15-06-2012, 05:02 PM
Study of the Guided Missile
Guided Missile.ppt (Size: 1.17 MB / Downloads: 66)
Excuses:
Perhaps it should first be said that this is a difficult project to write in the context of this assignment. Cruise missiles are not a natural resource, and the production of them is not transparent enough to adequately track the entire product life cycle from cradle to grave without further investment of time and research.
Another point to be made is that while the use of natural resources for producing these weapons is significant, it’s quite small in comparison to industries like the automotive or commercial aerospace industries. Accordingly, I place less emphasis on the exploitation of these materials and the communities affected by production and extraction, and instead focus on variables more relevant to the topic and the approach to this study…
Explanation:
In the study of the guided missile industry in the US, I found that there was little information about contaminants in the production facilities and the areas that surround them. While I do not wish to completely dismiss the exceptions (there were many), upon closer inspection, I found that the actions of these corporations and their #1 customers (the Pentagon) outside of the US were far more appalling (see Vieques, Puerto Rico).
Consequently, I devote more attention to the problems of missile testing and disposal using Maehyang-ri as a case study. This provides an excellent example some of the non-conflict related repurcussions of missiles and other incendiary devices.
Bill of Materials
While the materials that make up cruise missiles are classified, it can be safely assumed that there is a good deal of aluminum, plastic, and steel alloys involved in the production of the frame. Additionally, there are lightweight and heat resistant ceramic compounds, as well as structural plastic (some ‘corrugated’, and some structural foam). The engine is largely composed of aluminum and steel alloys, as well as the fuel tank. In the tomahawk missile, the fuel supply is a solid fuel compound, which undoubtedly contains nitrogen, some powdered metal, crystalline oxidizer, and a polymer (plastic) binding agent. The launch tube is made of a special resin (plastic) that is monofilament wound for stability and endurance (but not re-use!) In this section, I go into details of the missile’s materials and their sources.
Aluminum
makes up most of the outer hull, and much of the structure for the frame. Aluminum is the third most commonly used metal in industry, after iron and steel. It is used here (and typically for aeronautical purposes) because it’s lightweight, and in some cases stronger than steel. Aluminum occurs naturally, but for industrial purposes, it is extracted from bauxite ore. There are numerous bauxite deposits worldwide, mainly in the tropical and subtropical regions, but also in Europe and the southeastern United States. Bauxite is generally extracted by open cast mining from strata, typically some 4-6 yards thick under a shallow covering of topsoil and vegetation. Aluminum is extracted from bauxite ore in a process that requires incredible amounts of electricity, which is the key reason for its higher cost relative to steel. Recent examples of indigenous peoples being upset/displaced by bauxite mining operations can be seen in the cases of Alcoa Mining company in Indonesia (under Suharto) and in the acts of civil disobedience in response to Hydro Aluminum’s operations in India.
Steel
is used in reinforcement, the fuel tank and in smaller hardware (In the Tomahawk, some of these may be substituted for titanium). Its advantages are low cost, a wide range of attainable mechanical properties, and a high modulus of elasticity (ductility). Steel is primarily iron and carbon, and is processed and alloyed with other metals to achieve different properties. Iron ore is mined worldwide, and the US, not surprisingly, is the biggest importer. To become steel, iron is melted in a blast furnace to remove impurities, then goes through a series of cooling, reheating and/or “cold working” processes to achieve the desired properties. Steel is typically alloyed with Nickel and/or Chromium, though it is often processed with other metals as well. Industrial iron mining practices strip the land, leak toxins into the earth/water supply, and displace people. Steel mills release ash and other emissions in the air, as well as decreasing the quality of life of those who work and live in and around them.
How it works
The cruise missile has been described as a revolutionary new weapon, but in concept and use, the idea has been around for a while. The first cruise missile was the German V-1, or the “buzz bomb”, used in World War II. After the war, the U.S. and Soviet Union began steady proliferation of guided missiles, though none approached any real measure of accuracy until the mid-1970s. It was during this period that work first began on the SLCM (Sea Launch Cruise Missile) Tomahawk Program.
Cruise missiles are named for the small turbofan engines—similar to those found on commercial airliners—which they use to “cruise” to their targets. During launch, a solid propellant rocket fires the Tomahawk to sufficient altitude. The turbofan engine then takes over for the cruise portion of flight. Cruise missiles are very effective because they are difficult to detect. They have a small cross-section, and fly at very low altitudes. Infrared detection is difficult because turbofan engines emit little heat. The sea-launched missiles are 18.25 feet long. It weighs 2,650 lbs and has a range of 690 miles.
The Tomahawk missile, like all cruise missiles, is essentially a drone—a remote controlled airplane that explodes on contact. Like a military fighter, it uses a jet engine, and comes complete with wings and a tail. Cruise missiles form the spearhead of the US arsenal. There are currently two types of cruise missile in service: the air-launched AGM-86 and the Tomahawk BGM-109 ship or submarine-launched version. They can both be fitted with “conventional” payloads or with nuclear warheads.