34 Vol.3 No.3 / March 2014
UNDER THE COWL
AEROPOWER ENGINES: ONE BASE, FIVE VERSIONS
The MW Fly B22/25 engines are designed in a classic aero-
nautic spirit but using modern technologies. All Aeropower
engines are aluminum made, have four cylinders, and are
four-stroke with horizontally opposed cylinders. All engine
versions/variants are liquid cooled, with two overhead
camshafts (chains driven) and two valves per cylinder. The
B22 engines' displacement is 2200 cc ("22" stands for 2200
cc), and the last developed engine, the B25, has a 2500-cc
displacement (achieved by a bigger cylinder bore). The
naturally aspirated B22 and B25 engines deliver from 95
to 150 hp.
The Aeropower engine variants are:
1. B22D, 95 hp at 3300 rpm, direct drive, 80 kilograms
(176 pounds)
2. B22L, 115 hp at 3950 rpm, propeller speed reduction
unit (PSRU), 84 kilograms (185 pounds), $16,900, TBO
2,200 hours
3. B22R, 130 hp at 4550 rpm, PSRU reduction gear, 84 kilo-
grams (185 pounds), $18,900, TBO 1,800 hours
4. B22H, 130 hp at 4550 rpm, direct drive for helicopters, no
reduction gear, 79 kilograms (174 pounds)
5. B25R, 150 hp at 4550 rpm, PSRU reduction gear, 84 kilo-
grams (185 pounds), $21,900, TBO 1,500 hours.
Weight specs are for bolt-on engines less liquids, water
In 2013, MW Fly introduced four
Aeropower engines to the U.S. market
in power ranges from 95 to 150 hp,
and it is promising more engines soon.
Because of the length of the air intake manifolds, in fl ight the MAP is higher than the outside air pressure.
This "electric block" makes the engine installation easy.
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