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© Mark Biegert and Math Encounters, 2013. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Mark Biegert and Math Encounters with appropriate and specific direction to the original content.
Monthly Archives: January 2011
Computing the Age of the Universe
Introduction While in the lunch room at work, I often look at the paper. The paper one day this week had an article on the farthest object that has yet been observed by astronomers. One of the guys in my … Continue reading
Posted in Astronomy
2 Comments
Modeling Drag — Projectile Velocity Versus Range
Introduction As mentioned in a previous post, I am reading the book “Modern Practical Ballistics” by Pejsa. I have been working through some of the derivations in the book and they are interesting enough (at least to me) to be … Continue reading
Posted in Ballistics
12 Comments
Ogives Versus Other Shapes
The ogive has long been used in projectile design because it simple to manufacture. Over the last few thousand years, people have gotten pretty good at making sections of spheres. However, simple to manufacture does not mean minimum drag. The … Continue reading
Posted in Ballistics
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Ogives and Battleships
Introduction The previous two blogs looked at the ogive shape and its use in describing bullet shapes. While cruising around the web, I noticed a rather large ogive shape that I thought was interesting. I am a big fan of … Continue reading
Ballistics, Ogives, and Bullet Shapes (Part 2)
Example One: Sierra 308 Caliber, 155 grain, MatchKing. We will first compute the mass for the Sierra MatchKing projectile (tangent ogive) shown in Figure 10. Observe that this projectile has a flattened nose, called a meplat. Because of the meplat, … Continue reading
Posted in Ballistics
2 Comments
Ballistics, Ogives, and Bullet Shapes (Part 1)
Introduction I have always been interested in the shooting sports, but I have not pursued any of them while I was raising my kids. I suddenly find myself with my kids gone and my interest in shooting has reappeared. As … Continue reading
Posted in Ballistics
10 Comments
Pope Gregory XIII and Dual Modulus Counters
Introduction I discussed a recent dual-modulus counter design in a previous post. I had not thought much about the history of these counters, but I noticed that our calendar is really a dual-modulus counter. Pope Gregory XIII established the Gregorian … Continue reading
The Difficulties Posed By Communications
My company currently has engineering work occurring at a number of sites that are widely separated geographically. Trying to coordinate these sites is definitely a challenge. However, this really is nothing new. When I was at HP, my first manager … Continue reading
The Law of Employee Retention
I was just interviewing a large number of people as part of an acquisition. After the interviews were done, the interviewers all went out to dinner and discussed the day’s events. While at dinner, the topic of employee retention came … Continue reading
