دانلود کتاب بالستیک، نظریه و طراحی اسلحه و مهمات، ویرایش چهارم

The fourth edition of Ballistics: Theory and Design of Guns and Ammunition continues the process of locating and correcting errors that have crept into the text simply due to the large number of equations. At some point, there will no doubt be material that will be removed, but we are not there yet. As in the third edition, very few problems were added. After receiving many requests for it, we added a new chapter (new Chapter 7) on the use of closed vessels to derive propellant burn rates. This is a commonly asked question and is instructive to the interior ballistician to understand how these properties are obtained. Much of this chapter was developed by one of my graduate students, Dr. Christopher Houthuysen, whose work in this area is incredible. Mr. John Ritter, another one of my graduate students who now works at the Army Research Laboratory contributed to this chapter as well. John has done numerous papers that have contributed substantially to the understanding of small arms ballistics. The untimely passing of Nathan Okun, a long-time friend, precluded the expansion of the ogival projectile penetration work. I will miss him, as will the community overall. Dr. Nathaniel Helminiak, an instructor at the US Military Academy (USMA) at West Point, has graciously shared with me some comments and corrections to some of the exterior ballistics sections. The USMA has been using the textbook for several years now, and I have had the honor and privilege of attending some of its classes as a guest lecturer. It is certainly humbling to talk with the smart, energetic, and dedicated cadets who fill the ranks of the US military. My daily work focuses on serving them, and I hope I can make a difference. In choosing colleagues for chapter reviews, I was surprised and humbled by the enthusiastic response I received. Luminaries, such as Drs. James Walker, Sidney Chocron, Clive Woodley, and George “Rusty” Gray, immediately and enthusiastically responded to my request, each in turn describing how they got the book and what they used it for. Mr. Paul Locking was also a reviewer. He has a special place here because, in serving with him on one of the committees of the International Ballistics Society, the first words out of his mouth when I met him every year-and-a-half were “When is the next edition of the book coming out?” Well, Paul, here it is. Thank you. Mr. Ray Sicignano, a great friend, colleague, and artist, agreed to create the cover art. It depicts an M982 Excalibur projectile in flight. Excalibur was the world’s first fielded GPS-guided projectile. During this program I was fortunate enough to be part of the team of scientists and engineers from the US Army, Raytheon Systems and Bofors, plus many industry partners. I have fond memories of that program and am so proud of the people I worked with and what we accomplished. At the time, there may have been moments of discourse and angst, but looking back, those were some of the greatest moments in my professional career. I am so glad to have worked with all of you. Every one mentioned in the prefaces to the earlier editions has continued to contribute when they were able, and I am so lucky to have known them and worked with them. As always, I am very interested in hearing about any issues with the text, good, bad, or indifferent. Hopefully the readers will find it helpful.