O.S. Engines GF40 with F-6040 reso (39400)

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Product details

The O.S. GF 40 combines the user-friendliness and efficiency of a traditional 4-stroke engine with a gasoline engine. Its quick and powerful response is ideal for scale, sport, and aerobatic models. The mounting points are identical to those of the GT 33 2-stroke engine. The carburetor was developed by O.S. in collaboration with Walbro® specifically for this engine.

Technical specifications:

  • Cooling: Air
  • Width [mm]: 83.7 mm
  • Shaft thread: UNF-5/16-24
  • Mounting holes lengthwise [mm]: 54 mm high
  • Carburetor: WT GF 40
  • Total weight [g]: 1378 g
  • Height approx. [mm]: 157.2 mm
  • Mounting hole Ø [mm]: 5.2 mm
  • RPM range approx.: 1800 - 9000 RPM
  • Bore [mm]: 40 mm
  • Mounting holes crosswise [mm]: 70 mm
  • Displacement [ccm]: 39.96 cm³
  • Power kW (HP) at: 3.75 at 9000 RPM
  • Recommended propeller: 18x8 - 20x10
  • Length to hub: 118.5 mm
  • Stroke [mm]: 31.8 mm
  • Shaft Ø [mm]: 7.8 mm
  • Brand name: O.S.
  • Application area: Model aircraft
  • Includes muffler: Yes
  • Fuel: Gasoline
  • Design: 4-stroke gasoline
  • Manufacturer's article number: OS39400
  • The O.S. GF40 engine operates with "regular" gasoline mixture 1:25.

Key specifications

Engine type
Internal combustion engine
Cubic capacity
39.96 cm3
stovepipe hat
40
Wavelength
7.80 mm
shaft diameters
7.80 mm
Max. Speed
9000 rpm
Item number
630880

General information

Manufacturer
O.S. Engines
Category
RC motors
Manufacturer no.
39400
Release date
16/11/2012

Engine properties

Engine type
Internal combustion engine
Internal combustion engine type
4-stroke
Cubic capacity
39.96 cm3
stovepipe hat
40
Wavelength
7.80 mm
shaft diameters
7.80 mm
Max. Speed
9000 rpm

Speed controller features

usableness
Aeroplane

Voluntary climate contribution

CO₂-Emission
Climate contribution

Product dimensions

Length
11.85 cm
Width
8.37 cm
Height
15.72 cm
Diameter
40 mm
Weight
1378 g

Package dimensions

Length
30.50 cm
Width
25.80 cm
Height
15 cm
Weight
1.99 kg

14-day cancellation right
30-day right of return
24 Months statutory warranty

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Reviews & Ratings

Statutory warranty score

How often does a product of this brand in the «RC motors» category have a defect within the first 24 months?

Source: Galaxus
  • O.S. Engines
    Not enough data
  • 1.Reely
    0 %
  • 1.Velleman
    0 %
  • 3.Tamiya
    0,8 %
  • 4.Hobbywing
    0,9 %

Statutory warranty case duration

How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?

Source: Galaxus
  • O.S. Engines
    Not enough data
  • 1.Hobbywing
    2 days
  • Reely
    Not enough data
  • Tamiya
    Not enough data
  • Velleman
    Not enough data

Return rate

How often is a product of this brand in the «RC motors» category returned?

Source: Galaxus
  • O.S. Engines
    Not enough data
  • 1.Velleman
    0 %
  • 2.Tamiya
    1,8 %
  • 3.Hobbywing
    1,9 %
  • 4.Wilesco
    3,3 %
Source: Galaxus