When the boat reaches the extremity of the cord the operator at that end of the cord turns it, and starts it on the return journey.
If the cord is strung between two houses you will find the boat will sail back and forth, except when the wind is dead ahead or a few points either way.
A “High-flyer”
To make the “flyer” you will need a piece of thin sheet tin, zinc, or iron, that may be purchased from a tinsmith for a few cents; and for the engine a linen-thread spool, a piece of hard-wood stick, and a few steel wire nails will be required.
To begin with, obtain an empty linen-thread spool having a smooth hole through it, and in one end drive four one-inch steel-wire nails at regular distances apart, so as to form the corners of a perfect square; drive the nails in half-way, then file the heads off, and the spool will appear like Fig. 9. Next get a round hard-wood stick seven inches long, and around it, two inches from one end, make a deep cut with your knife. From this cut to the end of the stick shave the wood away so it will look like Fig. 11.
These two parts will complete the engine, and the next thing to make will be the flyer. Thin sheet-zinc will be found the best to make it of; and having obtained a piece, mark on it with a compass a circle five inches in diameter; mark two lines across this circle from edge to edge, at right angles, as shown by the dotted lines in Fig. 14.
From a piece of stiff paper cut a pattern in the form of one of the ears shown in Fig. 14. Lay this pattern on the zinc so that one of the lines will be in the centre of it, and mark the shape on the zinc; mark the other three ears in a similar manner, and then with a stout pair of shears cut out the flyer.
In the centre of it make a hole large enough for the small end of the stick to pass through it, and around it make four small holes at the centre of each ear, to correspond with the pins on the spool.
The flyer will then fit over the stick and pins and lay flat on top of the spool; bend its ears with your fingers so they appear like the propeller-blades of a steamboat, or like a windmill, and it will then be ready to fly. Fig. 10.
