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Italy's MW Fly Develops Experimental B25R 150-hp Engine


MW Fly's new B25R engine puts out 150 hp - which will be boosted to 225 hp by the end of 2013 with the addition of a turbocharger. Externally the 150-hp, 2.5-liter version of the B25R is identical to the previous 2.2-liter B22, but both engine families will soon look slightly different with redesigned cylinder head covers that will shave almost an inch off total engine width.

By Marino Boric, EAA European Correspondent

January 31, 2013 - In 2012, Italian engine manufacturer MW Fly (formerly called Metalwork) introduced to the European market its B22 four-stroke, 2.2-liter, horizontally opposed, liquid-cooled aviation engine family. This year promises to be an important milestone for the young company with the immediate introduction of the B25R, rated 150 hp at 4550 rpm from a 2.5-liter displacement.

Total weight is 174 pounds with all necessary components for proper engine operation such as the oil and water tank, electronic control unit (ECU), generator, and starter. Not included are the coolant radiator and the exhaust system.

The new B25R is based on the B22, which, along with the direct-drive, 95-hp D version, also comes in B22L (115 hp) and R (130 hp) geared configurations.

Following introduction of the normally aspirated B25R, the company plans to launch the turbocharged version in the second half of 2013, according to engine designer Stefano Marella. By the end of 2013 MW Fly intends to present the clockwise-turning variant of its engines (the engines now turn counter-clockwise). This year MW Fly will start delivery of new redesigned cylinder heads with twin fuel injectors and modified valve covers that make the engine almost an inch narrower.

Another important point for rotorcraft builders: MW Fly has developed and tested a helicopter version with a clutch.

Almost 10 years ago, two Italian engineers, Guido Fantini and Stefano Marella, started with the design of the B22 engine. In 2004 the first two prototypes were running on a dyno. The engine was first flown in 2006 aboard a trike. A proprietary digital engine monitoring system (EMS) was also introduced that year.

Two years later the B22 was installed and flown in an Italian ultralight, and by mid-2010, the company presented the Metalwork engine to the Italian public. MW Fly tested the engine in January 2011 in a Magni Orion autogyro. Since mid-April last year, the 130-hp B22R engine has been flying in a Dova Skylark ultralight. This engine/aircraft combination was officially presented in mid-2012 in Italy and Germany.

MW Fly has indicated it will show its entire engine line at EAA AirVenture Oshkosh 2013.


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