GENERAL INFORMATION
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 1A-7
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).
72002
a
a-Critical Bottom Area
For best speed and minimum spray, the corner between the bottom and the transom should
be sharp.
72003
a
b
c
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.
72004
a
b
a-Hook
b-Transom (Stern)
Downloaded from https://needmanual.com/!
To Next Page
Loading...
Need help?
General