Heavy Fuel, Gasoline Engines & Wankel Rotary UAV Engines
SP-28 CR Two Stroke Engine Single-Cylinder UAV engine
SP-28 CR Two Stroke Engine

Single-Cylinder UAV engine

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SP-28 CR Two Stroke Engine

The 2-stroke single cylinder SP-28 CR with 28 ccm is the longest standing engine in our lineup and well known by industry veterans for its robustness and longevity for many years. The Sky Power SP-28 CR is still our most requested system and particularly suited for fixed wing aircraft on the upper end of the “below 55 lb” or “up to 25 kg” class UASs. The 3W-International SP-28 CR engine is equipped in the standard configuration with one spark plug and a single ignition unit. The carburetor is rear (CR) mounted.

The cylinder and crankcase are casted aluminum and have been manufactured in it’s current form for over a decade.

  • The carbureted version is the lightest and most robust engine in its class.
  • The carburetor adjusts automatically to the engine and environmental conditions.
  • Customers fly up to 24-28 hours with this configuration.
Type 1-Cylinder Gas Engine
Capacity 28 ccm / 1.71 cu in
Power 2.2 HP / 1.6 KW
Speed Range 2500 – 10000 RPM
Weight 2.95 lbs (1.34 kg) incl. ignition
Crankshaft 3 ball bearings
Oil/Gasoline ratio 1:50 / 2% mix
Operating Voltage 6 – 8.4 V DC
Bore diameter 1.42 inch (36.00 mm)
Stroke 1.10 inch (28.00 mm)
Torque 2.3 Nm @ 6600 RPM