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A roll of the wheel, and the launch darted toward him. When within a hundred yards the whir of the big engine and the chugging of the two-cycle motor of the yawl stopped, and as the boats were passing each other, Mr. Barstow hailed the skipper of the yawl. "Oh, Captain Hull! All's well. The boys have been found. Spread the news. Hunt up the other boats and all hands report to me at Myers."
When Joe became insufferably informative Perry blandly asked him questions about the engine, such as, "What's the difference, Joe, between a two-cycle and a four-cycle motor?" or "What happens when the water-jacket becomes unbuttoned?" and was delighted to find that Joe lapsed into silence until he had had time to surreptitiously consult his book.
I understand. Thank you, Commander." Mike the Angel nodded curtly and went back to work. Things weren't bad enough as they were. They had to get worse. The Brainchild had been built too fast, and in too unorthodox a manner. The steady two-cycle throb did more damage than it would normally have done aboard a non-experimental ship.
The bugs weren't all out of the Brainchild, by any means, and the men knew it. She had taken a devil of a strain on the take-off, and something was about due to weaken. It was the external field around the hull that had decided to goof off this time. It developed a nice, unpleasant two-cycle throb that threatened to shake the ship apart.
With a canopy fitted to it a person could cruise all about the lake and stay out over night, for you could sleep on the seat cushions. It is twenty-one feet in length and has a five-and-a-half-foot beam, the design being what is known as a compromise stern. The motor is a double-cylinder two-cycle one, of ten horsepower.
The American artist heard with a vague smile the difference between the ordinary four-cycle engine of an automobile, and the two-cycle engine of this marine motor, with its piston receiving an impulse at each down stroke; tried to understand how the charge of vaporized petrol was drawn into the crank-chamber, and there slightly compressed; how the gas afterwards traveled along a by-pass into the firing chamber at the upper part of the cylinder, to be further compressed by the up-stroke of the piston and fired by the sparking plug, while the burnt gases escaped through a port uncovered by the piston in its downward strokes, admission and exhaust being thus controlled by the piston movement alone.
The piston is connected with the engine-crank and revolves the shaft, which is in turn connected with the driving-wheels. This is called a two-cycle motor, because two complete revolutions are necessary to accomplish all the operations. Many machines are fitted with heavy fly-wheels, the swift revolution of which carries the impetus of the power stroke through the other three operations.
Before Leda could say anything, Snookums rolled over to Mike the Angel and said: "Check the lead between the 391-JF and the big DK-37. I think you'll find that the piping is in phase with the two-cycle note, and it's become warped and stretched. It's about half a millimeter off plus or minus a tenth.
No one would use a cement bag for supplies, now that he thought about it. He looked up suddenly as a sound came through the trees. It was a motor, but a small two-cycle kind, like a scooter or a small motorcycle. "Someone coming," he said. "Let's go see who it is." Scotty held onto the bag.
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