Trajectory Modeling in the Flight Path System
by
David Eagle
19 Nov 2012
Demonstrates how to model the trajectory of aerospace vehicles in the flight path coordinate system.

aerodyn(alpha)

function [csubl, csubd] = aerodyn(alpha)
% aerodynamic properties
% input
% alpha = angleofattack (radians)
% output
% csubl = lift coefficient (nondimensional)
% csubd = drag coefficient (nondimensional)
% STS aero  J. Betts model
% Orbital Mechanics with Matlab
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
rtd = 180.0 / pi;
cl0 = 0.20704d0;
cl1 = 0.029244d0;
cd0 = 0.07854d0;
cd1 = 6.1592d3;
cd2 = 6.21408d4;
alphad = rtd * alpha;
csubl = cl0 + cl1 * alphad;
csubd = cd0 + (cd1 + cd2 * alphad) * alphad;


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