MWfly B25 explained

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]

Design and development

The B25 series are all four-cylinder four-stroke, horizontally-opposed, 25001NaN1 displacement, liquid-cooled, gasoline engine designs. They all employ dual electronic ignition systems and have a compression ratio of 10.5:1.[1]

Variants

B25D
  • Direct drive model with an output of 1150NaN0 at 3300 rpm or 1550NaN0 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 1400NaN0 at 4000 rpm or 1550NaN0 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 1500NaN0 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]

    Notes and References

    1. Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, pages 260-261. Flying Pages Europe SARL, 2015.
    2. Web site: B25 AeroPower Series . 29 March 2018. MWfly. www.mwfly.it.

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