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Continental A40

 

  Cont-A40
Continental A40

 

The 37 hp (28 kW) A40 was introduced in the depths of the Great Depression. At the time there were a number of small engines available but all suffered from either high cost, complexity, or low reliability. A carbureted four-cylinder, horizontally opposed, air-cooled aircraft engine, it was developed especially for use in light aircraft.  The A-40 addressed all those shortcomings and was instrumental in the production of light aircraft in the difficult economic constraints of the period. The A-40-4 introduced an increase in power to 40 hp (30 kW). The engine later inspired the A-50 and subsequent engines.

 

The A40 featured single ignition until the A-40-5 version, which introduced dual ignition. All engines in this family have a 5.2:1 compression ratio and were designed to run on fuel with a minimum octane rating of 73.

 

Produced between 1931 and 1941, the entire family of engines had its certification terminated on 1 November 1941. Engines produced before that date are still certified, but none can be produced after that date.

 

Variants:

A40
Single ignition, 37 hp (28 kW) at 2550 rpm, dry weight 144 lb (65 kg)

A40-2
Single ignition, 37 hp (28 kW) at 2550 rpm, dry weight 144 lb (65 kg)

A-40-3
Single ignition, 37 hp (28 kW) at 2550 rpm, dry weight 144 lb (65 kg) Featured cadmium-nickel connecting rod bearings.

A40-4
Single ignition, 40 hp (30 kW) at 2575 rpm, dry weight 144 lb (65 kg), Steel backed connecting rod inserts

A40-5
Dual ignition, 40 hp (30 kW) at 2575 rpm, dry weight 156 lb (71 kg)

 

Applications:
Aeronca KC
Piper J-2 Cub
Piper J-3 Cub
Porterfield Collegiate
Rose Parakeet
Taylor E-2 Cub
Taylorcraft A
Welch OW-5M

 

Specifications:

A40-5
Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
Bore: 3.125 in (79.3 mm)
Stroke: 3.75 in (95.3 mm)
Displacement: 115 in³ (1.9 L)
Length: 27.9375 in (710 mm)
Width: 26.4375 in (672 mm)
Height: 20.4375 in (519 mm)
Dry weight: 154 lb (69.9 kg) dry with carburrettor and magnetos
Valvetrain: One intake and one exhaust side-valve per cylinder with a flathead valve design.
Fuel system: CMC Stromberg NA-82 carburetor
Fuel type: minimum 73 octane
Cooling system: Air-cooled
Power output: 40 hp (30 kW) at 2,575 rpm
Specific power: 0.35 hp/in³ (15.3 kW/L)
Compression ratio: 5.2:1
Specific fuel consumption: 0.72 lb/hp/hr (0.439 kg/kW/hr)
Oil consumption: 0.025 lb/hp/hr (0.0153 kg/kW/hr)
Power-to-weight ratio: 0.28 hp/lb (0.45 kW/kg)

 

 


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