This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ... noted experimentally, and have been made the subject of quantitative measurement in a series of experiments carried on by the author. This is what is frequently referred to by the statement that the addition of thickness results in a virtual increase of pitch, because if the equivalent pitch be taken as (longitudinal ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ... noted experimentally, and have been made the subject of quantitative measurement in a series of experiments carried on by the author. This is what is frequently referred to by the statement that the addition of thickness results in a virtual increase of pitch, because if the equivalent pitch be taken as (longitudinal speed for zero thrust)--(revolutions), the result will be greater than that derived by the measurement of the driving-face, and the excess would be still greater could the tangential forces be eliminated. We have thus discussed various possible definitions of mean pitch and mean slip in order to show the variety of meaning which may be given to these terms, and the consequent inexactness of significance attending their use without some agreement as to the basis of definition. Our use of the equations of 36 will virtually assume the definition of mean slip as based on (e). That is, we shall assume, as will be Carnegie Institution. Publication. Number 79. explained later, that for the actual variable slip may be substituted some constant equivalent value for use in the equations giving the value of the total useful work. In regard to propellers of variable pitch it may be noted that such design is usually intended to provide for some variable distribution of slip over the surface, assuming the propeller to work in a uniform stream. When, however, we remember the great variability of the stream or wake, it is quite evident that any attempt to secure any specified distribution would be entirely futile, and that in any given case the actual distribution will be quite different from that intended. Hence any effects resulting from a variable pitch will be quite accidental, and it is very doubtful if, in the present state of our knowledge, ther...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.