Boys' Book of Model Boats

really designed after the cruising type of motor-boats. This type of boat is particularly adaptable for simple model-making, o

ls are necessary to c

od block

pine for

od and wire for the

paint, scre

aneous

cessary to construct

the hull, and five cross-section lines are drawn at right angles to the center line 5 inches apart. On these lines the builder should mark off the greatest lengths of the boat, taking the dimensions from the half-

nd planed up as true as possible. The builder should then project the section lines with a set square on each side of th

the hull to the correct shape. The cardboard templates must be cut, one for each half-section, as shown in the body plan, Fig. 67. These templates serve to show the proper ou

rm result he should make inside templates. In gouging out the interior of the hull the chisel or

nches wide must be prepared and laid in place on the hull. The shape of the hull is marked off with a pencil and the wood sawed along t

ll and sandpapering it all over. A cross-beam or support, C, Fig. 70, is cut and fitted as illustrated. This particular piece supports the

hull with a few brads. The edge should be cleaned up flush with the hull by the aid of a plane. The opening for the cock-pit, shown in the drawing in Fig. 71, is to be cut in the deck.

hatchways can be cut and the hatch-covers made by cutting another piece of wood 3/16 inch thick to form an edging. A cover piece to go over the small pieces, removed from

lued and pinned in place. The forward deck is completed by the addition of cowl-ventilators, cut from hard wood and screwed in place. The flag-mast is made from a short piece of 1/16-inch wire. The details of the mooring-cleats are shown in Fig. 74. They are fashioned by using a small screw-e

n of the boat. A small wheel about 1 inch in diameter, with an edge filed in it, is soldered to the top of the rudder-post. A fine cord or string, well stretched and oiled, is attached to the wheel and led through two screw-eyes on the deck. From this it is led through an opening in the coaming to a drum on the steering column, which i

pearance of the power plant can be seen by referring to Fig. 77, which is a view of the complete boiler and engine mounted together on the same base. The b

. Three burners are necessary to fire the boiler. These are fitted as shown in F, and they give sufficient heat to produce steam enough to drive the cylinder G. The steam is conducted to the cylinder through the short pipe K. The steam-cylinder has the usual piston and

be a lead casting, and as heavy as possible. A heavy flywheel contributes much to the oper

d all the seams are double-soldered. The lid is also soldered on the can. This little boiler, although not elaborately made,

p at the dotted lines and the seams are soldered. Two angle-plates, B, are then cut and fitted and soldered in place. Next a piece of brass tube with a 1/8-inch bore and 1 inch long is cut and soldered

inder is shown in section in Fig. 80. If the reader will refer back to the construction of the engine de

to the outer edge. This crank-pin should be of such a size that the joint on the end of the piston-rod shown at

ely. They are then soldered in place. Next fit the short steam-pipe K between the boiler and the steam bl

-tube E and air-tube D, as shown in Fig. 77, before soldering the top piece in place. The burners should be made as high as the container, and these should be made from little pieces of tin bent to shape and soldered on to a bottom pipe, as shown in Fig. 77. The builder should also remember to cut the holes through this pipe so that the a

every stroke of the pump, providing it does not come to rest at "dead center." If it does come to rest at "dead center," where no air can enter the piston, the cran

ainer may be filled with denatured alcohol, and the burners lighted and placed under the boiler. In a very few minutes steam will be up. At the first indication of pressure in

rank is similar to the one fitted to the engine, but with a small slot cut out for the crank-pin to fit into. This

mounted at an angle to the tube, so that when it is in place on the stern of

er the tube to the plate, and punch four small holes in the plate, so that it can be screwed firmly to

, as shown in Fig. 83. The shaded portions of the brass disk are cut away. The blades are bent to shape, c

fore-deck should be made removable by fitting it with pins or screws with the heads cut off, so that the deck only needs pushing into place. This little boa