Aviation and Aeronautical Engineering Volume 8

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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. 1920 Excerpt: ...length of landing run can be determined at once. At present there appears to be little experimental data available for the verification of the above formula under conditions of service. On May 23, 1919, a comparative test was conducted by the Air Mail Service on the Curtiss R-4-L and the Curtiss HA mail machines at Roosevelt Field, which has well-sodded ground and was in good, dry condition at the time of the test. Data on the two machines are given in the accompanying table. Applying the formula previously given for the length of Excerpt from a paper presented at the Aeronautic Meeting of the Society of Automotive Engineers, March 10. 1920. landing run gave values of 560 and 750 ft. respectively for the two machines. The actual test results were 539 and 711 it. respectively. These results, even though based only upon two tests, are encouraging. It would seem that, with reasonable accuracy in the assumptions, concordance can be expected between the actual length of the run and the computed results such as are indicated. It is interesting to review these results. A hasty consideration of the two machines might have led to the conclusion that the R-4-L machine, with its lower landing speed, higher tractive resistance and uglier design, would have had a much shorter landing run than that of the HA machine, whereas the latter actually had a shorter run. This can be explained only by the fact that the HA machine can be set down at a larger angle, and the wings thus furnish an enormous resistance. It is the importance of a large angle of incidence for the wings which is emphasized. It is interesting in this respect to quote from some experiments made by the British Royal Aircraft Factory. Tests were conducted on the B.E. 2e and R.E. 7, two well-known British mach...
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