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any ribs which might interfere. The
wedge is then screwed into position
over the locat ion of the shaft hole.
Use a
good grade bedding
compound
between the wedge
and the keel and
fasten
securely
to the
keel with
scre'ws, being careful to place these
scre'~Ts
'where they will not interfere
with the shaft log mounting screws.
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I<£EL
Fig.4 Method of Drilling Shaft Hole
After the wedge is in place,
pre-
pare for the
drilling of the shaft
hole.
Preparation
for
this
step
consists of the construction of two
hardwood blocks
which will
act as
guides
in getting
the shaft
hole
started
properly and
keeping
the
angle of
drilling fairly accurate.
These blocks should be of straight-
grained
hardwood
maple or
oak
wi
11
do. They should be approximately
2" thick,
5"
wide and 10" long.
One
of these
blocks
(See
Fig. 4
and
5)
is fastened
to the
inside
of the boat
so that the
center of
the block
lines
up
approximately
with
the
position
of
the
shaft
hole and
th9 other is
fastened to
the bottom
of the
boat at the ap-
proximate
position
the hole
will
emerge.
The face of the block fas-
tened to the
inside of the boat is
cut so as to be at
right angles to
the
drilling
angle.
In
order to
keep the
drilling angle
accurate,
a guide block
can be
fastened
3"
to
6"
from this starting
block. A
notch cut in this block to
fit the
shank of the drill will support the
drill
at
the
proper angle.
(See
Fig
~
5)
-6-
A drill
1/8 inch
larger
than the
shaft
diameter should
be used
to
provide
PI'
opel' c-learance.
Any type
of drill
may be
used
which
will
drill a clean hole
and has a shank
long enough to pass through the two
blocks and the keel.
A
standard car-
penter's auger is
not
recommended
since
the "wore"
tends to
follow
the grain end using it may result in
a wandering hole. If a drill cannot
be found
with a
sufficiently long
shank,it can be extended by welding
on a stee
1
I'
ad.
~;ll.en
the dr i 11 has
passed completely
through the keel
and the bottom block, it can be re-
moved and the two temporary drilling
blocks unscrewed from the boat.
Now lay the shaft log
on the wedge
and over
the shaft
hole.
In some
cases, it will be necessary to chisel
out the wedge to conform to the bot-
tom of
the shaft
log.
Make
this
notch slight ly larger than necessary
to allow for later alignment.Fashion
a gasket from
1/16"
rubber or
1/32"
gasket mat er ial and place it between
the shaft log and wedge.
Fig.5 Photo of Drilling Operation
Insert the
propeller shaft
in the
shaft hole
and uith the
shaft log
over the hole,
position the
shaft
log so that the
propeller shaft is
approximately in the
center of the
halo in
the shaft
log.
Coat both
sides of the shaft log
gasket with
a good marine sealer and fasten the
shaft log in place with screws long
enough to
pass
through
the 'wedge
and well into the keel.
Next slip the shaft
strut over the
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