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At the outbreak of war the most successful machines possessed by the Military Wing were the B.E.2 tractor with a 70 horse-power Renault engine, a speed of 73 miles an hour, and a climb of 3,000 feet in nine minutes; and a Henri Farman pusher with a speed of 60 miles an hour, and a climb of 3,000 feet in fourteen minutes.

When everything was going to his complete satisfaction, he leaned back and fairly shook with suppressed laughter. He knew now that he had those rascals prisoners for a few hours at least, and in that time much could be done. The engine was of six horse-power, and the craft an ordinary rafting-boat, built especially for towing.

Development of the early Daimler type brought about the four-cylinder vertical Mercedes-Daimler engine of 85 horse-power, with cylinders of 5.5 diameter with 5.9 inch stroke, the cylinders being cast in two pairs. The overhead arrangement of valves was adopted, and in later designs push-rods were eliminated, the overhead cam-shaft being adopted in their place.

She was a twelve-hundred-ton, triple-screw, turbine-driven boat, and, thanks to the space-economy of the new system, her builders had been able to stow away fifteen thousand horse-power in her engine-room, and this when fully developed gave a speed in smooth water of thirty-five knots or a little over forty statute miles an hour.

A flying machine that would fly at a speed of 50 miles an hour with engines of 1,000 horse-power would not be upheld by its wings at all at a speed of less than 25 miles an hour, and nothing less than 500 horse-power could drive it at this speed.

By July of 1909 he had fitted an 80 horse-power motor to his biplane, and with this he made a flight of over four miles over Laffan's Plain on July 21st.

Rock breaker 10 effective horse-power Amalgamating pan 5 effective horse-power Grinding pan 6 effective horse-power Single stamp of 750 lb. dropping 90 times per minute 1.25 effective horse-power Settlers 4 effective horse-power Ordinary hoisting lift 20 effective horse-power Allow 10 per cent in addition for overcoming friction.

If higher speed is demanded, increased size is essential, since with even the best result every 100 horse-power added involves an addition to machinery weight of approximately 14 tons and to the area occupied of about 40 square feet. To accomplish this the ship must be as much larger in proportion. The ship designer has to work within circumscribed limits.

"'Bus right up to the town hall!" cried a driver, sizing the trio up shrewdly. "Thank you; that's our auto over there," nodded Tom, pointing to a lunch wagon. Reade started the chums at a brisk walk. Of the first native they met they inquired the way. Tom was still talking at forty horse-power when they came to the town hall. "That building holds our fate!" muttered Dave, as they drew near.

Toward the end of 1903 they fitted to their first practicable flying machine the engine which made the historic first aeroplane flight; this engine developed 30 horse-power, and weighed only about 7 lbs. per horse-power developed, its design and workmanship being far ahead of any previous design in this respect, with the exception of the remarkable engine, designed by Manly, installed in Langley's ill-fated aeroplane or 'aerodrome, as he preferred to call it tried in 1903.

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