Argus As 8

As 8
Argus As 8 aircraft engine
Type	Piston aircraft engine
Manufacturer	Argus Motoren

The Argus As 8 was a four-cylinder, air-cooled, inverted inline aircraft engine produced in Germany by Argus Motoren in the 1930s.

Variants

As 8A

Initial production version 71 kW (95 hp) maximum for 5 minutes, 60 kW (80 hp) continuous.

As 8B

A more powerful variant developing 101 kW (135 hp) maximum for 5 minutes, 86 kW (115 hp) continuous.

As 8R

A variant produced for sport aircraft, particularly for competition use, developing 110 kW (150 hp) for take-off. Featuring:

• Increased compression ratio, from 5.36 to 5.8
• Improved cooling by increasing the numbers of cooling fins at the cylinder head and the cylinder body
• Increasing the heat dispersing area of the pistons
• Improved crankcase and oil cooling
• Improved cylinder charging
• Modified valve timing

Applications

• Albatros L 100
• Albatros Al 101
• Arado L II (As 8A)
• Arado L IIa (As 8R)
• Baumgärtl Heliofly III
• BFW M.23
• BFW M.27
• BFW M.29
• BFW M.35
• Blohm & Voss Ha 136
• Comte AC-12 Moskito
• Darmstadt D-22
• DFS 40
• Focke-Wulf Fw 44
• Heinkel He 64
• Heinkel He 72
• Klemm L 25E
• Klemm Kl 32
• Raabb-Katzenstein RK.25/32
• Ruhrtaler Ru.3

Specifications (As 8B)

Data from

General characteristics

• Type: 4-cylinder inverted air-cooled in-line piston engine
• Bore: 120 mm (4.72 in)
• Stroke: 140 mm (5.51 in)
• Displacement: 6.333 L (386.46 cu in)
• Length: 1,075 mm (42.3 in) without airscrew hub
• Width: 470 mm (18.5 in)
• Height: 731 mm (28.8 in)
• Dry weight: 116 kg (256 lb) empty

Components

• Valvetrain: Overhead valves operated by pushrods and rockers
• Fuel system: One down-draught carburretor
• Fuel type: Aviation gasoline
• Oil system: Pressure feed
• Cooling system: Air-cooled

Performance

• Power output: 101 kW (135 hp) maximum for 5 minutes at 2200 rpm, 86 kW (115 hp) continuous at 2090 rpm.
• Compression ratio: 5.36:1
• Specific fuel consumption: 212 g/PSh at maximum, 236 g/PSh at continuous
• Oil consumption: 1.2 kg (2.6 lb) / h

See also

Comparable engines

• Alfa Romeo 110
• Blackburn Cirrus Major
• de Havilland Gipsy Major
• Elizalde Tigre IV
• Hirth HM 504
• Menasco C4

Related lists

• List of aircraft engines

References

Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 15.

• Das Virtuelle Luftfahrtmuseum
• Thomas Mildenberger. "Argus AS-8 R". Heinkel He 64. http://he64.com/. Retrieved 7 July 2011. {{cite web}}: External link in |publisher= (help)