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Fig.2 :Method of Locating Sbaft Hole
engine
must be lined
up eitber by
raising or lowering
it or changing
the angle.
Do not move
the engine
fore-or-aft
from
its
previously
determined location.
If full scale
drawings of the boat
are not available,
another
simple
method of locating
this spot is to
lay a length of 1 x
4
lumber
from
the center of the transom forward to a
spot well beyond the determined en-
gine 10cation.(See Fig.2). Tempora-
r i ly prop this str ip (A) in place so
it is roughly parallel to the keel.
To this,and at a right angle to it,
nail another strip (B) at the point
where
the flywheel
of the
engine
will be located.
Fasten
a
second
strip (C) so that it passes outside
the stern, follows the angle of the
stern
and projects at
least three
feet below the
bottom of the boat.
Narrow strips
are nou
fastened to
the top strip,
approximately every
foot along its length
and at right
angles to it,
so that the
ends of
the sticks just touch the bottom of
the boat.
This jig, which actually
is a full sized pattern of the in-
s ide of the boat, can now be removed
and laid flat on the floor.
A string is then stretched from the
board which represents
the transom
to the one represent ing the locat ion
of the
fl~1heel.
The string is ad-
-5-
justed to obtain proper propeller
clearances
and crankcase and
fly-
wheel clearance for the engine. When
the position of the string has been
accurately determined, the place it
passes each of the sticks is
care-
fully marked and the jig placed back
in the
boat.
It is
then a simple
matter to lay a
straightedge along
these marks (1,2,3
on Fig.2) to the
bottom of the boat
which will give
the position and angle of the shaft
hole.
2. INSTALLING THE PROPELLER SHAFT
A wedge
is now
constructed which
will fit between
the keel and
the
inboard shaft
log. This
wedge may
be fashioned from any hardwood, but
mabogany is recommended since it is
Fig. 3
Shaft Log
easy to work with and is an excel-
lent marine
material.
This
wedge
should be as wide and as long as the
shaft log to be used and
cut at an
angle corresponding
with the angle
of the
shaft hole minus
the angle
of the shaft log.
(See Fig.3)
The
thickness
of the
wedge will
vary
with
the angle
but the
thin edge
should
be approximately
1/2
inch
thick.
In some cases, the width of
wedge may
exceed the width
of the
keel since it must be as wide as the
shaft log.
In this event, the underside of the
wedge
should be shaped to
fit the
keel
and tbeedges shaped
to fit
alongside the keel and fit the hull
as snugly as possible.
The
wedge
should
also be notched
out to fit
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