KFM 107

KFM 107

KFM 107 engine on display
Type	Two-stroke aircraft engine
National origin	Italy
Manufacturer	Italian American Motor Engineering

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]

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]

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 carbutaror 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]

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

References

1 2 3 4 Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page G-5 Cybair Limited Publishing, 2001. ISBN 0-9680628-1-4
1 2 3 4 5 6 7 8 9 Black, Don & Margaret (August 2009). "KFM 107". Retrieved 2010-02-14.
↑ Black, Don & Margaret (August 2009). "KFM 107e Maxi". Retrieved 2010-02-14.

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