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Quick answer
This is the silver ENJOMOR low-temperature Stirling model with visible gear transmission. It is intended to run from the temperature difference between a hot-water cup and surrounding air, rather than an alcohol flame. The brass gear train makes the movement of the low-temperature engine easy to observe. This listing is for the silver variant only; the gold finish is a separate supplier option and is not included.
How the mechanism works
In a gamma-type Stirling engine, a displacer shifts enclosed air between warm and cool regions. Expansion and contraction create pressure changes that drive the power piston. The linkage turns a flywheel, while the exposed gears transmit and display that motion. The model is educational, not a generator or practical power source.
Specifications to check
- Supplier-listed dimensions: approximately 9 × 9 × 11.5 cm.
- Supplier-listed weight: approximately 145 g.
- Materials: aluminum alloy and brass.
- Variant: silver body with exposed brass gear transmission.
- Heat source: a cup of hot water; the supplier recommends water at or above about 90°C.
Getting started
- Set a stable, heat-resistant cup on a level surface away from the edge of a table.
- Pour hot water carefully, leaving room so the cup will not overflow when the model is placed on top.
- Center the engine’s base on the cup as instructed by the supplier; keep hands clear of the hot rim and moving gears.
- If it does not start, allow the temperature difference to establish and gently check for free movement only when it is safe to touch.
- Let the cup and engine cool before lifting, cleaning or storing.
Safety and limitations
Water near 90°C can cause serious scalds. Adults should handle the hot water and supervise demonstrations. Keep children, pets and loose clothing away from the cup and exposed gear train. Do not seal the cup, leave it unattended, or assume the engine will run at a fixed speed or duration: ambient temperature, water temperature, cup fit and friction all matter. No flame is required for the intended coffee-cup demonstration.
Frequently asked questions
Does the kit need an alcohol burner?
No. This low-temperature model is designed for a hot-water cup.
Will ordinary warm coffee run it?
It may not. The supplier recommends water around 90°C or hotter to create a sufficient temperature difference.
Is this the gold version?
No. This listing covers the silver variant shown in the photos.
Can the gears pinch fingers?
Yes. Keep fingers and loose material clear while the mechanism is moving.
Does it charge a device?
No electrical output or charging capability is claimed.