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 its current form for over a decade. One customer is running this propulsion system for 10+ years and accumulated more than 1,000,000 flight hours, it is a reliable work horse in all operational scenarios.
| Type | 1-Cylinder gas engine |
|---|---|
| Capacity | 28 ccm / 1.71 cu in |
| Power | 2.2 hp / 1.6 kW @ 6600 rpm |
| 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 |
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