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Aviation History
1936
1936 - 2275.PDF
204 FLIGHT. AUGUST 20, 1936. In Fig. 1, on the left, the tufts show that most of the port half of the front wing was stalled, due probably to a certain amount of sideslip. The beniing inward of the flow at the trailing edge near the tips is seen in Fig. 2, above. The lower photograph shows a Pou on test in the large wind tunnel at Farnborough. It can be clearly seen from Fig. i that most of the port half of the wing has stalled, while the starboard half has not yet gone ; this is apparently due to the fact that the machine was flying with about three degrees of side slip (port wing back). The bending inward of the flow at the T.E. near the tip is of interest in connection with the recent photographs in Flight on this subject, but it is not suggested here that all that bending is due to the plan form of the wing ; it is clear from Fig. 2 and from other photos taken just before the stall, and from visual observation that the bending was more marked and ex tended forward over a greater portion of the chord than one would expect from the plan form alone, and it is highly probable, in the writer's opinion, that the suction of the rear wing was influencing the flow as claimed by M. Mignet. On the other hand, it is quite clear that the front wing does—on this machine at least—stall quite thoroughly with the stick well back ; the gap,- of course, is greater than in M. Mignet's design, and in the absence of a test on that type there is room for doubt as to whether its stalling qualities are similar to the Cantilever. It can be seen from Fig. 2 and some of the other photos taken, that the front wing began to stall at the T.E. a little before the remainder of the wing, but the stall could not be said to spread gradually forward—the breakdown appears to be quite rapid. The flow over the rear wing is somewhat divergent—apparently due to the flow from under the front wing. The tests were not so prolonged as one would have liked, but the machine from which the photographs were being taken was not very suitable for the work and it was not desired to do more than was really necessary and so pro long Mr. Appleby's suspense, as he had no upward view.
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