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VIRUS
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Aircraft and systems on board
Propeller types:
propeller Pipistrel BAM2: twin blade, xed pitch composite propeller - diameter 1660 mm
propeller Pipistrel VARIO : twin blade, variable pitch composite propeller - diameter 1620 mm
VARIO propeller
A variable pitch propeller signicantly increases aircraft’s takeo, cruise and glider performance.
CAUTION! Always y in such a manner that you are able to reach at least one landing-out site
every moment of the ight. This especially applies to unpowered ight as ignition, engine and/or
propeller malfunction may prevent you from restarting the engine and by that resuming normal
ight.
Use of Vario propeller
decreasing propeller pitch increasing propeller pitch
The screw in the middle of the knob indicates propeller pitch status. The screw is deep inside the
knob when at minimum pitch and slides out as propeller pitch is increased.
When taking-o, always make sure propeller is set to minimum pitch to ensure maximum engine
eciency. To set the propeller to minimum pitch, screw the propeller pitch knob located on the in-
strument panel counter clockwise completely. Prior to taking-o, engine and propeller ground check
must be performed. At full power and propeller pitch at minimum, RPM must not exceed designated
limits. Verify also, that the RPM drop signicantly when setting propeller pitch to maximum setting
(knob screwed to the right fully, but not feathered!). When returning propeller pitch back to mini-
mum setting, the RPM must reach same initial value as before engine and propeller ground check!
CAUTION! Verify RPM and engine parameters multiple times.
If propeller pitch is increased (rotate knob clockwise), engine’s RPM will drop. Do not, under any
circumstances, allow engine underrotation. Should this occur, immediately decrease prop. pitch to
regain proper engine cruise parameters.
WARNING! Both engine under- and overrotation may cause signicant damage to the en-
gine and propeller.
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