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Monthly Archives: October 2013
Things are starting to get cold now in Minnesota and all nature's creatures are looking for a nice warm place to stay for the winter -- including me. Today's photo shows a frog who found one of my optical network … Continue reading
I had another optical failure related to bug intrusion. I do not yet understand how the bugs do it, but somehow they increase my optical loss enormously. This particular optical node was not properly sealed and box elder bugs got … Continue reading
Sometimes a simple graph is all you need to provide you the clue you need to solve a mystery. Currently, I am working on reducing the failure rate of Avalanche Photo-Diodes (APDs). I found a histogram was useful in my … Continue reading
Quote of the Day Only enemies speak the truth. Friends and lovers lie endlessly, caught in the web of duty. — Stephen King I saw this photo posted by Robert Frost here. It shows a flame on Earth (left) and … Continue reading
I like to watch authors discuss their history books on BookTV. I listen to BookTV while I work around the house. One weekend, I heard two historians (I did not write down their names) discussing World War 2 and each mentioned a statistic that sounded something like this (my wording). Continue reading
Introduction I love to look for physical interpretations of various constants. Sometimes it is impossible to come up with an interpretation, but such is not the case for the ballistic coefficient. This morning I read a very solid piece of … Continue reading
A projectile with a large ballistic coefficient is less affected by drag than a projectile with a smaller ballistic coefficient. We can use the the ballistic coefficient to compare the effect of drag on different projectiles. A 16-inch projectile goes so much farther than a rifle bullet because the drag on the 16-inch projectile is relatively small compared to its momentum. Ultimately, this is because mass increases by the cube of the projectile dimensions and drag increases by the square of the projectile dimensions. This means that larger projectiles tend to have higher ballistic coefficients and drag has less effect. Continue reading
I have had several people ask me questions about the Pejsa ballistic model (previous post) and I thought it would be useful to include some additional posts on the topic. In this post, I will discuss how the formula and parameters were determined for the velocity versus range formula for the range of velocities from 1400 feet per second to 4000 feet per second (sorry about the use of US customary units). Continue reading