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11. V-DRIVE INSTALLATION
In recent
years
two factors
have
had a great
influence on power for
outboard
type hulls.
One of these
is the demand for greater speed and
the other a requirement for engines
with
sufficient power
for
towing
water skiers. In many cases the de-
mand for additional power and speed
has been met by the use of a higher
horsepower
outboard or by
instal-
ling twin motors. A second solution
has been the installation of an in-
board engine
~ith
V-drive.
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AFT
LINE 7"
\ \
FROM
HORIZ,
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In this case,
the
keel
should be
leveled from
the transom
to about
six feet
forward to
aid in deter-
mining the
shaft bole location
and
angle.
Location of tbe
sbaft hole and de-
termining
its angle
are tbe
next
steps. Any of tbe methods described
before
will
work.
However, since
the keel
bas been
leveled and the
distances
involved are short,
de-
termination
of the shaft
angle by
means of a simple, full-size sketch
is the easiest
(See Fig. 12).
In
I
I
.+
\ \
ENGINE SHAFT ANGLE 24"
\\'\~I--------~~----~--~~~~~~~~--~
'II,
KEEL
KEEL
r--=13f~
3°
- L c
J~
INSIDE EDGE
Dr TRANSOM
Fig. 12
Typical Sbaft Location
These V-drive engines are
designed
to be mounted in tbe
extreme stern
of tbe boat.
Tbey are suitable for
most
outboard
bulls 17' and
over
and are being used successfully
in
houseboat hulls up to 32' in lengtb.
Tbe installation of a V-drive engine
differs from the
installation of a
conventional drive engine
in
that
the
engine is
mounted aft
and in
the reverse position, witb tbe fly-
wheel toward the stern of tbe boat.
Tbe
installation
of a
typical V-
drive engine will be described berea
The
general
principles and
prac-
tices will
serve for most
V-drive
engines
altbougb
tbe
angles
and
dimensions may vary.
Preparation
for
mounting
the
V-
drive
engine
is
like
that
for
mounting
conventional
engines and
tbe
same
steps
are
followed
in
each
case.
As before,
the
first
step is the blocking up of the boat.
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®
f
WEDGE DIMENSIONS
MATERIAL - MAHOGANY
KEEL THICKNESS
F
H
1'/2"
''Ia''
"//6
"
-
15/
s "
1'/."
91,&
"
,'/
.....
1'/8"
7/" "
, 7/8"
,
"
5/ ....
2"
'le"
'11,"
Fig.
13
Wedge Sizes
making
this sketch,
two
parallel
lines are
dralm
approximately six
feet long, with the distance
be-
tween tbem
equalling the thickness
of the keel.
A line is
then drawn
on tbe sketch, indicat ing the crank-
sbaft
center,
at an angle
to the
keel equal to the recommended engine
mounting angle (7
0
in Fig. 12). The
prop sbaft line is now drawn slant-
ing down and through the keel at an
angle to the crankshaft
line equal
to the
engine sbaft
angle.
This
angle is obtained from the manufac-
turer's scale d.rawings
or from ac-
tual measurement of·the engine (24
0
in Fig. 12).
A third line is
tben
drawn from the point tbe shaft line
intersects the top
of the keel, at
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