DURING the past year or so there has been a growing tendency towards the use of small servo flaps on elevators and rudders either for trimming or for balancing. The object of this article is to review broadly the aerodynamic principles which govern their design, their advantages and disadvantages.
Serby, J.E. (1935), "Trimming and Balance Tabs: The Principles, Advantages and Disadvantages of Small‐Chord Flaps on Control Surfaces", Aircraft Engineering and Aerospace Technology, Vol. 7 No. 12, pp. 303-305. https://doi.org/10.1108/eb037655
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