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Aviation History
1921
1921 - 0733.PDF
NOVEMBER IO, 1921 THE HANDLEY PAGE W8.—Our photograph shows this machine, which has two Napier "Lion" engines, starting off for its first flight to Paris, which was made in two hours five minutes. thinner sections which formed the subject of the earlier experiments. Lift coefficients of well over one (absolute) have already been obtained, and work is progressing on so shaping the slots and sections that the high-lift coefficients occur at reasonably low angles. (A maximum-lift coefficient, even if of great magnitude, is of comparatively small prac- tical value if it occurs at an angle of 30 or 40 degrees.) A considerable amount of success has already attended these experiments. The accompanying photographs show a Handley Page slotted wing mounted on the fuselage of a D.H.9A. The machine is comparatively crudely made, but it has served to demonstrate that the scale effect is normal for a slotted wing, and also that the slotted ailerons fitted are effective up to the angle of maximum lift. A more refined machine is now being built, and the full-scale experiments will then be continued with the latest forms of slots. To show the manner in which improvements have been effected in the results of tests on the wing with which the machine shown in the illustrations is fitted, we will give the data of the section used. This is the " Propeller section No. 4 " from Reports and Memoranda No. 322. The data for the solid section are as follows :— Angle -4-2 o 2 4 K, Angle -4•089 14•700 •163 -234 -308 -384 -453 16 18 20 2.1 24 •746 -774 -774 -434 -425 8 •518 20 •510 10 12 583 -04328 — For the section used on the machine, which is " airscrew 4 " with one slot, the values of the lift coefficient are as follows : Angle -4-20 2 4 6 8 10 12 K, K,'Angle 14•66 16 •737 18 •790 i87 20 836 •194 22 •885 •268 24 •94 1 •398 26 •01 1 •485 28 •03 1 •575 30 •02These figures relate, of course, to the section with the slot open. When the slot is closed the figures are practically the same as those for the standard solid " airscrew No. 4." By continued experiments, and with a differently shaped slot, but with the slotted aileron set permanently at an angle of 23 degrees, the same original section, i.e. " airscrew 4," gave the following results :— Angle -4-20 2 4 •308 •586 -667 -715 -796 22 24 26 28 12 •872 30 •417 -428 -496 Angle 14 16 18 20 Kj, .. 978 1 033 991 I-IOI 1 255 978 — — — One result of the further experiments is, it will be seen, that the lift coefficient of 1.03 occurs at 16 degrees instead of at 28 degrees as in the older section with which the machine is actually fitted. This is, in itself, an improvement of the greatest practical value, as it allows the machine to be landed at the angle of maximum lift without having to get the tail down to a dangerous extent. We should like to go further into the matter, but space does not allow of doing so here. We hope, however, to return to the subject in a subsequent MARTINSYDE, LTD. WOKING, SURREY. THE firm of Martinsyde, Ltd., dates back to the very early firm were all monoplanes of extremely pleasing appearance. days, when the title had not yet been contracted into Martiri- syde, but was Martin-Handasyde. The first efforts of the It was quite a number of years before Mr. Handasyde could be persuaded to design biplanes. When he ultimately did he The Martinsyde F.4a (300 h.p. Hispano) two-seater biplane. . "733
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