ProBuild Aircraft Ltd are the original and longest-running Official UK Distributor and UK Service Centre for GP Engines, supplying genuine factory-direct products with full manufacturer support, expert technical advice and access to genuine GP spare parts and accessories.

The Great Power GP-38 Gas Engine delivers exceptional reliability and strong performance for a wide range of RC aircraft. With a 38cc displacement and 5 horsepower output, it strikes the perfect balance between power and efficiency, ideal for small to mid-size models that demand precision, smooth throttle response, and dependable operation.

Running smoothly across a broad RPM range of 1400–10,000, the GP-38 is equally at home in relaxed sport flying and high-energy aerobatics. The Walbro HDA-246 carburettor and NGK CM-6 spark plug ensure consistent combustion, easy starts, and efficient fuel delivery.

Built for long-term durability, the GP-38 operates on a 40:1 unleaded gasoline/oil mix, offering smooth, low-vibration performance. Included mufflers reduce noise while maintaining strong exhaust flow. Backed by a 2-year Probuild Aircraft Ltd warranty, the GP-38 combines performance, reliability, and value in one compact package.

Key Features

✅ 38cc displacement delivering 5 horsepower
✅ Smooth and reliable performance across 1400–10,000 RPM
✅ Walbro HDA-246 carburettor for precise fuel control
✅ NGK CM-6 spark plug for consistent ignition
✅ Lightweight and fuel-efficient design
✅ Operates on 89–92 unleaded gasoline (40:1 mix)
✅ Includes mufflers
✅ 2-year warranty by Probuild Aircraft Ltd

Recommended Propellers

• 20x8 (2-blade)

• 20x9 (2-blade)

• 20x10 (2-blade)

• 21x8 (2-blade)

Perfect For

• Small to mid-size RC aircraft

• Aerobatic and sport flying

• Pilots seeking smooth throttle response and long-term reliability

• Builders upgrading to a compact, fuel-efficient gas engine

Product Summary

The Great Power GP-38 Gas Engine combines power, efficiency, and smooth operation in a compact design. With its wide RPM range, reliable ignition, and precision engineering, it’s the perfect choice for pilots who want dependable performance and easy maintenance flight after flight.

Why Buy from Probuild Aircraft Ltd

✅ Official UK Great Power Engines Stockist
✅ 100% Genuine Products
✅ Trusted by Top International Pilots
✅ Fast, Reliable UK Shipping
✅ Supporting RC Pilots Since 1993