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Wind-tunnel Investigation of Control-surface Characteristics

其他書名	23 - A 0.25-airfoil-chord Flap with Tab Having a Chord Twice the Flap Chord on an NACA 0009 Airfoil
出版	National Advisory Committee for Aeronautics, 1945
URL	http://books.google.com.hk/books?id=JT9n2-mfqRQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋Summary: Wind-tunnel tests have been made to determine the aerodynamic section characteristics of an NACA 0009 airfoil with a plain flap having a chord 25 percent of the airfoil chord and a balancing tab having a chord 50 percent of the airfoil chord or 200 percent of the flap chord so linked that the tab would deflect at a given rate with respect to the flap. Three linkage ratios were tested on the model. The tests indicated that the flap and tab could be linked to give hinge-moment balance with flap deflection and with angle of attack and yet have greater lift effectiveness than a plain flap of similar size with a conventional balancing tab having a chord 20 percent of the flap chord linked to give hinge-moment balance with flap deflection only.