The San Francisco call., 1910-07-17

around the piece OI WOou. iitch 6au6O
another center line crosswise at half
length of working face and right an
giles to working edge all around the
piece of wood Then add two similar
lines, one of them half way forward,
the other one half way aft, as shown
in Fig /.
A good way to help understand fig
ures 3, and 5 and the shaping Of
the boat is to think of looking at the
hull just as IL IT were cut In cross
sections at these points.
BY looking at the crosswise line at
half forward we find that by refer
ence to figure 5 it must extend to a
point 1-16 inches each side Of the
long center line. The line admidship,
by reference to figure 4. must extend
215-16 inches each side OF the same
long center line, and the line at half
way aft must be 2 SIS inches each side
of center.
Having located these points take q
small, flexible stick and bend to form
SO line ruled along its edge will pass
through each of these points. The
points located at extreme aft are con
nected with straight line, as shown
in figure one.
The outside line CA, figure y shows
outline OF bottom and extreme length;
B shows outline at top and length on
deck, and c shows inside form of hull.
We are now ready to take up tool op-
erations and to cut away the wood ac-
cording to the lines of our deck plan
with a Spokeshave and file, making the
cut surface at right angles to the deck
Do not attempt to round the hull yet
according to figures 3, and S.
In the aft part, now cut so the hull
slants from line b, figure /, to A, figure
l. Now three templetS or pasteboard
patterns are cut out of figures 3. and
ofh hnl for ooh ot,x
shaded section of figure S. The shaded
part represents the pasteboard
Beginning at midships, model the
outside of the hull until it conforms to
the templets Slight changes in form
of hull may be made, IL desired, should
the templets be found satisfactory in
outline. They will be found very use
full as a guide. The hull bottom Is
shaped not quite fiat. shown by fig
ure 2. This practically finishes the
work on hull outside.
In preparing for cutting out the
inside of the hull line should be
drawn on deck from ne-quarter to
one-eighth inch from the edge along
each side and three-quarters of an inch
on the deck aft.
In following out for the hold a series
of holes from three-quarters to one
inch in diameter is bored lengthwise on
the center line. These holes should
slightly overlap. series of holes
should be bored in a similar mannar
near the edge and stern lines, being
careful to slant the holes to conform
to the outside lines of the hull and not
10 bore too deep. The depth of tha
holes may be gauged. if a standard
size augur bit is used, by figuring that
one turn OF the bit will cut one-six-
teenth of an inch depth
Other sets of holes each SET aho,+
three inches aDart re now ho,oa
wise so they connect with those hored
through the center and along the side
The small blocks thus formed are now
removed by means OF chiseI ana
mallet. This roughing out process is
coinpieted py means of three quarter
an,no.,s, sron ,souse. IN the finishing and
smoothing of the inside surface
crooked file. round cared cahinat
scraper and coarse sandpaper are used
Inc nun may now receive fnishine
touches with finer grade of sand.
paper 9'no
Then comes the installation of the
motive power. Five dry cell batteries
te) should be sufficient, though man
poats carry more in the hope of in
creasing their racing speed. You can
purchase these batteries for about Ok
cents apiece at any electrical sunnIv
store where you can also get the motor
fro 90 motor costs more, running
from ~ cents UP to 81.
"A Doy who has access TO forge or
manual training school can make the
universal joint that. connects the pro
peiier shaft (h) to the motor (at gl
otherwlse he can buy il for small
sum- This joint is necessary on ac-
count OF the propeller slant, which Is
pest shown In figure Q, where the Ione
tube (D that loosely holds the pro
pelier shaft projects through the bot
tom ". The propeller is made Arm
a.o,i sun Drass or copper. bent to shape
and soldered to shaft end
The batteries are then wired to tha
motor and to the electric switch. as
shown In fgure /. The switch ~ can
be made out OF a piece OF wood and a
couple or pins or can be bought for 10
cents. Then make the rudder In form