The Airplane a Practical Discussion of the Principles of Airplane Flight
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Fig. 87 shows the distribution of pressure on the two planes of a biplane. It will be noted that the negative pressure on the top surface of the lower plane is much less than the corresponding nega- tive pressure on the top surface of the upper plane. This of course means a decrease in lift. This decrease may be made less (i) by increasing the gap between the planes; (2) by giving the planes a stagger so that the upper plane is in advance of the lower, as in Fig. 88; and (3) by increasing the a...spect ratio and thus decreasing the chord.
Fig. 87. Distribution of pressure on a biplane. Negative pressure on upper surface of lower wing is much reduced by interference with the upper wing.
0. 4 0. 8 I. O 1. 2 1. 6 0. 61 0. 76 0. 81 0. 86 0. 89 0-75 0. 79 0. 81 0. 84 0. 88 SINGLE AND MULTIPLE PLANES 181 Biplane correction.
On account of the interference between the planes of a biplane, both lift and L fD ratio are reduced. This reduction becomes less as the gap is increased, as shown by the following table from National Physical Laboratory data for dn inci- dence of 6; little is gained, however, by making the gap greater than the chord.
What to read after The Airplane a Practical Discussion of the Principles of Airplane Flight?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Bedell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Fig. 87 shows the distribution of pressure on the two planes of a biplane. It will be noted that the negative pressure on the top surface of the lower plane is much less than the corresponding nega- tive pressure on the top surface of the upper plane. This of course means a decrease in lift. This decrease may be made less (i) by increasing the gap between the planes; (2) by giving the planes a stagger so that the upper plane is in advance of the lower, as in Fig. 88; and (3) by increasing the a...spect ratio and thus decreasing the chord.
Fig. 87. Distribution of pressure on a biplane. Negative pressure on upper surface of lower wing is much reduced by interference with the upper wing.
0. 4 0. 8 I. O 1. 2 1. 6 0. 61 0. 76 0. 81 0. 86 0. 89 0-75 0. 79 0. 81 0. 84 0. 88 SINGLE AND MULTIPLE PLANES 181 Biplane correction.
On account of the interference between the planes of a biplane, both lift and L fD ratio are reduced. This reduction becomes less as the gap is increased, as shown by the following table from National Physical Laboratory data for dn inci- dence of 6; little is gained, however, by making the gap greater than the chord.
What to read after The Airplane a Practical Discussion of the Principles of Airplane Flight?
You can find similar books in the "Read Also" column, or choose other free books by Frederick Bedell to read onlineMoreLess
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