411-External Ballistics Primer for Engineers - Part II: Test Equipment
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This course was written to introduce engineers of any discipline to the basics of external ballistics. The engineer will gain a general understanding of many of the factors, effects and forces which affect the flight path of a projectile in unpowered flight.
In part one of this external ballistics course several factors were introduced which affect the flight of a ballistic projectile. Some basic equations were presented that are useful to a great many engineers outside of ballistics for making approximations with a fair bit of accuracy. Several flow regimes that a ballistic projectile may pass through were also treated, though there were cases that were omitted for either lack of space or complexity. Fast forward to part deux. Projectiles launched from earth generally move through air for most or all of their flight, which means understanding the properties of that air is very important. Besides air there are other flightpath modifiers including Coriolis’ effects, so many times it is important to know the direction the projectile is headed in and its speed. The list of measurement equipment used in relation to external ballistics research is extensive, however there are tools which may be more noteworthy or common than others. The balance of this part of the full course delivers descriptions and general information of some of the equipment used to measure atmospheric air pressure, humidity, windspeed, wind direction, projectile speed and direction. There are also a few characteristic comparisons in table form appended to a handful of the sections.
The tools that follow are used throughout much of engineering and research rather than being confined to external ballistics, so it is likely you have used at least some of them in relation to your own work.
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