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 |
