Available Options
Ask a Question About This Product
Quick answer
The RETROL R01 is a 1:12-scale external-combustion hot-air pumping-engine model with a visible flywheel and water-circulation cooling. Its heat source uses butane according to the supplier. Golden and Blue are finish choices at the same listed store price; select the desired color before checkout.
Why this hot-air model?
Unlike a gasoline internal-combustion model, R01 uses heat applied externally to a hot-air mechanism. Its gallery shows the upright brass-looking pump linkage, flywheel, base and tank from several sides and a composite of close-up details. The gallery now includes supplier photographs of both Golden and Blue finishes. Select the desired finish before checkout; small finish details may vary by production batch.
Supplier-listed specifications
| Model / scale | RETROL R01 / 1:12 |
|---|---|
| Energy source | External butane heat source, per supplier |
| Cooling | Water-pump circulation |
| Supplier-listed cylinder / stroke | 13 mm / 24 mm |
| Supplier-listed size | 12.5 × 7.5 × 12.8 cm |
| Finish selection | Golden or Blue |
These are supplier figures. Both Golden and Blue versions are pictured; listed speed is not a store performance guarantee.
Package and supplies to prepare
The supplier pack list names one engine and one manual. Butane, water and separate filling or ignition tools should not be assumed to come in the box. Check the selected finish on the cart line before paying; the gallery includes both Golden and Blue supplier photographs.
First-run and safety considerations
The manufacturer describes filling the water circuit and lighting the external butane burner before manually turning the flywheel. Do not improvise a fuel-fill or lighting sequence from photographs. Use a stable nonflammable surface, ventilation and leak checks; keep hands away from the burner and hot cylinder. Confirm water level and circulation during operation, then allow the assembly to cool before storage.
Which external-combustion mechanism?
For a flame-eater that directly admits hot gases at a cylinder port, compare the RETROL VE-01. For other tabletop external-combustion models, browse the Stirling and hot-air category. These mechanisms are not equivalent to gasoline V-twins or steam boilers.
Frequently asked questions
Is R01 powered by gasoline?
No. Its supplier describes an externally heated butane hot-air model.
Why does it need water?
The supplier specifies a water-circulation cooling loop, separate from the external burner.
Is the Blue finish shown in the gallery?
Yes. The additional images include two supplier photographs of the Blue version alongside Golden views. Minor finish details may vary by batch.
Does the package include butane?
Butane is not in the supplier pack list; prepare the appropriate fuel only as instructed by the manufacturer.
Before ordering
Confirm the exact finish, required safe heat source and current supplier availability. The selected option in the cart defines the version purchased.
Model and package source: EngineDIY R01 listing. Reviewed 23 September 2026.