- [Video Demonstration – Small Resonance Vehicle