Principles of Yacht Design

Fig 6.24 Different tvpes of stall

Fig 6.25 Maximum lift for different profiles c

4-dig it

63—series

4-dig it

63—series

Stall angle in degrees

Reynolds number :

12 15 18 21

corresponding to 4-6° at AR = 3), the difference is hardly noticeable and the approximate value. 0.10, of the two-dimensional lift coefficient per degree (CL2D), given above, seems to fit the data quite well. There is, however, quite a difference at high angles of attack. The thin sections tend to stall abruptly, with a large loss in lift as a consequence. The thick sections, on the other hand, exhibit a much more gradual stall, with an almost constant lift. An explanation of the differences may be given with reference to Fig 6.24. When a thick section (case a) stalls, separation occurs on the suction side near the trailing edge. The larger the angle the larger the separated zone, but the changes arc smooth. In the opposite case, ie a very thin section (case b), the flow cannot follow

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