Operation
ciency. This is generally when the keel line of through the water, decreasing fuel economy
the boat is up about 3 to 5 degrees. With the and making it hard to increase speed. Oper-
bow up, the boat may have a greater tenden- ating with excessive trim-in at higher speeds
cy to steer to one side or the other. Compen- also makes the boat unstable. Resistance at
sate for this as you steer. The trim tab can the bow is greatly increased, heightening the
also be adjusted to help offset this effect. danger of “bow steering” and making opera-
When the bow of the boat is down, it is easier tion difficult and dangerous.
to accelerate from a standing start onto
plane.
NOTE:
Depending on the type of boat, the outboard
Bow Up
motor trim angle may have little effect on the
trim of the boat when operating.
Too much trim-out puts the bow of the boat
too high in the water. Performance and econ-
omy are decreased because the hull of the
boat is pushing the water and there is more
air drag. Excessive trim-out can also cause
the propeller to ventilate, which reduces per-
formance further, and the boat may “por-
poise” (hop in the water), which could throw
the operator and passengers overboard.
EMU27931
Tilting up and down
If the engine will be stopped for some time or
if the boat is moored in shallows, the out-
board motor should be tilted up to protect the
propeller and casing from damage by colli-
sion with obstructions, and also to reduce
salt corrosion.
EWM00220
WARNING
Be sure all people are clear of the out-
board motor when tilting up and down,
also be careful not to pinch any body
parts between the drive unit and engine
bracket.
EWM00250
WARNING
Leaking fuel is a fire hazard. If there is a
Too much trim-in causes the boat to “plow” fuel joint on the outboard motor, discon-
Bow Down
32
| Categories | Yamaha Outboard Manuals |
|---|---|
| Document Type | Boat Motor Manual Free Download. Marine Operator's Boating Guide. |
| Tags | Yamaha 90D |
| Model Year | 2005 |
| Download File |
|
| Language | English |
| Product Brand | Yamaha Motor. Yamaha Motor Corporation, USA - Support Customer Relations for US: 1-800-962-7926
Yamaha Boats: 1-800-962-7926 Yamaha Outboard Customer Relations: 1-866-894-1626 , Yamaha Outboard |
| Document File Type | |
| Publisher | yamaha-motor.com |
| Wikipedia's Page | Yamaha Motor Company |
| Copyright | Attribution Non-commercial |
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