The Rotax 277 is a 26 hp (19 kW), single-cylinder, two-stroke aircraft engine, that was built by BRP-Rotax GmbH & Co. KG of Austria for use in ultralight aircraft.^[1][2]

Development

The Rotax 277 features a single piston ported, air-cooled cylinder head and cylinder, utilizing either a fan or free air for cooling. Lubrication is pre-mixed fuel and oil. The 277 has a single Bosch flywheel magneto generator 12 volt ignition system and is equipped with a 36 mm Bing double float carburetor, with either a hand lever or cable choke.^[1][2]

The Rotax 277 is no longer in production.^[1]

Applications

Specifications (277)

Data from ROTAX 277 UL Data Sheet^[1]

General characteristics

• Type: two-stroke air-cooled aeroengine
• Bore: 72 mm (2.83 in)
• Stroke: 66 mm (2.60 in)
• Displacement: 268.7 cc (16.40 cu in)
• Dry weight: 29.5 kg (65 lb) (complete including reduction drive and exhaust system)

Components

• Valvetrain: piston ports
• Fuel system: pneumatic pump pressurized
• Fuel type: premium unleaded autofuel
• Oil system: premixed in the fuel at 50:1
• Cooling system: fan or free air

Performance

• Power output: 19 kW (26 hp) at 6250 rpm
• Compression ratio: Theoretical 11.8, effective 6.7
• Power-to-weight ratio: 0.64 kW/kg (0.40 hp/lb)