RETROL & OKMO N01 1/5 Scale Hit and Miss Vertical Gas Stationary Engine Model RTR - stirlingkit

RETROL & OKMO N01 1/5 Scale Hit and Miss Vertical Gas Stationary Engine Model RTR

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Artikelnummer: SK3726543

Product details

Retail Price

$560.00

Launching June 18, 2026

Sand-Cast Brass

CNC Machined Steel

Mechanical Trip Ignition

Hardwood Display Base

No Electronics

1,500 g · 3.3 lbs

// About This Engine

A Century-Old Cadence, Back on Your Desk

Between 1895 and 1930, the hit-and-miss stationary engine was the backbone of rural America.

Before electric motors reached the countryside, before tractors replaced draft animals, this single-cylinder machine did the work — powering cement mixers on construction sites, water pumps on homesteads, grain mills, sawmills, and feed grinders from coast to coast. Farmers depended on it. Contractors relied on it. It was everywhere.

What set it apart from every engine before or since was its governor. A centrifugal flyweight system that let the engine fire only when it needed to, and coast on pure flywheel inertia the rest of the time. That gave it its sound — that unmistakable clack — clack — clack that anyone who grew up around one never forgets.

Millions were built. Many are still running today, more than a century later.

The RETROL & OKMO N01 faithfully recreates that machine at 1/5 scale.

No plastic in the structural core. No electronics hiding the mechanism. Just sand-cast brass, precision-machined steel, a mechanical trip igniter, and dual heavy flywheels doing exactly what they did in 1900 — holding momentum through the miss, delivering power on the hit.

Every phase of the four-stroke cycle unfolds in full view. The open-crank architecture conceals nothing: piston, connecting rod, ignition points, glass drip oiler, steam hopper — all exposed, all working.

// How It Works

The Hit & Miss Cycle

HIT

Engine drops below set speed
Flyweights retract inward
Exhaust valve closes
Ignition points trip
Power stroke fires
Speed restored

MISS

Engine reaches set speed
Flyweights extend outward
Exhaust valve locks open
No compression · No ignition
Engine coasts on flywheel inertia
"clack — clack — clack"

The governor fires only when needed ⇄ Inertia carries the rest

// See It Run

Watch the Hit & Miss in Action

The centrifugal governor at work — flyweights extend on the miss, retract on the hit. No tricks. This is exactly what it sounds like on your desk.

// Specifications

Technical Specifications

// RETROL & OKMO N01 — Full Technical Data

Engine TypeHit-and-Miss ICE

Scale1 / 5

Displacement3.6 cc

Bore16.0 mm

Stroke19.0 mm

CycleFour-Stroke

Cylinder LayoutSingle-Cylinder, Vertical

Cooling SystemEvaporative Open-Hopper

Ignition SystemMechanical Trip-Point Igniter

Ignition Power1× AA 1.5V Battery (not included)

Spark Plug Thread3/16-40 Imperial (pre-installed)

Governor TypeCentrifugal Flyweight

LubricationFuel Pre-mix + External Drip Oiler

Fuel-to-Oil Ratio25:1 to 30:1

Recommended Fuel92+ Octane Gasoline

Recommended Oil2-Stroke or 4-Stroke 10W-50

Primary StructureSteel (CNC-Machined)

Decorative HardwareSand-Cast Brass + Aluminum

Surface FinishHigh-Temp Baked Enamel Coat

Display BaseHardwood (pre-mounted)

Overall Dimensions135 × 115 × 195 mm

Product Weight1,500 g (3.3 lb)

Assembly StatusRTR — Ready to Run

Starting MethodsManual Recoil / Electric Drill

// Features

Built Without Compromise

Cast + CNC Composite Construction

The structural core starts with premium sand-cast brass — the same process used on full-size industrial hardware — then every critical surface is finish-machined on a CNC center. Tighter tolerances, sharper edges, smoother bores. At 1.5 kg the heft is immediately apparent. This is a piece you pick up once and never put down.

Cast + CNC Composite Process

Fully Open-Crank Architecture

Every moving part is exposed. Watch the piston reciprocate, the connecting rod sweep, and the mechanical ignition points trip in real time. All four strokes unfold in front of you — intake, compression, power, exhaust. Nothing hidden, nothing sealed away.

Open Crank · No Cover Plates

Visible Glass Drip-Feed Oiler

A fully adjustable glass drip oiler delivers lubrication drop by drop to the crankshaft bearings — visible in real time. The same system that kept full-size early American stationary engines alive on the factory floor, now on your desk. Standard 10W-50 oil, no specialty products required.

Pre-mix + External Drip Oiler

Evaporative Hopper Cooling

The open-top water hopper absorbs combustion heat and releases a gentle mist of steam as it evaporates — exactly as it did in the field a century ago. Fill with tap or distilled water, top off for extended runs. No radiator, no pump, no closed loop required.

Open Hopper · Steam Venting

// Manufacturing Upgrade

We Heard You. We Fixed It.

⚙️

Cast + CNC. Not Cast Alone.

Early collectors were right to notice: pure casting leaves interior cavities rough, exterior edges soft, and bearing fits inconsistent. The N01 addresses this with a full CNC finishing pass across every critical surface after casting. The result is tighter bearing clearances, cleaner exterior geometry, and an engine that runs more quietly from the first start — not after a break-in period.

Tighter Tolerances · Quieter Running

🔩

Steel Where It Matters.

All-brass construction looks great at unboxing. It wears fast under load. Brass creeps under sustained stress and distorts with heat — which is why early miniature engines developed play in their bearings and lost compression over time. The N01's primary load-bearing components are machined from steel: harder, stronger, dimensionally stable across thousands of cycles. Brass stays where it belongs — as accent hardware and bearing surface.

Steel Core · No Long-Term Wear Creep

🎨

Finish That Lasts.

Early production used spray lacquer — which chips off flywheel edges, fades with heat, and looks worn within a season of running. The N01 uses a high-temperature baked enamel coat bonded directly to the steel substrate. It survives engine heat, vibration, and outdoor humidity without lifting or chalking. The color you receive is the color it keeps.

Baked Enamel · Weather-Resistant

🔧

Metal Sealing Ring. Not Rubber.

Early models used rubber O-rings as the primary cylinder seal. Rubber degrades with heat and fuel exposure — it swells, hardens, and eventually loses its seal, causing compression loss and oil leaks after extended use. The N01 replaces this with a precision-machined metal sealing ring: dimensionally stable at operating temperatures, chemically inert to gasoline and oil, and designed to maintain compression integrity across the long term.

Metal Ring · No Rubber Degradation

Specification Early Generation N01 Current Production

Primary Structure All-brass casting Steel — CNC-machined

Manufacturing Process Casting only Cast + CNC finish pass

Bearing / Assembly Fit Hand-fitted, inconsistent CNC-controlled, consistent

Surface Finish Spray lacquer High-temp baked enamel

Long-Term Wear Brass creep / bearing play Dimensionally stable steel

Weather / Heat Resistance Chips, fades over time Sealed, heat-bonded coat

Operating Noise Wider tolerances = more rattle Tighter fit, noticeably quieter

Cylinder Seal Rubber O-ring (degrades with heat & fuel) Precision metal sealing ring

Overall Quality Grade Entry-level collector 1–2 tiers above early gen

// Starting Methods

Two Ways to Wake It Up

Vintage Method

Manual Recoil Start

Wrap the included starter cord around the flywheel pulley and pull. The same ritual that started full-sized American farm engines on cold mornings — immediate mechanical feedback, no adapter, no batteries required.

Modern Method

Electric Drill Start

Chuck the included adapter rod into any cordless household drill, engage the starting shaft, and spin the engine to life in seconds. Ideal for quick demos, cold starts after storage, or fine-tuning the needle valve mid-session.

// Finishes

Three Period-Accurate Colorways

Each finish references a real tradition in American stationary engine history. All three share identical steel hardware, mechanical components, and hardwood display base. Click any image to view and order on the product page.

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Industrial Blue

Steam-era American machinery. Clean, workmanlike, factory-floor honest.

Classic

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Field Green

Deep farm green is the most historically resonant finish in early American stationary engine collecting. The classic color of the 1900–1930 era. Brass + hardwood + green = museum shelf.

Collector's Choice

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Barn Red

Early American factory red. Bold, warm, and unmistakably industrial.

Classic

// In the Box

Everything You Need to Run

⚙️

N01 Engine Assembly

With hardwood base & spark plug pre-installed

🔩

Drill Starting Adapter Rod

Fits standard cordless drills

🪢

Manual Recoil Cord & Handle

Included, ready to use

📖

Official User Manual

Tuning, fuel mix & first-run guide

⚠ Not included — you'll need:
1× AA 1.5V battery · 92+ octane gasoline · 10W-50 oil (2-stroke or 4-stroke)

// FAQ

Common Questions

Is it fully assembled when it arrives?+

Yes. The N01 is a true RTR (Ready-to-Run) build. The mechanical architecture, trip ignition system, and hardwood base are fully assembled and factory-tested before shipping. You only need 1× AA 1.5V battery and 92+ octane gasoline mixed with 10W-50 oil at a 25:1 to 30:1 ratio.

Do I need specialty oil for the drip oiler?+

No. Standard 2-stroke or 4-stroke 10W-50 motorcycle or automotive oil works for both the fuel pre-mix and the external drip oiler. One oil type covers both lubrication systems — no specialty products required.

How does the water cooling work?+

This replicates early "evaporative hopper cooling." Water sits in the open hopper above the cylinder, absorbs combustion heat, and steams off during operation. Fill with clean tap or distilled water before starting and top off for extended sessions. No plumbing, no pump, no closed circuit needed.

Can the engine speed be adjusted?+

Yes. The centrifugal flyweight governor sets the target RPM automatically — the hit-and-miss logic then fires or coasts to maintain that speed. You can fine-tune the governor setting and the carburetor needle valve to adjust how frequently the engine fires, giving you direct control over both speed and the cadence of the "miss" rhythm.

How long can it run on a single fill?+

Runtime depends on your governor setting and ambient conditions. The fuel tank is sized for desktop demonstration runs — typically 10–20 minutes per fill at normal operating cadence. The water hopper holds enough for a similar duration. For extended display sessions, top both off periodically. No minimum warm-up time is required.

Is needle valve tuning difficult for beginners?+

Not at all. The carburetor needle valve and mechanical ignition timing are pre-set to optimal baseline at the factory before shipping. For most users the engine fires straight out of the box. If you want to fine-tune the "miss" cadence for your altitude or ambient temperature, the included Official User Manual walks through every adjustment step by step.

— RETROL × OKMO · N01 · 1/5 Scale Hit-and-Miss Engine —

AVAILABLE
JUNE 18, 2026

RTR · Factory-Tested · Shipped in Custom Shockproof Carton
Steel + Brass + Aluminum · High-Temp Baked Enamel · Hardwood Base

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Ships from Sep 15, 2026 · Pre-order to lock in your price