C42E 540kg LSA POH Issue 3 China
15.03.2016
Page 27 of 36
7.4
Engine
The 100 hp Rotax 912ULS is installed and drives the propeller via a gearbox with a reduction ratio of
2.43:1 respectively. The power plants is flat 4 cylinder, 4 stroke engines with air and oil cooled cylinders
and water-cooled heads. Full descriptions of the engine, its performance and maintenance requirements
are to be found in the Rotax manual.
According to ROTAX Manual:
Oil Pressure:
2 - 5 bar
Oil Temperature:
min.
50° C
max.
130
°
C
preferred range
90 - 110° C
Maximum coolant temperature
115
°
C
Maximum Cylinder Head Temp. (CHT)
912ULS (100hp)
135
°
C
Above CHT and coolant temperatures assume 50% glycol/water coolant mixture.
Exhaust system
The engine is fitted with a Hagerman Exhaust and Silencer System. This system is built largely from
stainless steel components.
7.5
Propellers
The following propeller types and settings are approved for use:
100hp
:
Neuform CR3 3 blade (1,75 m Ø)
Pitch 27º @ 310mm from hub edge
Full throttle ground static RPM
4700rmp - 4800rpm (prop
≈
1950 rpm)
Slight adjustment to the pitch of each of the above propellers may be necessary to obtain the correct
ground static rpm. An optical tacho on the propeller is the preferred method of measuring the engine
speed.
All approved types have blades with ground-adjustable pitch and should be set to the pitch angles given.
This pitch angle is prescribed at a specific radius from the point at which the blade exits from the hub.
The propeller had aluminium alloy hubs machined to close tolerances. This permits secure clamping of
the blade roots under the high centrifugal forces experienced by the blades in service. Proper blade root
securing bolt tension is essential to maintain this security.
The Neuform propeller blades are moulded in composite material, either carbon fibre in epoxy resin.
Blades of this type carry all of their strength and rigidity in the external skin.
