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Jabiru Aircraft
Pty Ltd
Installation Manual
Jabiru 3300 Aircraft Engine
REVISION
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Dated : 1
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Dec 2016
Page: 10 of 56
1
Engine Mount
The design of the engine mount must balance many requirements:
The mount must be strong enough to carry the loads applied by the weight and power of the engine.
The mount must be stiff enough that the engine does not sag or move too much when power is applied.
The mount must position the engine at the correct height and angle so that the engine’s thrust line suits the
aircraft. In most installations, Jabiru Engines need to have their thrust axis offset to the right (tractor
installations) by between 1° and 2°.
The mount must position the engine at the right place. The weight of the engine is a very significant part of
the overall aircraft
weight, and it’s position must be calculated to place the centre of gravity of the aircraft
(CG) in the right spot.
The mount must be designed to allow enough room for the air intake to the Carburettor as well as
accessories like vacuum pumps. Access for maintenance must also be considered.
The final design of the engine mount is a compromise, and sometimes special parts will be required to make
it work. For example to give a good CG location the engine may have to be mounted as close to the firewall
as possible. This meant that custom air intake tubes will be required to get the intake air to the carburettor
with a minimum disturbance and turbulence.
The engine has four engine mounting points located at the rear of the engine (shown in Figure 1 or Figure 4)
from which the engine is to be mounted. An optional bed mount may be fitted.
Figure 4. Engine Mount Point Locations
Each engine mounting point is rubber mounted to damp the engine vibrations. The correct installation of
these rubbers is shown below Figure 42.
If required, corrections of the engine angle or propeller position can be made by fitting spacers under the
rubber cushions. The maximum spacer thickness on any one mount is 3mm.