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SECT ION
II
INSTALLATION
1. PREPARING FOR INSTALLATION
Remember
that as much
of the work
of installing an engine takes place
under and around the boat as inside.
Provide
plenty of room.
Remember,
too, that
the boat and
the engine
amount to a considerable weight and
all blocking must be
strong enough
to support this weight plus that of
the people working in the boat.
As the first step, shore up the boat
until
tbe
bull
is
approximately
three feet off tbe floor.
For most
small boats, a three-point
suspen-
sion will
be sufficient.
Blocking
should
be placed
about
six
feet
abaft tbe bow and at each corner of
the transom.
Tbis type of blocking
will give
adequate support
and at
the same time
leave tbe stern sec-
tion free of obstruction. On larger
boats,extra blocking sbould be used
along tbe keel.
Tbe next
step in tbe
procedure is
determining tbe
location and angle
of
the
shaft
hole.
A number
of
things must
be
considered
before
tbis can be establisbed.(See Fig.l)
The
width of
tbe rudder,
size of
the
propeller,
and the
clearance
between the
propeller and tbe bot-
tom of the boat (minimum 2").
Clearance between
tbe
rudder
and
tbe propeller
sbould
not be
less
tban
4",
and room to allow removal
of the propeller
witbout first re-
Fig.l
Location
of Underwater Gear
moving the rudder is more satisfac-
tory. It is, of course, also neces-
sary to know the
exact location of
tbe engine
and tbe
manufacturer's
recommended
maximum
and
mInImum
angles of engine operation.
If full
scale drawings of the boat
are available,
locating tbe
sbaft
bole and
establishing the angle is
simple. It is only necessary to lay
down a
full-sized profile
in some
convenient spot and place over this
drawing
full-size
cutouts of
the
engine,rudder and propeller in their
proper
places. Tbe cutout
for the
propeller need only be an oblong of
cardboard with tbe center carefully
marked. Tbe length sbould equal tbe
diameter, and. tbe
widtb, tbe pitcb
divided by tbe number of blades. For
example, a 12 x 12
propeller would
be represented
by a piece 12" long
and
4"
wide
for a three-blade prop
and
6"
wide
for a
two-blade.
Tbe
engine
cutout
should be a
fairly
accurate reproduction
of the lower
balf of the
engine with the
sbaft
centerline
clearly marked.
This
sbould be drawn witb care on a large
piece of paper using tbe dimensions
given on tbe engine scale . . drawing.
With the
rudder and propeller fac-
similes in place and
proper clear-
ance accounted
for, the
cutout of
tbe engine is
then moved about un-
til tbe
centerline
of
tbe
shaft
lines up with tbe centerline of tbe
propeller, and
tbe spot and
angle
wbere this line
passes througb tbe
keel carefully noted.
The position
of tbe
engine
is
then
carefully
cbecked to be sure
there is suffi-
cient
clearan~e
between it and tbe
bottom of tbe boat and tbat tbe angle
of tbe
engine does not
exceed tbe
recommended
operating angle
(5 to
14 degrees
in most
engines).
The
-4-
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