Franklin 4AC

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The Franklin 4AC (US military designations O-150, O-170, O-175, and O-200) was a series of air-cooled aircraft engines of flat-4 configuration produced in the 1930s and 40s.

[edit] Variants

• 4AC-150 (O-150) - 40 hp (30 kW) at 1,875 rpm
• 4AC-171 (O-170) - 60 hp (45 kW) at 2,350 rpm
• 4AC-176 (O-175) - 65 hp (50 kW) at 2,300 rpm (models B, C), 80 hp (60 kW) at 2,500 rpm (models D, F)
• 4AC-199 (O-200) - 90 hp (67 kW) at 2,500 rpm (direct drive), 113 hp (60 kW) at 3,500 rpm (geared)

[edit] Applications

• Aeronca 50 Chief
• Aeronca Arrow
• Culver Cadet
• Fetterman Chickadee
• Goodyear Duck
• Interstate Cadet
• Langley Twin
• Payne MC-7
• Piasecki PV-2
• Piper Cub
• Piper PA-7
• Porterfield Collegiate
• Rearwin Skyranger
• Rose Parrakeet
• Sackett Jeanie
• Stinson 10
• Stout Skycar II
• Taylorcraft BF and L-2
• Vought-Sikorsky VS-300

[edit] Specifications (4AC-199, O-200)

General characteristics

• Type: 6-cylinder air-cooled horizontally opposed aircraft piston engine
• Bore: 4.25 in (108 mm)
• Stroke: 3.5 in (89 mm)
• Displacement: 199 in³ (3.3 L)
• Dry weight: 190 lb (86 kg)

Components

• Cooling system: Air-cooled

Performance

• Power output: 65 hp (50 kW) at 2,500 rpm
• Specific power:
• Power-to-weight ratio:

[edit] Reference

• Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p.57
• Erickson, Jack. Horizontally-Opposed Piston Aero Engines