slip is common for a cruiser-type boat operating at cruis- The running angle can be controlled through the use of
ing speed.
power trim and trim tabs. See Section B-6 Trim Tabs,
for information on the use of trim tabs.
Thereforethedeductioncanbemadethatapropeller,ofa
certain diameter, with a 10 inch pitch, rotating at 3600
revolutionsperminute,withapropslipof30%,wouldmove
the boat at a rate of 24 miles per hour.
Changing either diameter or pitch will have an effect on
engine speed and prop slip, and in turn, directly effect the
performanceofaboat. Thepropeller(s)includedwitheach
Four Winns boat provide the best general performance
based on data obtained from on-the-water testing of that
model. Variations in load, operating conditions,
environment, the individual engine and hull performance
may necessitate the purchase and use of another
propeller(s).
Under your normal load conditions, the engine(s) should
turn within the maximum RPM range when at full throttle.
If the engine(s) exceeds the recommended RPM, an in-
crease in pitch or diameter is required. If the engine RPM
is too low, a decrease in pitch or diameter is required.
An engine that is not developing full power and the load
carried in a boat will directly affect performance of the
engine. Always be sure the engine is properly tuned and
load conditions are those normally experienced, before
changing propellers.
NOTICE
For twin engine installations, always check drive
shaft rotation before propeller installation. Aright
hand rotation propeller must be installed on the
stern drive to the starboard engine. Similarly, a
left hand prop must be installed on the port stern
drive.
Figure B3: Running Angle
A. Power Trim
Foradditionalinformationonfactorsaffectingperformance,
please consult your Four Winns dealer.
Trim angle is how far in or out, the lower unit is posi-
tioned in relation to the bottom of the boat. The trim
angleof thelower unit has adistinct affect ontherunning
angle of the boat.
B - 6
RUNNINGANGLE & POWER TRIM/TILT
The power trim system permits control of the trim angle
of the drive unit relative to the boat, at the touch of a
button.
Hull planing surfaces have the least amount of drag at a
three to five degree angle with the water. This is the pre-
ferredrunninganglewhenboating. Therunninganglehas
a significant impact on top speed and handling. Heavy
load or certain water conditions may make it difficult to
achieve the optimum running angle. See Figure B3.
It allows the drive unit to be raised (trimmed out) for shal-
lowwateroperation. Powertrimalsoallowstheoperator
to adjust the drive unit while underway to provide the
ideal running angle for a given load and water condition.
Additional information can be found in the Engine Own-
ers manual.
Vista Owners Manual
10/93
Section B
Page5
| Categories | Four Winns Manuals, Outboard Marine Corporation Manuals |
|---|---|
| Model Year | 1998, 1999 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx |
| Document File Type | |
| Publisher | fourwinns.com |
| Wikipedia's Page | Outboard Marine Corporation |
| Copyright | Attribution Non-commercial |
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