The UMS 5-Cylinder 150cc Petrol Radial Engine is a compact, precision-engineered 4-stroke powerplant designed for scale aircraft builders who want authentic radial appearance, smooth power delivery, and dependable reliability. Supplied ready to run and CNC-machined from aircraft-grade materials, this engine delivers classic radial sound and performance in a lighter, more versatile package.

Product Description

The UMS 5-Cylinder 150cc Radial Engine is engineered to strike the perfect balance between scale realism, performance, and ease of use. Its classic 5-cylinder radial configuration provides smooth, balanced operation while closely replicating the look and sound of full-size aviation engines.

With a 150cc displacement, this engine is ideal for medium-scale warbirds, vintage aircraft, and detailed scale projects where weight, realism, and reliability are equally important. Delivered ready to run, it includes an exhaust collector ring, electronic ignition, spark plugs, and a robust engine mount, allowing for quick installation and straightforward setup.

All major components are precision CNC-machined from aircraft-grade aluminium and bar stock, ensuring tight tolerances and consistent performance. The cylinder heads and crankcases use high-strength aluminium alloys to provide durability without unnecessary weight. A heavy-duty double-bearing crankshaft enhances smoothness and longevity during sustained operation.

Internally, billet aluminium pistons with hardened steel rings improve efficiency and compression, while hard-chromed and lapped cylinder bores reduce wear and extend service life. Hardened steel camshafts ensure precise valve timing and long-term reliability.

Designed to run on 87–110 octane petrol with a 32:1 fuel-to-oil mixture, the UMS 5-150cc radial engine is practical, economical, and engineered for real-world flying conditions. It is an excellent choice for builders seeking authentic scale presence, refined engineering, and dependable 4-stroke performance.

Key Features

• 5-cylinder 4-stroke radial engine with authentic scale appearance

• 150cc displacement delivering smooth, dependable power

• Ready-to-run package including ignition, plugs, exhaust collector ring & engine mount

• Precision CNC-machined aircraft-grade aluminium and bar stock construction

• Aircraft-grade alloy cylinder heads and crankcases

• Heavy-duty double-bearing crankshaft for smooth, stable operation

• Billet aluminium pistons with hardened steel piston rings

• Hard-chromed and lapped cylinder bores for reduced wear

• Hardened steel camshafts for accurate valve timing

• Integrated choke and throttle bellcranks for easy installation

• Compatible with 87–110 octane petrol (32:1 fuel mix)

Perfect For

• Scale RC warbirds and vintage aircraft

• Medium-scale aircraft and replica builds

• Builders seeking realistic radial sound and appearance

• Smooth, reliable 4-stroke petrol power

• Advanced hobbyists and professional aircraft modellers

Specifications

Engine Type: 4-Stroke
Cylinders: 5 (ABC Type)
Displacement: 150cc
Bore: 35.7mm
Stroke: 31mm
Approx. Thrust: 18.5kgf @ 30×10 prop
RPM Range: 1,000 – 5,500
Weight (with silencer & ignition): Approx. 5.1kg
Engine Diameter: 260mm
Engine Length: 177mm
Recommended Propellers:

• 2-Blade 28×10

• 2-Blade 30×10

• 2-Blade 30×12
  

Muffler Type: Collector Ring
Spark Plug: CM6
Carburettor: Walbro
Fuel Type: Petrol (87–110 octane, 32:1 mix)

Why Buy from Probuild Aircraft

✅ Official UK stockist – 100% genuine UMS engines
✅ Trusted by top international pilots and builders
✅ Fast UK shipping and secure packaging
✅ Supplying and supporting pilots since 1993

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