Frank eagerly explained the uses and action of all the devices to his father and Jimmie Blakely, the latter of whom had neglected his work shamefully since the Golden Eagle had been roosting under its palm-thatched shed. How the ship got its name was at once apparent as soon as the boys had completed covering its wings. The balloon silk they used was of a rich orange hue and indeed the ship looked like nothing so much as a great golden bird.
The last task the boys had to tackle was the delicate one of placing the engine and its condenser in position and connecting it to the gasolene, water and lubricating tanks. Then there was the job of putting in the ignition apparatus and wiring it up to the spark plugs of the motor. Frank and Harry used the jump-spark system as being both simpler and easier to repair in time of trouble than the make and break method. The spark for starting was obtained from batteries, but when under way the Golden Eagle’s engine was “sparked” by a magneto. Both boys always carried a supply of extra spark plugs in case of the carbonization of the ones already in the cylinders and they had had very little trouble indeed with this important part of their engine, one which gives more bother usually than any other part of the motor. The spark plugs were hooded with waterproof caps as a precaution against short-circuiting by rain or dampness.
The twin propellers of the Chester boys’ craft, four-bladed ones of bronze, framed and covered with specially prepared and varnished fabric. These frames were internally braced by specially tested steel wire and had shown themselves in every way capable of standing the terrific strain that 1200 revolutions a minute put on them. The shafts connecting them with the engine were of the best Tobin bronze, a non-corrosive material and one of the most suitable metals for the construction of propeller shafts.
It took Frank and Harry the best part of another day to adjust the engine to its bed and true up all its connecting parts with spirit-level and plumb-line. This work they had to do alone as it required expert knowledge of the most exhaustive kind.
At last, however, everything was adjusted and screwed in place in a way to satisfy even the critical Frank, who went over every joint and fastening with an eye that spied out immediately the slightest weakness. When everything was announced to be complete at last, a holiday was declared on the estancia and all hands gathered round the palm-thatched shed to watch Frank and Harry tune up the Golden Eagle’s engine.
Frank’s eyes fairly shone as he stepped lightly into the car and opened the valve that sent a flow of life-giving gasolene along a brass tube to the carbureters.
Before he did this, however, the hands had been busy for an hour filling coffee bags with earth and heavy stones and piling them down on all sides of the Golden Eagle. Stout stakes were also driven into the ground and the craft securely roped to them in such a way that she could not free herself when her propellers began to whiz round.
“Now, then, hold tight, everybody!” shouted Frank, as he “tickled” the carbureter, and Harry threw in the switch. The Boy Aviator gave the flywheel a light twist back against the compression—there was a loud “bang,” that made the women shriek and the next minute the engine of the Golden Eagle was purring away as contentedly as if it had never been separated from the craft of which it was the heart and packed up for its long voyage.
But the natives,—where were they? With the exception of one tubby little fellow who was sprawling on the ground and who scrambled to his feet and made off at top speed as soon as possible, there was not one to be seen of all the crowd that had clustered round the Golden Eagle but a few minutes before.
They had not heeded Frank’s warning cry,—somewhat naturally, not understanding it,—and when the huge propellers began to whirl round, creating a regular whirlwind in which hats were snatched from heads, and dresses blown every which way, they had, with one concerted howl of “Witchcraft,” fled to their quarters, where only a great deal of persuasion induced them to leave.