“Real Engineers Build, Not Code”: YouTuber Ignites Firestorm by Powering Bike With 200-Year-Old Heat Tech and Mocking Modern Innovation

Imagine a bicycle propelled by nothing more than the power of heat—no emissions, no noise, just pure thermodynamic innovation. This is not a fantasy but a reality brought to life by aerospace engineer and YouTuber Tom Stanton. Over the span of two months, Stanton meticulously documented his journey of transforming a simple Stirling engine, a technology first patented in 1816, into a functional bicycle engine. Through his detailed 18-minute video, viewers are taken on a riveting journey from initial experiments to the final test ride, providing an in-depth look at how this age-old concept could potentially revolutionize modern transport.

Transforming a Desktop Model into a Bicycle Engine

In the beginning, Stanton starts with a simple glass syringe heated to demonstrate the basic principle of a Stirling engine. The trapped air expands, pushing the plunger outward—a miniature version of what he plans to build. From this, Stanton aims to scale up to a full-sized engine capable of fitting within a bicycle frame, delivering approximately 100 to 150 watts of power, enough for a speed of about 15 miles per hour on flat terrain. The journey from this small model to a frame-filling engine is filled with challenges and breakthroughs.

The main engine block is crafted from aluminum, a material chosen for its lightweight and strength properties, while the hot cap is made of steel to withstand high temperatures. Initially, Stanton considers using a computer CPU heatsink for cooling but soon discards the idea due to insufficient contact area. Instead, he opts for an internal water-cooling loop to manage the heat effectively. Friction is another significant obstacle, as even minor losses could drastically affect the engine’s performance. To mitigate this, Stanton uses low-friction PTFE rings for the power piston and employs linear bearings from 3D printer hardware to center the displacer rod.

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Tackling Leaks, Friction, and Compression Challenges

Stanton faces several setbacks during the initial tests. Despite the hot cap glowing and the water-cooled end maintaining a temperature of about 104°F, the engine fails to start. A thorough examination reveals issues with silicone gaskets and the displacer-shaft O-ring, prompting Stanton to experiment with various piston ring designs. The initial PTFE rings allow excessive blow-by, so he attempts to use a rubber O-ring but finds it causes too much drag.

Eventually, he designs a flexible piston ring made from TPU, which seals effectively without increasing friction. This improvement is evident when the piston rebounds upon hand-cranking, indicating that pressure is being retained. However, another problem arises: the crank’s 30-millimeter throw exceeds the air’s efficient expansion range. By shortening the crank to 25 millimeters and lengthening the displacer stroke, Stanton optimizes air movement between the hot and cold zones, allowing the engine to run smoothly and almost silently on a small burner.

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Realizing the Potential and Limitations

With the engine operational, Stanton makes further refinements, such as thinning the timing belt to reduce bending losses and replacing the rear-wheel drive pulley with a flywheel. These changes enable the engine to gather momentum before engaging the drivetrain. Despite these enhancements, the prototype remains a low-power novelty. It requires a long warm-up time, delivers limited torque, and lacks easy throttle control.

Stanton identifies several areas for future development: adding a regenerator to recycle heat, pressurizing the working air to increase output, completing a radiator-based cooling loop, and integrating a clutch for practicality. While not intended as a direct competitor to electric bicycles, Stanton’s project highlights how modern hobbyist tools like 3D printing and CNC services can breathe new life into historical technologies.

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The Future of Thermodynamic Transportation

The significance of Stanton’s work extends beyond just a fascinating engineering project. It underscores the potential of Stirling engines as a sustainable and silent alternative to conventional motors. The project also serves as a testament to how modern technology can revive and adapt ancient concepts for contemporary use. As the video concludes with the engine still spinning, powered solely by the heat stored in its steel cap, one can’t help but wonder about the possibilities this technology holds.

In a world increasingly focused on reducing carbon footprints and exploring sustainable energy sources, could heat-powered engines find their place in mainstream transportation? Will Tom Stanton’s innovative project inspire others to explore the untapped potential of thermodynamic engines? The future remains open to those willing to explore these questions.

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