Sonic Ramjet

Welcome to my site for the Sonic Ramjet project! Below you’ll find the entire text about “Sonic Ramjet: Technical Foundations, Fibonacci/π Expansions, and Double-Bubble Geometry,” plus downloadable STL files, a “shitty gallery” of images, videos, donation info, and more. Enjoy the vibes!

I'm not a scientist, so I used a LLM to help me structure my thoughts, keep notes, and help me through some of the math. I had an idea, an understanding of the wave interactions, and a way to test things in real-time with my 3d printer. The tools we have access to today are insane. Don't let your dreams be dreams.

Video Demonstrations

Enjoy these ad-free, self-hosted videos showing the sonic ramjet in action.

75mm Ramjet Blowing Paper Towels

Vehicle Propulsion Demonstration

Downloads (STL Files)

Below are links to the 3D-printable STL files under a CC-BY license. Right-click and “Save Link As” to download:

Download 75mm Ramjet

Download 39mm Ramjet

Download Sonic Buggy

Useful Links

Support / Donate / Tips

If you think this design is sweet, throw me a donation so I can keep making stuff. If you think it's sweet but can't make a donation no stress. Hope you make something awesome.

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Photo Gallery

Below are some quick snapshots of the Sonic Ramjet prints and setups.
Click an image to enlarge!

How It Works:

Abstract

This paper details the research and experimentation that led to the Sonic Ramjet—a system that channels low-frequency sound waves through a specialized ring structure to create a focused jet of air. By applying Fibonacci scaling and π-based curve lofting, the design achieves smooth, turbulence-free transitions in configurations dubbed “onion” or “double-bubble.” Two primary variants are examined: a 75 mm (3‑inch) speaker build and a 39 mm, 8-ring double-bubble chamber. Both configurations successfully propelled light vehicles on the first attempt, validating the core principles of wave resonance, shape optimization, and frequency tuning (31–40 Hz). The paper also explores future possibilities for plasma-assisted propulsion, expanding on the baseline air-driven jet to further enhance thrust.

1. Introduction

A sonic ramjet directs low-frequency sound waves—typically produced by a subwoofer or compact speaker—through a carefully configured chamber to create resonance. Rather than dispersing sound in all directions, the acoustic energy is focused through one or more expansions and a final nozzle, forming a coherent, powerful jet.

Recent tests have demonstrated:

• Effective airflow generation at frequencies between 31–40 Hz
• Thrust sufficient to propel small vehicles across a table when using only a pair of 39 mm speakers
• Greater output with a 75 mm (3-inch) driver, particularly when employing an onion or double-bubble geometry.

2. Theoretical Basis

2.1 Wave Resonance in a Ringed Chamber

A sine wave at low frequency (e.g., ~31 Hz or 40 Hz) has a wavelength of roughly 8.6 m at room temperature. In a short chamber (often only 15–23 cm), the design must capture partial standing waves.

Placing rings (circular cross-sections) at strategic intervals:

• Reflects and partially confines waves, creating pressure nodes in “bulb” expansions.
• Facilitates wave compression as the cross-section narrows, eventually forming a jet at the nozzle.

2.2 Fibonacci and π-Driven Dimensionality

Natural geometry often favors Fibonacci ratios (~1.618 increments) and circular expansions referencing π. Applying these yields:

• Smooth expansions/contractions: Minimal acoustic turbulence and strong resonance buildup.
• Harmonic synergy: Spiral or flare shapes akin to those found in nature, where wave energy is efficiently managed.

In many cases, rings were scaled by factors of +13%, +25%, or +33%, reflecting partial Fibonacci steps or π-inspired increments. This produced expansions or contractions that “felt” naturally resonant, leading to immediate functional results.

2.3 From Sound to Thrust

Concentrating acoustic pressure within a narrowing nozzle increases the force per unit area. Rather than dispersing outward, energy is channeled linearly, forming a directed jet. This explains how a speaker cone—originally designed for audible sound—can produce sufficient thrust to move objects when enclosed in a resonant structure.

3. Key Sonic Ramjet Variants & Examples

3.1 75 mm (3‑inch) Onion Build (9 inches total)

Overall Dimensions

• Total Length: 9 inches (228.6 mm)
• Speaker Mount (Ring 1): 75 mm (matching a 3‑inch speaker)
• Bulb Section: ~3 inches (76.2 mm) for initial expansion
• Taper Section: ~6 inches (152.4 mm) transitioning to the nozzle

Total axial length sums to ~228.6 mm (9 in). The largest diameter (~105 mm) and mild expansions/contractions in the bulb minimize turbulence, while the final taper drastically reduces cross‑section for a focused jet.

3.2 Short 39 mm Onion Build (6 inches total)

Overall Dimensions

• Total Length: 6 inches (152.4 mm)
• Speaker Mount (Ring 1): 39 mm
• Bulb Section: ~2 inches (50.8 mm)
• Reducer/Taper: ~4 inches (101.6 mm) to the nozzle

Total axial length ~152.4 mm (6 in). The relatively short design compresses low‑frequency sound waves more sharply, producing strong pressure buildup in a compact space.

3.3 39 mm Double‑Bubble (8‑Ring) Engine

An 8‑ring design with two distinct expansions provided particularly effective results in powering a miniature vehicle. In one configuration, the ring diameters were measured as follows:

This double-bubble approach amplified reflections twice, leading to strong pressure waves that coalesced into a jet capable of pushing a small vehicle across a table.

4. Experimental Findings

Tests showed that when operated around 31–40 Hz, these chambers quickly established standing waves. Even modest power (10–30 W) generated a forceful airflow:

• Paper items were blown across the room.
• A small test rig with 39 mm speakers successfully propelled itself on a flat surface.

Because ring diameters and spacing were guided by natural expansions (Fibonacci ratios or π-based loft curves), there was minimal energy loss from turbulence or abrupt angles. Smooth transitions and constructive wave interference produced reliable resonance and strong compression at the nozzle with minimal rework.

5. Plasma Integration (Future Work)

Although the ramjet already produces thrust from air alone, incorporating a high-voltage arc or plasma generator can further amplify the effect by injecting charged particles into the same expansions and tapers. In principle, these charged particles carry momentum more effectively, potentially doubling or tripling output compared to neutral airflow.

6. Possible Uses to Explore

While the Sonic Ramjet primarily demonstrates acoustic propulsion, there are plenty of intriguing possibilities for further experimentation:

• Locomotion for Small Vehicles – Model craft, table-top racers, or other low-friction setups.
• Sound-Based Therapeutic Devices – Exploring resonant frequencies for relaxation or “sound healing” studies.
• Environmental/Industrial Applications – Localized dust or particle clearing using directed low-frequency jets.
• Educational Demonstrations – Teaching about standing waves, resonance, and Fibonacci expansions in a fun, hands-on way.
• Art/Installations – Interactive sound sculptures or low-frequency exhibits that showcase invisible waves turned into directed airflow.

These ideas are speculative, but highlight how the sonic ramjet can move beyond proof-of-concept demos and become a platform for creative or scientific exploration.

7. Conclusion

The Sonic Ramjet demonstrates how Fibonacci scaling, π-driven geometry, and low-frequency acoustic resonance can yield a compact yet powerful propulsion device. Whether it’s a 75 mm onion design, a short 39 mm variant, or a double-bubble approach, these ringed chambers consistently deliver a focused jet of air by harnessing natural wave harmonics.

By guiding acoustic energy with nature’s ratios, we’ve seen immediate success in generating measurable thrust. Future plasma integration may further push this concept into more advanced propulsion realms.

A Personal Note

Hello. I appreciate you taking the time to check this out. Be kind to others, especially those you disagree with. Not everyone is out to get you, and don't waste energy trying to get everyone. We all have a lot going on in our personal lives, be understanding of others situation. You have a chance to make a small impact every day you wake up. You get to choose if you want that impact to be positive or negative.

Creative Commons License

This work is licensed under a CC-BY 4.0 License. You are free to share and adapt, provided you give appropriate credit.