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~~-
2ri
Fig.3.77 Empirical parameter AVcB)lAV as a function ofby/2,ri (Ref.l).
ratio based on vertical tail surface measured up to the fuselage centerline. Ai, is
the geometrical aspect ratio of the vertical tail with span and area measured up to
the fuselage centerline, AvcHB)]AvcB) is the ratio of vertical tail aspect ratio in the
presence of the horizontal tail and body to that of the vertical tail in the presence of
the body alone as given in Fig. 3.78, and K H is a factor accounting for the relative
size of the horizontal and vertical tails as grven in Fig. 3.79.
The vertical tail contribution to static directional (Fig. 3.80) stability with rudder-
fixed is given by
or
where
(NV)tix = YVlr
= kqr7uau(p + U)Su/u
(Cn.V)nx = kay()3 + a)r/u V2
(3.308)
(3.309)
(3.310)
(C,,p.v)rix = kay (1 + ~p) Ov'V2 (3.311)
V2 = SS~
(3.312)
276 PERFORMANCE, STABILITY, DYNAMICS, AND CONTROL
Tail
Tzul
zt
bv
Fig.3.78 Empirical parameter AVcH )lAwa) as a function ofzulby (Ref.1).
K
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