MWfly B25

Last updated

B25
Type Aircraft engine
National origin Italy
Manufacturer MWfly srl
Unit cost €21,900 (B25R model, 2015)
Developed from MWfly B22

The MWfly B25 is a family of Italian aircraft engines, designed and produced by MWfly of Passirana di Rho for use in light aircraft. [1]

Italy republic in Southern Europe

Italy, officially the Italian Republic, is a country in Southern Europe. Located in the middle of the Mediterranean Sea, Italy shares open land borders with France, Switzerland, Austria, Slovenia and the enclaved microstates San Marino and Vatican City. Italy covers an area of 301,340 km2 (116,350 sq mi) and has a largely temperate seasonal and Mediterranean climate. With around 61 million inhabitants, it is the fourth-most populous EU member state and the most populous country in Southern Europe.

Aircraft engine Engine designed for use in powered aircraft

An aircraft engine is a component of the propulsion system for an aircraft that generates mechanical power. Aircraft engines are almost always either lightweight piston engines or gas turbines, except for small multicopter UAVs which are almost always electric aircraft.

Rho, Lombardy Comune in Lombardy, Italy

Rho is a town and comune (municipality) in the Metropolitan City of Milan in the Italian region of Lombardy, located about 14 kilometres northwest of Milan.

Contents

Design and development

The B25 series are all four-cylinder four-stroke, horizontally-opposed, 2,500 cc (152.6 cu in) displacement, liquid-cooled, gasoline engine designs. They all employ dual electronic ignition systems and have a compression ratio of 10.5:1. [1]

Compression ratio the ratio of the volume of a combustion chamber from its largest capacity to its smallest capacity

The static compression ratio,, of an internal combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its largest capacity to its smallest capacity. It is a fundamental specification for many common combustion engines.

Variants

B25D
Direct drive model with an output of 115 hp (86 kW) at 3300 rpm or 155 hp (116 kW) at 4700 rpm. [2]
B25G
Geared model with a mechanical gearbox reduction drive with a reduction ratio of 1.731:1 or 1.958:1 and an output of 140 hp (104 kW) at 4000 rpm or 155 hp (116 kW) at 4700 rpm, respectively. [2]
B25R
Model with a helical gear mechanical gearbox reduction drive with a reduction ratio of 1.731:1 and an output of 150 hp (112 kW) at 4550 rpm. By March 2018 the engine was no longer advertised on the company website and seems to be out of production. [1] [2]

Specifications (B25R)

Data from Tacke [1]

General characteristics

Components

  • Fuel type: gasoline
  • Cooling system: liquid
  • Reduction gear: helical gear mechanical reduction drive
Propeller speed reduction unit

A propeller speed reduction unit is a gearbox or a belt and pulley device used to reduce the output revolutions per minute (rpm) from the higher input rpm of the powerplant. This allows the use of small displacement internal combustion automotive engines to turn aircraft propellers within an efficient speed range.

Performance

See also

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References

  1. 1 2 3 4 Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, pages 260-261. Flying Pages Europe SARL, 2015. ISSN   1368-485X
  2. 1 2 3 MWfly. "B25 AeroPower Series". www.mwfly.it. Retrieved 29 March 2018.
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