2004 Yamaha Outboard F75C F90C Boat Motor Owners Manual

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3/20/03 9:19  Page 17
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EMU19160
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.
q
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 steeringand making
operation difficult and dangerous.
3-16
Product Specification
CategoriesYamaha Outboard Manuals
Document TypeBoat Motor Manual Free Download. Marine Operator's Boating Guide.
Tags,
Model Year2004
Download File
Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step.
- 112 pages
LanguageEnglish
Product BrandYamaha 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 TypePDF
Publisheryamaha-motor.com
Wikipedia's PageYamaha Motor Company
CopyrightAttribution Non-commercial
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