SERVICE MANUAL NUMBER 23
GENERAL INFORMATION
Boat and Engine Performance
Boat Bottom
For maximum speed, a boat bottom should be as flat as possible in a fore-aft direction
(longitudinally) for approximately the last 5 ft (1.5 m).
a
72002
a - Critical Bottom Area
For best speed and minimum spray, the corner between the bottom and the transom should
be sharp.
c
b
72003
a
a - Bottom
b - Sharp Corner
c - Transom (Stern)
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 in-
creases wetted surface and reduces boat speed. A hook, however, aids in planing and re-
duces 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 sup-
port directly under the transom.
b
72004
a
a - Hook
b - Transom (Stern)
Index
90-861326--1
MARCH 1999
Page 1A-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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