Jabiru Aircraft
Pilot Operating Handbook
Model J230-D
Revision:
6
28/2/2020
Page 46
Most of the warm up will have occurred during taxiing and whilst conducting the Before Take-Off
checks. The engine is warm enough for take-off when the cylinder head and oil temperatures are
in the green arcs.
Ignition System Check
The magneto check should be made at 2000 RPM as indicated by the tachometer with the
carburettor heat set to COLD. Select the LEFT ignition OFF and note the RPM drop, return to
BOTH until the engine regains speed. Select RIGHT ignition OFF and note the RPM drop, return
to BOTH. Drop in RPM should not exceed 100 RPM. Do not operate on a single ignition source
for an extended period; a few seconds is usually sufficient to check RPM drop and will minimise
spark plug fouling.
4.9.7
Take-Off
Power Check
Full throttle runups over loose gravel are especially harmful to the propeller and should be avoided.
When take-offs must be made from a gravel surface, it is very important that the throttle be
advanced slowly and a rolling start take-off technique be used to minimise propeller damage.
It is important to check full throttle engine performance early in the take-off run. Any sign of rough
engine operation or sluggish acceleration is good cause for discontinuing the take-off and
conducting a full power runup to confirm normal engine operation prior to the next take-off attempt.
Wing Flap and Power Settings
Normal take-offs are accomplished at full throttle, and TAKE-OFF flap selected. The flaps should
not be retracted until a safe height is achieved and all obstacles have been cleared. Take-offs
may be made with flaps up but this will increase the take-off distance and will result in a more
pronounced nose up attitude at lift off.
4.9.8
Climb
Enroute climb
Enroute climbs are performed with flaps up, full throttle, and at speeds 5 to 10 knots higher than
the best rate of climb speed. This provides better engine cooling with little loss of climb
performance.
4.9.9
Cruise
The power setting and cruising altitude are the two major factors that will affect the cruising speed
and range of the J230. Other influencing factors include the weight and loading, temperature and
equipment installed in a given aircraft. The maximum power setting normally used for cruise is
75% of the engine’s rated power. Power settings below this will result in increased range and
endurance corresponding with the reduced fuel consumption. At a power setting of 45% the J1230
is capable of attaining an endurance of close to 10 hours, for a range of over 900 nautical miles.
For efficient and economical operation as well as to achieve maximum engine service life the
engine must always be operated in accordance with the procedures and specifications set out in
the
engine manuals.
