Vehicles of the Air; a Popular Exposition of Modern Aeronautics, With Working Drawings
Vehicles of the Air; a Popular Exposition of Modern Aeronautics, With Working Drawings
Lougheed, Victor
The book Vehicles of the Air; a Popular Exposition of Modern Aeronautics, With Working Drawings was written by author Lougheed, Victor Here you can read free online of Vehicles of the Air; a Popular Exposition of Modern Aeronautics, With Working Drawings book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Vehicles of the Air; a Popular Exposition of Modern Aeronautics, With Working Drawings a good or bad book?
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This speed, as is well under- stood by engineers, is only secondarily a matter of rotational speed, it being primarily a matter of the speed of piston reciprocation. Now to increase to, say, twenty horsepower, the cylinder must be doubled in all of its linear dimensions — in both bore and stroke. In accordance with a well-known law of geometry, this cubes the weights and volumes, so would at first appear to cube the power, which would be the case if the speed of rotation were maintained. But, b...ecause of the piston speed being the limiting factor, it is neces- sary in the larger engine to reduce the rotational speed one-half to avoid increasing the piston speed. The consequence is that though the weight is eight times as great as that of the smaller cylinder, the power developed is only four times as great, with the result that the. weight per given power is doubled. On the other hand, if instead of increasing the dimensions of the small original cylinder the policy be adopted of duplicating this small cylinder — ranging four of them, for example, along a single crankcase and crankshaft— then the power is Digitized by Google 2 Z 2.
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