function [Cyr,Cyr_v]=Cyr2(CLa_v,Xh,b_v,eta_v,S_v,S_w)

%Cyr_v=-2/b_v*(l_v*cos(a)+Z_v*sin(a))*CyB_v;	%eqn 9.2
Cyr=CLa_v*(2*Xh/b_v)*eta_v*(S_v/S_w);    %white book pg 157

Cyr_v=Cyr;	%eqn 9.1