Alfa Romeo 115

The Alfa Romeo 115 was an Italian 6-cylinder air-cooled inverted inline engine for aircraft use, mainly for training and light planes, based on the de Havilland Gipsy Six engine. Production totalled approximately 1,600 units. Derivatives of the 115 include the -1, bis, ter and Alfa Romeo 116.[1]

Alfa Romeo 115
Alfa Romeo 115
Type Piston aircraft engine
Manufacturer Alfa Romeo
First run 1930s
Number built 115 ~1,600

Description

The Alfa Romeo 115 series of engines closely follows the original de Havilland Gipsy Six engines in having 1-piece Elektron casting crankcases with cover plates, steel cylinders, finned for cooling, and detachable aluminium alloy cylinder heads. The 6-throw 1-piece counterbalanced crankshaft is carried in seven plain journal bearings and the propeller is driven directly by the crankshaft.

Variants
110ter
4-cylinder version of the 115ter
115-1 (115-I)
115bis (115-2 / 115-II)
115ter (115-3 / 115-III)
116-1 (116-I)
The 115 bored out to 120 mm (4.72 in) developing 164.05 kW (220 hp) at 2,360 rpm, otherwise similar.[1][2]

Applications
The Alfa 155ter displayed at Museo dell'aria e dello spazio of San Pelagio, Due Carrare, province of Padua, Italy.

Specifications (115-1)

Data from Jane's All The World's Aircraft 1938[2] Italian Civil and Military aircraft 1930–1945[1] Aircraft Engines of the World 1945[4]

General characteristics

  • Type: six-cylinder inverted air-cooled inline engine
  • Bore: 118 mm (4.65 in) (115), 120 mm (4.72 in) (116-1)
  • Stroke: 140 mm (5.51 in)
  • Displacement: 9.187 l (560.63 cu in) (115), 9.5 l (579.73 cu in) (116-1)
  • Length: 1,642 mm (64.65 in)
  • Width: 498 mm (19.61 in)
  • Height: 825 mm (32.48 in)
  • Dry weight: 210 kg (462.97 lb) (115-1), 223 kg (491.63 lb) (115ter)
  • Frontal Area: 0.35 m2 (3.8 sq ft)

Components

  • Valvetrain: Two valves per cylinder, sodium-cooled exhaust valves
  • Fuel system: Two Mona-Hobson AI48D downdraught carburettors with mixture control
  • Fuel type: 73 octane
  • Oil system: 275.8–310.3 kPa (40–45 psi), dry sump with one pressure and three scavenge pumps.
  • Oil grade (viscosity): 20.5 cs (100 S.U. secs)

    • Oil consumption: 0.01095 kg/(kW h) (0.018 lb/(hp h))
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive
  • Starter: Hand starter
  • Ignition: 2x Marelli magnetoes, 2x 14 mm (0.55 in) short reach spark plugs per cylinder.

Performance

  • Power output:
  • Maximum power (115-1): 152.87 kW (205 hp) at 2,350 rpm
    • Maximum power (115bis): 145.41 kW (195 hp)
      • Maximum power (115ter): 167.78 kW (225 hp) at 2,350 rpm with 100/130 Octane fuel
        • Maximum power (116-1): 164.05 kW (220 hp) at 2,360 rpm
          • Normal (115-1): 145.41 kW (195 hp) at 2,200 rpm
            • Normal (115ter): 160.33 kW (215 hp) at 2,100 rpm with 100/130 Octane fuel
              • Normal (116-1): 156.60 kW (210 hp) at 2,250 rpm
                • Cruising (115-1): 104.40 kW (140 hp) at 1,500 rpm
  • Compression ratio: 6.5:1
  • Specific fuel consumption: 0.322 kg/(kW h) (0.53 lb/(hp h)) (take-off)
  • Oil consumption: 0.011 kg/(kW h) (0.018 lb/(hp h))
  • Power-to-weight ratio: 0.727 kW/kg (0.4425 hp/lb)
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See also

Comparable engines

Related lists

Notes
  1. Thompson, Jonathan W. (1963). Italian Civil and Military aircraft 1930–1945. USA: Aero Publishers Inc. p. 295. ISBN 0-8168-6500-0. LCCN 63-17621.
  2. Bridgman, Leonard (ed.) (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd. pp. 67d–68d.CS1 maint: extra text: authors list (link)
  3. "Fiat G.46 4B". pilotfriend.com. Archived from the original on 27 September 2007. Retrieved 2007-08-28.
  4. Wilkinson, Paul H. (1945). Aircraft engines of the World 1945 (2nd ed.). New York: Paul H. Wilkinson. pp. 284–285.

References
  • Bridgman, Leonard (ed.) (1953). Jane's All The World's Aircraft 1953-54. London: Jane's.CS1 maint: extra text: authors list (link)
  • Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 9.
  • Bridgman, Leonard (ed.) (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd. pp. 67d–68d.CS1 maint: extra text: authors list (link)
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