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Virus SW 121
Pilot Operating Handbook
POH-121-00-40-001
PAGE REV. 0
SECTION
7
AIRPLANE DESCRIPTION
APPROVED
7.6 POWERPLANT
7.6.1 ENGINE
The engine installed is a Rotax 912 S3 engine providing 73.5 kW takeoff pow-
er. All limits as defined by the engine manufacturer apply. The engine can
be operated with MOGAS or AVGAS 100LL, with max. 10% ethanol and the
following antiknock properties: min. RON 95 (min. AKI 91) as by Rotax speci-
fication. The propeller is driven by a gearbox. The gearbox is equipped with
the Rotax slipper clutch. The engine is provided with a liquid cooling system
for the cylinder heads and a ram-air cooling system for the cylinders. There
is also an oil cooling system for oil common to engine, gearbox and propeller
governor. TBO is 2000 hours.
7.6.2
ENGINE COMPONENTS
Oil System
The dry-sump lubrication system consists of a 3.5 liter-tank, two coolers,
a mechanically-driven pump and a thermostat. Once the oil temperature
reaches 80
o
C the thermostat opens, allowing the oil to flow through the cool-
ers. A dipstick is present on the oil tank to check oil quantity.
CAUTION:
The engine should not be operated with less than minimum in-
dicated quantity of oil (dipstick). For extended flights, oil quantity of at least
half-level between min and max deliminators is recommended.
Engine Cooling
The engine is air and water cooled. Cooling air enters the engine bay through an
inlet on the starboard side of the spinner and is then distributed over the engine’s
cylinders by carbon composite plenum. The water cooling system consists of
a cooler and mechanically-driven pump to provide cooling to cylinder heads.
The heated air exits the engine compartment through a common outlet on
the bottom aft portion of the cowling. No movable cowl flaps are used.
Carburetors
Dual needle-type Bing carburetors are used, each serving one cylinder bank.
Lifetime fliters are installed directly on the carborettors. There is no addition-
al air induction system or carburettor heat, as the engine receives pre-heat-
ed air from the aft side of the upper cooling radiator.
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