in Fig. 85, which will also give the reader an idea of the appearance of
the finished model. As the drawing indicates, it will not be necessary
to tilt the motor to any great degree in order to bring the propeller to
the proper depth. This is because of the depth of the boat. Instead of a
string or belt to connect the motor with the propeller, the shaft of the
motor is taken out and replaced by a longer steel rod that will serve
both as a motor-shaft and a propeller-shaft. The propeller-shaft extends
from the motor through the stern-tube. The propeller used for this model
is a three-blade affair, 3 inches in diameter. It must be of this size
in order to propel a boat of these dimensions at a consistent speed.

Care must be taken in mounting the motor in this way. If it is not
mounted directly in line with the stern-tube the propeller-shaft will
have a tendency to bind. However, with a little care no trouble should
be experienced from this source. The storage battery used should be of
the four-volt forty-ampere hour variety. This boat will be capable of
carrying such a battery and this weight should just bring the craft down
to her load water-line. The whole deck is made removable, so that the
storage battery can be taken in and out at times when it is necessary to
recharge it. A battery of this capacity, however, will drive a small
motor similar to the type used on the boat for some time.

CHAPTER VIII

AN ELECTRIC SUBMARINE-CHASER

THE submarine chaser design given in the drawings and described in the
text of this Chapter is a presentable little boat with pleasing lines
and deck fittings. There is nothing difficult about its construction,
and, considering the amount of work necessary to produce it, it is
probably one of the most pleasing boats described in the book. If made
correctly it will look "speedy" and shipshape.

The general outline of the boat can be gathered from Figs. 86, 87, and
88. Fig. 86 gives a side view of the craft; Fig. 87 shows the bow, while
Fig. 88 gives the deck-plan.

[Illustration: FIG. 86]

[Illustration: FIG. 87]

[Illustration: FIG. 88]

Notice first the construction of the hull. This is made according to the
Sharpie type, but the lines are changed to give the boat a more graceful
appearance. This is done by changing the shape of the deck and the
bottom pieces. Fig. 89 shows the various pieces necessary to construct
the hull. It will be seen that the forward portion of th