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Coming to the Lebaudy brothers and their work, their engine of 1902 was a 40 horse-power Daimler, four-cylindered; it was virtually a large edition of the Daimler car engine, the arrangement of the various details being on the lines usually adopted for the standard Daimler type of that period.
John deftly lifted off the thin veneer hood of the airplane, and disclosed a very small four-cylindered rotary pneumatic engine of bewitching simplicity and lightness, which a baby could have held out in its pudgy palm. "Paul has worked this little motor out of aluminum and brass and steel, from odds and ends," said John. "With more or less help on the part of my elder brother," interjected Paul.
With these engines the cranks are so placed that two regular impulses are given to the crankshaft for each cycle of working, an arrangement which permits of very even balancing of the inertia forces of the engine. The Darracq firm also made a four-cylindered horizontal opposed piston engine, in which two revolutions were given to the crankshaft per revolution, at equal angular intervals.
"Walter can run a machine I'm perfectly willing to grant you that, Jack. But this is my machine, and I intend to run it." The girl stepped over to a window and looked out. There, on the driveway, stood a new automobile. Four-cylindered, sliding-gear transmission, three speeds forward and reverse, long-wheel base, new ignition system, and all sorts of other things mentioned in the catalogue.
In 1910 J. S. Critchley compiled a list showing the types of engine then being manufactured; twenty-two out of a total of seventy-six were of the four-cylindered vertical type, and in addition to these there were two six-cylindered verticals.