Warner Scarab Junior

The Warner Scarab Junior was an American, five-cylinder, air-cooled, radial aero engine first produced in 1930. It was a scaled-down derivative of the seven-cylinder Warner Scarab, developing 90 hp (70 kW) against the Scarab's 110 hp (80 kW).

Scarab Junior
Type	Radial engine
Manufacturer	Warner Aircraft Corporation
First run	November 1930
Developed from	Warner Scarab

Applications

• Aeronca L
• Culver Dart
• Rearwin Sportster

Specifications (Warner Scarab Junior 50)

Data from FAA Type Certificate Data Sheet (TCDS).^[1]

General characteristics

• Type: Five-cylinder, air-cooled, radial piston engine
• Bore: 4.25 in (108 mm)
• Stroke: 4.25 (108 mm)
• Displacement: 301 cu in (4.93 L)
• Length: 14 in (35.5 cm)
• Height: 36.5 in (93 cm)
• Dry weight: 237 lb (107.5 kg)

Components

• Valvetrain: 1 inlet and 1 exhaust valve per cylinder
• Fuel system: 1 Holley carburetor
• Fuel type: 54 octane Avgas

Performance

• Power output: 90 hp (67 kW) at 2,050 rpm
• Compression ratio: 5.2:1
• Power-to-weight ratio: 0.38 hp/lb (0.62 kW/kg)

See also

Related development

• Warner Scarab

Comparable engines

• Armstrong Siddeley Genet
• Kinner K-5

Related lists

• List of aircraft engines