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KFM 107
Italian twin-cylinder aircraft engine From Wikipedia, the free encyclopedia
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The KFM 107 is a two-cylinder, two-stroke, single ignition, horizontally opposed aircraft engine designed for ultralight aircraft and motor gliders.[1][2]
The engine was designed and produced by the KFM (Komet Flight Motor) Aircraft Motors Division of Italian American Motor Engineering of Italy and has been out of production since 1986.[1][2]
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Development
The KFM 107 is a conventional twin-cylinder engine that is very compact and light weight at only 15.2 kg (34 lb) in its 107s version. The engine features single capacitor discharge ignition, a single Tillotson butterfly-type carburetor, integral fuel pump, tuned exhaust system and reed valve induction. It was offered with 2:1 belt drive reduction system. Starting is electric starter or recoil starter.[1][2]
Most versions of the 107 produce 25 hp (19 kW) at 6300 rpm for five minutes for take-off and 22.5 hp (17 kW) at 6080 rpm continuous.[1][2]
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Variants
- 107s
- "Standard" version, direct drive, recoil start, 25 hp (19 kW), weight 15.2 kg (34 lb)[2]
- 107e
- "Electric" version, direct drive, electric start and alternator 25 hp (19 kW), weight 19.1 kg (42 lb)[2]
- 107rs
- "Standard with Reduction" version, reduction drive, 25 hp (19 kW), weight 17.5 kg (39 lb)[2]
- 107er
- "Electric & Reduction" version, direct drive, 25 hp (19 kW), weight 21.4 kg (47 lb)[2]
- 107e Maxi
- Upgraded version with an OVC carburetor with fixed jets, 64 mm (2.52 in) stroke, 334 cc (20.38 cu in), 11:1 compression ratio, 2.1:1 or optional 2.55:1 reduction drive. Produces 30 hp (22 kW) at 6300 rpm for five minutes for take-off and 27 hp (20 kW) at 6080 rpm continuous.[3]
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Applications
Specifications (107s)
Data from Black[2]
General characteristics
- Type: Twin-cylinder, horizontally opposed, two-stroke aircraft engine
- Bore: 60 mm (2.36 in)
- Stroke: 52 mm (2.05 in)
- Displacement: 294 cc (17.94 cu in)
- Length: 432 mm (17.01 in)
- Width: 440 mm (17.32 in)
- Height: 353 mm (13.90 in)
- Dry weight: 15.2 kg (34 lb)
Components
- Valvetrain: reed valve induction
- Oil system: premixed 4% oil and fuel
- Cooling system: air cooled
- Reduction gear: none on the "s" model
Performance
- Power output: 25 hp (19 kW) at 6300 rpm for five minutes for take-off, 22.5 hp (17 kW) at 6080 rpm continuous
- Compression ratio: 10.5:1
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See also
References
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