horizontal tail volume ratio, because the quantities in the numerator and the denominator of the ratio have units of volume (area multi-plied by length). The lift coefficients of the wing and horizontal tail are expressed in terms of their angles of attack and lift curve slopes:
As with the analysis in Section 6.3, the horizontal tail is assumed to have a symmetrical airfoil section, so . Also, from Figure 6.12, t = it, so:
(6.7)
. Also, from Figure 6.12, t = it, so:
(6.7)
is defined as the