ESDU 91009:2014

$62.40

Effect of twin fins on isolated tailplane lift-curve slope

Published By	Publication Date	Number of Pages
ESDU	2014-07-01	16

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Category: ESDU

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Description

ESDU 91009 provides a method that is based on determining the
effective (increased) aspect ratio of the tailplane due to the end
plate effect of the fins. ESDU 70011 is then used to estimate the
lift-curve slope for that effective aspect ratio. Wind-tunnel data
drawn from the literature for a wide range of configurations were
used to correlate the effective aspect ratio (determined using ESDU
70011) as a function of the ratio fin height/tailplane span and fin
spanwise position. The data were correlated to within 5 per cent
and apply to straight-tapered tailplanes of taper ratio (tip
chord/centreline chord) between 1 and 0.4 and mid-chord sweep up to
45 degrees, for any fin planform, and are independent of fin
vertical location on the tailplane. The method is restricted to
attached flow at subcritical speeds. The ranges of geometries for
the test data used in the correlation are tabulated, sketches show
plots comparing predicted with experimental results, and a worked
example illustrates the use of the method. A computer program of
the method is provided as ESDUpac A9109.