Textbook in PDF format

Computational Modelling and Simulation of Aircraft and the Environment. An in-depth discussion of aircraft dynamics modelling and simulation. This book provides a comprehensive guide to modelling and simulation from basic physical and mathematical principles, giving the reader sufficient information to be able to build computational models of aircraft for the purposes of simulation and evaluation.
Preface
Aerospace Series Preface
A Simple Flight Model
Equations of Motion
Fixed-Wing Aerodynamics
Longitudinal Flight
Gas Turbine Dynamics
Additional Topics