Propellers - BRP Evinrude Installation Manual

PREDELIVERY

PROPELLERS

PROPELLERS
Propeller Selection
A
CAUTION
Selection of the wrong propeller could
reduce engine service life, affect boat per-
formance, or cause serious damage to the
powerhead.
Water testing with various propeller designs and
sizes is the best method of propeller selection.
The correct propeller, under normal load condi-
tions, will allow the engine to run near the mid-
point of the RPM operating range at full throttle.
Refer to SERVICE SPECIFICATIONS in the Ser-
vice Manual for RPM range.
H
100%
o
90%
r
80%
s
70%
e
p
60%
o
50%
w
40%
e
30%
r
2000 3000
RPM
NOTICE
If the propeller blades have too
much pitch, the engine will operate below its
normal range at full throttle. Power will be lost,
and powerhead damage could occur. If the
propeller blades have too little pitch, the
engine will operate above its normal range and
damage from overspeeding could occur.
86
Operating Range
Peak HP
4000 5000 6000
When selecting a propeller, consider the following:
•
Use an accurate tachometer to determine the
engine's full-throttle RPM.
•
The outboard should be trimmed for top speed.
•
Select a propeller that suits the customer's
application and allows the engine to run near
the midpoint of the full-throttle operating range
when the boat has a normal load.
•
Occasionally, one propeller will not cover a wide
range of boat applications — water skiing to
high speed performance boating. In such cases,
it might be necessary to have a propeller for
each situation.
•
Refer to the Evinrude/Johnson Genuine Parts
and Accessories Catalog for propeller styles
and sizes.
•
Right-hand propellers are considered standard
rotation propellers. When propelling a boat for-
ward, the propeller rotates in a right-hand
(clockwise) direction as viewed from the rear.
•
Left-hand propellers are considered counter-
rotation propellers. When propelling a boat for-
ward, the propeller rotates in a left-hand (coun-
terclockwise) direction as viewed from the rear.
008329
1. Right-hand rotation (clockwise)
2. Left-hand rotation (counterclockwise)
For dual-outboard installations, always
check to be sure propellers are installed
on the correct engines before aggres-
sively operating the boat.
2
A
WARNING
1
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