2. Use extreme caution while operating the engine in B. Pitch
confined areas such as enclosed slips or congested
piers. Operation under such conditions could easily Pitch is a measure of helix angle, or angle of attack, of
lead to exhaust gasses (carbon monoxide) entering the rotating blade. Pitch is easily understood if one imag-
eventhoughyoumayhaveallthehatches,windows, ines the propeller rotating through a semisolid such as
doors and portholes closed.
butter or jello. The distance the propeller will travel in one
Persons sleeping can be easily overcome by carbon will also have a direct bearing on engine rpm’s because
monoxidebecausetheyareunawareofitspresence. of the greater bite taken by the blade with each rotation.
Sleeping while the engine is running is not recom- See Figure E1.
way, those awake should monitor for carbon mon-
NEVER operate the propulsion engine while ev-
eryone on-board is sleeping. Fatal carbon mon-
oxide poisoning can occur.
For additional information, refer to Section B-2 Carbon
E - 3
Consult the Engine Owners Manual included in the
E - 4
Knowledge of the propeller is most easily gained through
better understanding of the terminology used to refer to
the aspects of propeller size and performance.
Never run with a damaged propeller. You can
damage the engine or drive unit. Keep a spare
propeller on board.
Figure E1: Propeller Pitch & Diameter
C. Prop Slip
When traveling through water a propeller is unable to get
a complete bite because of the fluidity of water. “Prop
Slip” is usually expressed as a percent of the computed
theoretical speed. Fifteen to twenty-five percent prop slip
is common for a sport-type boat operating at cruising
Diameter is twice the distance from the center of the prop
is due to the greater amount of propeller blade surface in
contact with the water. See Figure E1.
Changing either diameter or pitch will have an effect on
engine speed and prop slip, and in turn, directly affect the
Sundowner™ Owner’s Manual
|Categories||Four Winns Manuals, Four Winns Sundowner Manuals, Outboard Marine Corporation Manuals|
|Tags||Four Winns Sundowner 205, Four Winns Sundowner 225, Four Winns Sundowner 245, Four Winns Sundowner 285|
|Model Year||2003, 2004, 2005, 2006, 2007, 2008|
|Document Type||Owner's Manual|
|Product Brand||Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx|
|Document File Type|
|Wikipedia's Page||Outboard Marine Corporation|
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