AS in the case of end‐plate fins, inset fins have the effect of increasing the effective aspect ratio of the tail plane, but to a somewhat less extent. The tail with fins will be compared with an untwisted elliptical tail without fins, because this method of comparison is very clear and being also used to compare wings of different shapes is familiar to people concerned with aerodynamic problems.
Shenstone, B.S. (1939), "The Modern Twin‐Fin Tail: Further Examples of the Results to be Obtained from Various Arrangements in Use To‐day", Aircraft Engineering and Aerospace Technology, Vol. 11 No. 12, pp. 442-443. https://doi.org/10.1108/eb030579
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