SERVICE MANUAL NUMBER 26
GENERAL INFORMATION
For best speed and minimum spray, the corner between the bottom and the transom should
be sharp.
b
c
72003
a
a - Bottom
b - Corner
c - Transom
The bottom is referred to as having a “hook” if it is concave in the fore-and-aft direction. A
hook causes more lift on the bottom near the transom and forces the bow to drop. This
increases wetted surface and reduces boat speed. A hook, however, aids in planing and
reduces any porpoising (rhythmical bouncing) tendency. A slight hook is often built in by the
manufacturer. A hook also can be caused by incorrect trailering or storing the boat with
support directly under the transom.
72004
a
a - Hook
A “rocker” is the reverse of a hook. The bottom is convex or bulged in the fore-and-aft direc-
tion. It can cause the boat to porpoise.
a
72005
a - Rocker
Any hook, rocker or surface roughness on the bottom, particularly in the all-important
center-aft portion will have a negative effect on speed, often several miles per hour on a fast
boat.
Index
90-861329--1
MARCH 1999
Page 1A-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(6 votes, average: 5 out of 5)
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Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke