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Quick answer
The RETROL VE-01 is a ready-to-run, manually started flame-eater with a visibly moving crossbeam and flywheel. It burns fuel at the cylinder opening to create a pressure difference; it is not a gasoline four-stroke or a sealed Stirling-cycle engine. Choose it for a tabletop mechanical demonstration, not for powering an RC vehicle.
Why this exact model?
Watch the beam transfer the piston's back-and-forth motion into flywheel rotation. The gallery shows the same red crossbeam assembly from the front, reverse and overhead, including a closer view of its moving linkage. Unlike an engine with a hidden crankcase, the mechanism is the main attraction. Supplier-listed construction combines metal parts with an acrylic display base.
Supplier-listed specifications
| Model | RETROL VE-01 |
|---|---|
| Operating principle | Vacuum / flame-eater; external heat at the intake |
| Starting and cooling | Manual start; air cooled |
| Supplier-listed fuel | 95% alcohol or anhydrous ethanol |
| Overall size | 21 × 10 × 13.5 cm |
| Supplier-listed weight | Approximately 1.1 kg |
Figures are supplier specifications for the named model, not independent performance measurements.
What is included—and what still needs checking?
The supplier describes the assembled engine and acrylic base as ready to run. Fuel and a safe burner arrangement should not be assumed to be included; confirm the precise box contents before purchase. Published operating-speed figures are supplier estimates, not a performance warranty.
First-run and safety considerations
Place the model on a stable, nonflammable surface with clearance around the flywheel. Follow the manufacturer's instructions for fuel placement, lighting and manual starting. Keep the alcohol container away from the flame, never refuel a hot engine, and allow metal parts to cool before handling. This is a supervised hobby model for ages 14+ according to the supplier, not an unsupervised children's toy.
Which nearby model should you compare?
If your interest is a sealed hot-air pumping mechanism with a water-cooling loop, compare the RETROL R01 pumping engine. For fuel-fired piston timing and ignition rather than an open flame at the cylinder, browse the working model-engine collection.
Frequently asked questions
Is this a Stirling engine?
No. A flame-eater draws hot gases at an opening and produces motion as the gas cools and pressure falls; the R01 is the closer choice for a closed-cycle hot-air demonstration.
Does it arrive assembled?
The supplier lists this VE-01 configuration as ready to run; check the setup sheet before the first firing.
Can it drive a model car or boat?
It is sold as a tabletop demonstration. No vehicle power output or mounting compatibility is promised.
What fuel should I prepare?
The supplier specifies 95% alcohol or anhydrous ethanol. Use only the fuel and lighting method described in the instructions, with appropriate fire precautions.
Before ordering
Match the model code to your use case; inspect the parts list, manufacturer instructions and local fuel rules. Supplier availability can change before fulfillment; contact EnginesDIY support if timing or an accessory is essential.
Source for manufacturer-specific specifications: EngineDIY supplier listing. Reviewed 23 September 2026.