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Updated: June 3, 2025
The rotary air-cooled type has its uses, and for them it will probably remain among the range of current types for some time to come. Experience of matters aeronautical is sufficient to show, however, that prophecy in any direction is most unsafe.
Of the twelve types of 1910, only two were water-cooled, and it is to be noted that these two ran at the slowest speeds and had the lowest weight per horse-power of any. The Anzani radial was considerably developed special attention being paid to this type by its makers and by 1914 the Anzani list comprised seven different sizes of air-cooled radials.
These A.B.C. radials have proved highly satisfactory on tests, and their extreme simplicity of design and reliability commend them as engineering products and at the same time demonstrate the value, for aero work, of the air-cooled radial design when this latter is accompanied by sound workmanship.
Of these the smaller size was air-cooled, with cylinders of 4.5 inches bore and 5 inches stroke, developing the rated power at 1,230 revolutions per minute, with a weight of about 5 lbs. per horse-power. The 100 horse-power size had cylinders of 5.5 inches bore, developing its rated power at 1,230 revolutions per minute, and weighing only 2.75 lbs. per horse-power.
A momentary diversion followed, during which Eleanor fancied there was something wrong with the radiator and expatiated at length on her preference for air-cooled cars. Quin listened patiently. A gentleman more versed in social subtleties would have accepted the hint and said no more. But he was still laboring under the error that language was invented to reveal rather than to conceal thought.
I think too, of dainty emerald scarves that are seen and lost in a flash at a dance; of the air-cooled, living green of curling breakers; of a lonely light that gleams to starboard of an unknown passing vessel, and of the transparent green of northern lights that flicker and play on winter nights high over the garish glare of Broadway.
The De Dion firm, also, made Vee-type engines in 1914, being represented by an 80 horse-power eight-cylindered engine, air-cooled, and a 150 horse-power, also of eight cylinders, water-cooled, running at a normal rate of 1,600 revolutions per minute.
Astro and Shinny followed Connel's jet boat in a long sweeping dive to the surface of the satellite. Stepping out of the air-cooled jet boat onto the torrid unprotected surface of the flat plain was like stepping into a furnace. Even with space suits as protection, the five Earthmen were forced to work in relays in the digging of the hole for the reactor unit. "Attention! Attention!
At last, in despair of receiving recognition in his own country, he sold it to Russia and Belgium. The Lewis gun, which is air-cooled and weighs only twenty-nine pounds less than half the weight of a soldier's equipment fires a thousand shots a minute. In the fighting around Sempst I saw trees as large round as a man's thigh literally cut down by the stream of lead from these weapons.
As will be seen, these were long days, and although he did not say it, Day must have felt the crushing disappointment of the failure of the motors it was not his fault, it was a question of trial and experience. Nowadays we have far more knowledge of air-cooled engines and such crawling juggernauts as tanks, for it may well be argued that Scott's motor sledges were the forerunners of the tanks.
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