A-20 Havoc in action No 144 by Jim Mesko, Joe Sewell, Don Greer

By Jim Mesko, Joe Sewell, Don Greer

Constructed out of the DB-7 sequence of sunshine bombers. A-20s, Havocs & DB-7s observed motion in nearly each significant theatre of operation in the course of WWII. Used as a mild bomber, floor strafer & nightfighter. Over a hundred pictures, forty aspect drawings, three pages of scale drawings, thirteen colour work, 50 pages.

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A;::;:;;;;;;;;;;;:t;;:;;;;:;;;.......... -"""_""'--......... - o J S ..... 8 10 Seconds a: Statically and dynamically stable b: Statically unstable and dynamically stable Fig. 1 Stability clearly dependent on the stability of the aeroplane. It should be noted that the damping of the dynamic oscillatory component of the responses shown was deliberately chosen to be low in order to illustrate best the static and dynamic stability characteristics. In establishing trim equilibrium the pilot adjusts the elevator angle and thrust to obtain a lift force sufficient to support the weight and thrust sufficient to balance the drag at the desired speed and flight path angle.

86021. Aerodynamics Series, Vol. 9a, Stability of Aircraft. Engineering Sciences Data, ESDU International Ltd. Etkin, B. 1972: Dynamics of Atmospheric Flight. John Wiley and Sons, Inc, New York. Hopkin, H. R. 1970: A Scheme of Notation and Nomenclature for Aircraft Dynamics and Associated Aerodynamics. Aeronautical Research Council, Reports and Memoranda No. 3562. , Ashkenas, I. and Graham, D. 1973: Aircraft Dynamics and Automatic Control. Princeton University Press, Princeton, New Jersey. 1 Trim equilibrium PRELIMINARY CONSIDERATIONS In normal flight it is usual for the pilot to adjust the controls of an aeroplane such that on releasing the controls it continues to fly at the chosen flight condition.

As far as is reasonably possible, the notation and nomenclature used throughout this book corresponds with that of Hopkin (1970). By making the appropriate choice of axis systems, order and consistency may be introduced to the process of model building. The importance of order and consistency in the definition of the mathematical framework cannot be overemphasized since, without either, misunderstanding and chaos will surely follow. Only the most basic commonly used axes systems appropriate to aeroplanes are discussed in the following sections.

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