Mercury 75 Service Manual page 26

Determining Recommended
Outboard Mounting Height
e
NOTE: Add 5 in. (127mm) for XL models and 10 in.
(254mm) for XXL models to listed outboard mounting
height.
a. This solid line is recommended to determine
the outboard mounting height.
IMPORTANT: Increasing the height of outboard
generally will provide the following: 1) Less
steering torque, 2) more top speed, 3) greater
boat stability, but, 4) will cause more prop "break
loose" which may be particularly noticeable
when planing off or with heavy load.
b. These broken lines represent the extremes of
known successful outboard mounting height
dimensions.
c. This line may be preferred to determine out-
board mounting height dimension, if maxi-
mum speed is the only objective.
1D-2 - IMPORTANT INFORMATION
26 in.
(660m
m)
25 in.
(635m
m)
24 in.
(609m
m)
23 in.
(584m
m)
e
22 in.
(560m
m)
21 in.
(533m
m)
20 in.
(508m
m)
19 in.
(482m
m)
10
WARNING
Boat instability can occur at high speeds by
installing engine at the wrong transom height.
Contact the boat manufacturer for their recom-
mendations for a specific engine installation.
a
20 30 40 50
f
d. This line may be preferred to determine out-
board mounting height dimension for dual
outboard installation.
e. Outboard mounting height (height of out-
board transom brackets from bottom of boat
transom). For heights over 22 in. (560mm), a
propeller, that is specifically designed for sur-
facing operation, such as the "Laser" and "Mi-
rage" series, usually are preferred.
f. Maximum boat speed anticipated.
90-830234R3 DECEMBER 1997
c
d
60 70 80
b