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(More customer reviews)Modern Exterior Ballistics
The Launch and Flight Dynamics of Symmetric Projectiles.
I Want to Keep This Book. Thanks to the auspices of interlibrary loan, it's mine for three weeks. That's not enough. This book really has said everything there is to say about the subject, except for the classified data you would need to calculate trajectories of actual projectiles in the inventory.
Chap 1. A Brief History of Exterior Ballistics - nice shadowgrahs of near sonic and super sonic projectiles. Large drawings of several shell types showing how they are dimensioned.
Chap 2. Aerodynamic Forces and Moments Acting on Projectiles - you have to read this chapter if you are going to understand the symbols.
Chap 3. The Vacuum Trajectory-high school math with interesting examination of the effects of firing up hill or down hill.
Chap 4. Notes on Aerodynamic Drag - just what it says. There is a nice set of shadowgraphs showing a shell at successive mach numbers from sub sonic to transsonic to supersonic. Discussion of ogives, Meplats, burning tracer (provides a little thrust and more range), fins, and yaw.
Chap 5. The Flat-Fire Point Mass Trajectory-if you assume that the trajectory is fairly flat (such as with all small arms, rifles, and tank to tank combat), the effect of verticle motion on the down range motion can be neglected. Approximate the drag function by a simple (and useful) analytic function and you get some managable equations.
Chap 6. The Siacci Method for Flat-Fire Trajectories - More of the above, only the integrals are tabulated for several standard drag functions (about five pages for each drag function). Those tables plus pencil and paper and you too can calculate how far the 0.308 bullet travels and how fast it is going when it hits and at what angle it strikes.
Chap 7. The Effect of Wind on Flat-Fire Trajectories - head winds, tail winds, cross winds: pretty much what you would expect.
Chap 8. The Point-Mass Trajectory - the point mass doesn't yaw or pitch so we only have to worry about its three linear velocities. It only has to contend with the zero yaw drag function, air density, gravity and the Coriolis force. (These last three data sets are not classified). A 417 line basic program is included. With this you can calculate your rifle shots better than you can aim.
Chap 9. Six-Degrees-of-Freedom (6-DOF) and Modified Point-Mass Trajectories - The whole enchilada. Three linear velocities and three rotational velocities are considered. They are all coupled to each other by nonlinear functions, and the (ten or so) coefficients are functions of velocity and air density. Fascinating graphs of gyrating pitch and yaw of a 105mm projectile as it goes down range are included. Then come the modified point mass trajectories. This simplification reduces the degrees of freedom from six to four which allows some of the coefficients to be set to zero while still revealing considerable interesting behavior. The forth degree of freedom is angular velocity of the bullet along its long axis.
Chap 10. Linearized Pitching and Yawing Motion of Rotationally Symmetric Projectiles - ok, another simplification: assume that the pitching and yawing motions are small and linearize the functions. There is still a nasty differential equation, but you can (sort of) solve it and predict such things as the stability of the bullet as it goes down range without a numerical integration.
Chap 11. Linearized Swerving Motion of Rotationally Symmetric Projectiles - same idea as chapter 10, but applied to the position of the projectile's center of mass.
Chap 12. Lateral Throwoff and Aerodynamic Jump - what to do about unbalanced projectiles.
Chap 13. Nonlinear Aerodynamic Forces and Moments. - I don't know; I ran out of time.
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Modern Exterior Ballistics is a comprehensive text covering the basic free flight dynamics of symmetric projectiles. The book provides a historical perspective of early developments in the 19th century, the technology leading to World War I and that throu
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