introducing the SP-55 TS ROS: A Premier 2-Stroke Engine
The SP-55 TS ROS is a powerful 2-stroke, single-cylinder engine boasting a displacement of 55 ccm, making it the most substantial engine in our collection. Esteemed by industry experts for its durability and reliability,this engine has been a trusted choice for manny years. It features a dual spark plug design and a top-mounted carburetor, along with a rear output shaft (ROS) that facilitates the attachment of additional equipment. This innovative design positions the SP-55 TS ROS as one of the most compact single-cylinder engines available today.
Versatile Applications Across Various Aircraft
Customers utilize the SP-55 TS ROS engine in a range of applications, including fixed-wing aircraft, helicopters, and Vertical Take-Off and Landing (VTOL) systems, notably within the “below 55 lb” or “up to 25 kg” category of Unmanned Aerial Systems (UAS). Additionally, it is indeed employed in hybrid setups for electricity generation, showcasing its versatility in modern aviation technology.
Engine Specifications and Features
Constructed from cast aluminum, the cylinder has been in production in its current form for over ten years. The crankcase is meticulously CNC machined, allowing for customization to meet specific customer requirements.
| Engine type | Single-Cylinder Gas Engine |
| Displacement | 55 ccm / 3.35 cu in |
| Output Power | 3.9 HP / 2.9 KW @ 6500 RPM |
| RPM Range | 2200 – 10000 RPM |
| Weight (with ignition) | 5.68 lbs (2.58 kg) |
| Crankshaft Design | 4 ball bearings |
| Oil to Gas Ratio | 1:50 / 2% mix |
| operating Voltage | 6 – 8.4 V DC |
| Bore Size | 1.77 inch (45.00 mm) |
| Stroke Length | 1.38 inch (35.00 mm) |
| torque Output | 4.7 Nm @ 5500 RPM |
