d04094
page 10 - 16
Jan. 01/2007
Effectivity: 447 SCDI, 503 DCDI,
582 DCDI
OM Edition 1 / Rev. 0
BRP-Rotax
10.3.7) Operation in flight
It is recommended to use full throttle during take-off and climb, if
not specified otherwise, slight throttle reduction may create a
leaner mixture and should be avoided. Select a cruising speed
where the engine is running smooth.
Do not exceed maximum engine rpm.
During cruise and descending it is very important not to create a
lean condition with high rpm and low throttle opening. The less
fresh charge the engine gets, the more hot residual gas remains
in the cylinder. This raises the temperatures to a critical level. For
this reason, you may also experience higher exhaust gas and
cylinder head temperatures at reduced throttle openings.
Minimum engine idle speed is 2000 engine r.p.m. Higher idle
r.p.m. setting will reduce enrichment action of starting circuit in
carburetor (choke) making cold starting difficult.
Prior to shutdown,engine should be run until latent heat build-up
from previous high power settings has been dissipated (approx.
3000 r.p.m. or at nearest smooth running r.p.m. for a minimum of
two minutes followed by a short period of idle - 2000 r.p.m.).
Do not idle for prolonged periods as normal rich condition present
at this power setting can cause unnecessary carbon deposits and
spark plug fouling. Additional shock loads present at idle cause
gear box, propeller, and/or drive train to operate in conditions
which should be avoided whenever possible.
10.3.8) Special operating conditions:
Water:
There are dangers to your engine that you may not experience on
land. Some of these dangers are water ingestion on take-off or
landing due to spray and splash, corrosion, electrolysis, and,
worst of all, unintentional submersion.
Bearings, crankshaft etc., are highly susceptible to corrosion.
Synthetic oils, although good lubricants, often attract moisture
rather than repel it.
A well designed and well maintained air intake system (e.g.
ROTAX intake silencer with K & N oil impregnated air filter) will
help to prevent water ingestion.
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