Sauer S 2500 UL

The Sauer S 2500 UL and Sauer S 2500 ULT are four-stroke aircraft engines for homebuilt aircraft^[1][2]

Sauer S 2500UL
Type	Horizontally opposed piston engine
National origin	Germany
Manufacturer	Sauer Flugmotorenbau GmbH
Major applications	Experimental Aircraft
Developed from	Volkswagen Wasserboxer engine

Design and development

The engines are based on the Volkswagen Wasserboxer engine. They are extensively modified for aircraft use and all the parts are custom made. These engines are derived from the certified engines produced by the same manufacturer and used in several motorgliders and light aircraft.^[1]

Variants

• Sauer S 2500 UL
• Sauer S 2500 ULT

Applications

• Homebuilt aircraft

Specifications (variant)

General characteristics

• Bore: 97mm
• Stroke: 84mm
• Displacement: 2483cc
• Dry weight: 74-83 kg

Components

• Valvetrain: Single overhead exhaust valve, single overhead inlet valve per cylinder
• Fuel system: Bing carburetor with altitude compensation
• Fuel type: min 98 RON
• Cooling system: Air-cooled

Performance

• Power output: 100hp at 3000 rpm, 126hp at 3000 rpm (turbo)
• Compression ratio: 9:1, 8:1 (turbo)

See also

Sauer engines