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St
Sv
Fig.3.79   Empiricalparameter KH as a function,SlSy (Ref.l).
STATIC STABILITY AND CONTROL
Fig.3.80    Side force and yawing moments on verticaltail.
277
The parameter 'V2 iS often called the vertical tail volume ratio. The suffix *ifix"
denofes the rudder-fixed condition.
       For supersonic speeds, no general method is available for estimating the vertical
tail contribution to the directional stability. The flow field around the vertical
tail is quite complex because of the presence of shock waves emanating from
wing, fuselage, and horizontal tails in addition to the shock waves caused by the
　
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