63B-9-1B-3
2/27/03 3:19 PM Page 21
E
EMU19160
q
Trim angle settings and boat handling
When the boat is on plane, a bow-up atti-
tude results in less drag, greater stability
and efficiency. This is generally when the
keel line of the boat is up about 3 to 5
degrees. With the bow up, the boat may
have a greater tendency to steer to one
side or the other. Compensate for this as
you steer. The trim tab can also be adjust-
ed to help offset this effect.
0
01672
w
1 Optimum angle (level keel line)
2
3
Bow up
Bow down
Bow Up
Too much trim-out puts the bow of the
boat too high in the water. Performance
and economy 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 performance further, and
the boat may “porpoise” (hop in the
water), which could throw the operator
and passengers overboard.
001673
e
Bow Down
When the bow of the boat is down, it is
easier to accelerate from a standing start
onto plane. Too much trim-in causes the
001674
boat
to
“plow”
through
the
water,
decreasing fuel economy and making it
hard to increase speed. Operating with
excessive trim-in at higher speeds also
makes the boat unstable. Resistance at
the bow is greatly increased, heightening
the danger of “bow steering” and making
operation difficult and dangerous.
3-20
| Categories | Yamaha Outboard Manuals |
|---|---|
| Document Type | Boat Motor Manual Free Download. Marine Operator's Boating Guide. |
| Tags | Yamaha 40C, Yamaha 50C |
| Model Year | 2004 |
| 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 |
(0 votes, average: 0 out of 5)