Space Propulsion (2597 words) Essay Example For Students

Space Propulsion (2597 words) Essay Space PropulsionRESEARCH I/IILARRY PECANFINAL REPORT9-27-98INTRODUCTIONThe following is a research project on Space Vehicle Propulsion. It shall consist of four sections, each discussing specific topics. Section One lays out the basic ideas of rocketry. Section Two compares Rocket Propulsion Systems, and shows the basis for the comparison. It also shows how each specific Rocket System works and Section Three gives a description of how Space Propulsion has evolved and contains a conclusion. SECTION 1The BasicsSection One is a brief description of the basic properties of Rocket Systems. It defines the key terms and shows how a basic rocket works. It also shows the State if The Art. I have chosen to do my project on space vehicle propulsion. Basically, this means that my research shall be based primarily on rocketry. Rocketry is a way of propulsion that has developed in numerous ways since it was first used to propel fireworks in the 16th century. It has emerged into an extremely complicated science that few actually understand. We will write a custom essay on Space Propulsion (2597 words) specifically for you for only $16.38 $13.9/page Order now Most space rocketry in America is used in NASA (National Aeronautics and Space Association) space projects. NASA, a government association that focuses on space exploration, is the main user of rocket technology. It is used mostly to power their satellites and shuttles into space. Pushing an object that weighs as much as a space shuttle does directly vertical until escaping the Earths atmosphere requires a tremendous amount of power. This is why NASA uses rockets. Rockets are essentially the most powerful forms of propulsion there is today. Space Vehicle Propulsion is based rocket engines. The basic principle of rocket engine is that when fuel is burned in the engine, the reaction mass is expelled at high speeds. As a result of Newtons law of action and reaction this pushes the vehicle in the opposite direction of the one in which the reaction mass is moving. Thrust is the force that the engine exerts on all space behind it in order to ?push? the vehicle forward. Efficiency is the way that the quality of rocket engines is measured by. It is measured by the time it takes for one kilogram of propellant to create one kilogram of thrust. The goal of my research is to find out what makes these engines more efficient. In rocketry, the state of the art is extremely hard to define, since there are so many different forms of rocketry ranging from liquid propellant rockets to fireworks. The state of the art though is probably nuclear powered rockets. It is much more efficient because it does not use chemical combustion like most rockets do. Instead NFRRs (Nuclear Fission Reactor Rockets) heat hydrogen in a fission reactor which expels the propellant at blistering speeds. Much research is being done with NFRRs. They are still highly experimental because of the dangers that could be associated with them. The NERVA (Nuclear Engine for Rocket Vehicle Application) was one of the most extensive NFRR research projects, however it failed because of the inability figure out an approach to putting the research into a developmental stage. SECTION 2Specific Rocket Propulsion SystemsSection One has laid the foundation for further research in the are of rocketry. Section two shall discuss properties of efficiency in more depth, it shall lay out the types of rockets in existence now. It shall also show which type of rocket is the most efficient. After this section, the next one shall describe how the reasons for these specific rockets efficiency and depending on the outcome of that report, the topic of the fourth shall be decided. EFFICIENCYEfficiency is the most important part of my research as yet. Since the object of my research is to find out which type of rockets are the most efficient and why, the reader of this paper must have a basic understanding of efficiency. Once this is established, new definitions will come into play, all of these shall be crucial in the understanding of the paper. Terms Needed To Understand EfficiencyG- a unit of acceleration Specific Impulse (Isp)- A measurement in seconds of efficiency. Properties of EfficiencyEfficiency is the most accurate indicator of rockets performance. As stated in the aforementioned definitions, specific impulse is the basic unit of measurement of rocket efficiency. Isp is found by dividing the exhaust velocity by g (definition also mentioned above). Since velocity is measured in m/s (meters per second) and each g is equal to 9.8 m/s/s (meters per second every second), the terms cancel to leave just a unit in seconds. The resulting figure, is the duration of time for which one kilogram of propellant can produce one kilogram of thrust. Thus, a higher number represents a better, and more efficient rocket. To give the reader an idea of the average Isp of several type of rockets, I have listed some average figures for efficiency of certain types of rockets below. Average Efficiencies of Certain RocketsNext, I have listed the Isp values for some basic types of rockets. After that I shall explain some of the most well known types of rockets. .ue929b3d509113a612f8780603059c968 , .ue929b3d509113a612f8780603059c968 .postImageUrl , .ue929b3d509113a612f8780603059c968 .centered-text-area { min-height: 80px; position: relative; } .ue929b3d509113a612f8780603059c968 , .ue929b3d509113a612f8780603059c968:hover , .ue929b3d509113a612f8780603059c968:visited , .ue929b3d509113a612f8780603059c968:active { border:0!important; } .ue929b3d509113a612f8780603059c968 .clearfix:after { content: ""; display: table; clear: both; } .ue929b3d509113a612f8780603059c968 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .ue929b3d509113a612f8780603059c968:active , .ue929b3d509113a612f8780603059c968:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .ue929b3d509113a612f8780603059c968 .centered-text-area { width: 100%; position: relative ; } .ue929b3d509113a612f8780603059c968 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .ue929b3d509113a612f8780603059c968 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .ue929b3d509113a612f8780603059c968 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .ue929b3d509113a612f8780603059c968:hover .ctaButton { background-color: #34495E!important; } .ue929b3d509113a612f8780603059c968 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .ue929b3d509113a612f8780603059c968 .ue929b3d509113a612f8780603059c968-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .ue929b3d509113a612f8780603059c968:after { content: ""; display: block; clear: both; } READ: Assignment Art And Culture Paper EssayBasic Rocket TypesAn RPS (rocket propulsion system) is a powerplant that pushes a vehicle forward by ejecting matter that is stored within the vehicle. This matter is called propellant. The propellant is the most crucial part of moving a vehicle through space. Their energy source, the vehicles they are used on, and the type of propellant classify the specific types of systems. Liquid Propellant RocketsAll LPRs (Liquid Propelled Rockets) contain the same basic devices. The next paragraph shall discuss these functions and examine their purpose. The first such device is the thrust chamber. The thrust chamber contains an injector, a combustion chamber and a nozzle. The thrust chamber is the place where the propellants are injected, atomized, then mixed and finally burned to form reaction products in the form of gas. Next, the products are accelerated and ejected at extremely high velocities to create thrust. The injector is a series of pipes that allow the liquid propellant to move into the combustion chamber chamber to be made into thrust while atomizing and mixing them. The exhaust nozzle is the last step in the releasing of thrust. It allows the hot gas to expand and then accelerates them to supersonic velocities. On some vehicles, the nozzle acts as a steering mechanism by placing it on an electronic axis for which it can be turned by an automated steering wheel. There are two major types of feed systems used by LPRs; one uses pumps to move propellants to combustion chambers; the other, uses high pressure to expel propellants from their tanks. On most space vehicles the engines are mounted in pairs at the perimeter of the craft. Normally to opposite facing thrust chambers are controlled automatedly to turn the ship. Generally, a minimum of 12 thrust chambers is required for turning. Solid Propellant RocketsSolid Propellant Rockets (SPRs) contains a huge number of types of engines. The propellant that is to be burned is held in the combustion chamber. The propellant charge (grain) contains chemical elements for complete burning. When it is ignited, it burns on all its exposed sides. If the design of the grain is changed, then less can be exposed; the less exposed, the less fuel burned. The average burning rate is around 1.8 cc per second. The rate normally depends on the propellant ingredients. The more chamber pressure, the more propellant burnt. The way to make an efficient SPR is to pack as much solid propellant into a chamber volume as possible. Theoretically, it would be ideal to burn the propellant like a cigar, from one end to the other. For this reason, scientists created an end-burning grain, which has proved extremely successful. Electric RocketsThere are three types of electric propulsion systems (EPS); the three include electromagnetic, electrothermal and electrostatic. They are, in some ways more a rocket of the future then one of the present, somewhat like the NERVA project (see next section). In the electrothermal system the propellant is heated or vaporized electric heaters. The hot gas is then expanded through a nozzle the way it is in a chemical rocket. In an electrostatic system, interacting electrostatic fields and small charged particles such as colloidal particles achieve acceleration. In an electromagnetic rocket, acceleration is achieved by placing propellant plasma (a high temperature, electrically natural gas that contains electrons, ions and neutral molecular species) in an electromagnetic field thus causing a reaction that releases thrust. Nuclear RocketsUnlike the aforementioned rockets, nuclear rockets do not generate its power through chemical combustion. The way its power is formed, is through nuclear fission. It heats a propellant like hydrogen in a fission reactor and the explosion expels the propellant at amazing speeds, which exceed twice what any other rocket can produce. Its efficiency rating is around 850, as compared to the 450 of the next best ty pe, the cryogenic rocket. Unfortunately due to the extreme dangers of nuclear fission inside a shuttle, the main project for researching the nuclear rockets, NERVA, was scrubbed. Most likely, in the future, scientists will devise a plan to minimize the risks, whereupon research will begin again. SECTION 3A HistoryINTRODUCTIONThe third section of this report shall begin by indicating the steps in which rocketry was created, as to allow the reader of this paper to better understand the way rockets work. It shall show the works of Tsiolkovsky, Goddard, Oberth and a few others. The report shall then end in a detailed conclusion. The conclusion will be based on the summary and discuss all that has been written. It shall end in giving opinions as to the future uses of the specific areas found in the research. Development of Modern RocketryEARLY HISTORYIn around 1232 AD, in China, rockets were created. During the war with the Mongols, the Chinese would strap an early form of gunpowder to the shaft of an arrow. This made them fly longer and faster than any of the regular arrows that the Mongols used. About ten years later, in Europe, another major discovery was made. An Englishman, Robert Bacon, created a more practical formula for gunpowder. He did this by mixing 41.2 parts saltpeter, 29.4 parts charcoal and 29.4 parts sulfur. He was able to distill saltpeter, which produces oxygen, to allow the rocket to burn faster. .u0ca094ea053a68ee495649a056c38f4c , .u0ca094ea053a68ee495649a056c38f4c .postImageUrl , .u0ca094ea053a68ee495649a056c38f4c .centered-text-area { min-height: 80px; position: relative; } .u0ca094ea053a68ee495649a056c38f4c , .u0ca094ea053a68ee495649a056c38f4c:hover , .u0ca094ea053a68ee495649a056c38f4c:visited , .u0ca094ea053a68ee495649a056c38f4c:active { border:0!important; } .u0ca094ea053a68ee495649a056c38f4c .clearfix:after { content: ""; display: table; clear: both; } .u0ca094ea053a68ee495649a056c38f4c { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u0ca094ea053a68ee495649a056c38f4c:active , .u0ca094ea053a68ee495649a056c38f4c:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u0ca094ea053a68ee495649a056c38f4c .centered-text-area { width: 100%; position: relative ; } .u0ca094ea053a68ee495649a056c38f4c .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u0ca094ea053a68ee495649a056c38f4c .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u0ca094ea053a68ee495649a056c38f4c .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u0ca094ea053a68ee495649a056c38f4c:hover .ctaButton { background-color: #34495E!important; } .u0ca094ea053a68ee495649a056c38f4c .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u0ca094ea053a68ee495649a056c38f4c .u0ca094ea053a68ee495649a056c38f4c-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u0ca094ea053a68ee495649a056c38f4c:after { content: ""; display: block; clear: both; } READ: African Americans and Cardiovascular Disease EssayIn the 18th century, the British encounter encountered rocket warfare with India. The Indians probably learned the secret of rocket treat from Arab traders in the 17th century. The Indians, who were led by Hyder Ali, gave thousands of men the task of throwing rockets. The rockets were first thrown, then propelled itself. They attached an eight foot long bamboo stalk to six pound iron tube filled with fuse and powder. The rockets were able to fly up to 1.5 miles. Modern DiscoveriesTsiolkovskyTsiolkovsky, a Russian teacher, established that a rocket would work in the vacuum of space, in 1883. In 1903, he wrote a book explaining how space travel was possible, using liquid propelled rockets. He created drawings of possible space ships propelled by either liquid oxygen and liquid hydrogen or liquid oxygen and kerosene. The sketches also show valves to transport the liquid propellant into a combustion chamber and showed how vanes could be created in the exhaust for steering. He also illustrated the crew lying on their backs in a pressurized cabin in order to withstand the pressure of such high speeds. Tsiolkovsky also thought of rocket staging. Rocket staging is a series of rockets that fire one after the other. When one finishes and the other fires, the useless rocket is jettisoned. He thought this was the only way to put heavy objects such as satellites into space. GoddardAlthough Tsiolkovsky thought up the ideas of advanced rocketry, still more had to be considered, and it had to become reality. The next pioneer, was the father of American rocketry, Robert Goddard. He first, created a bazooka type rocket. The bazooka was fairly large solid-propellant rocket. In 1919, he wrote a text called A Method of Reaching Extreme Altitudes. Two years later, he bagan to experiment with the liquid fuels that Tsiolkovsky. In 1926, Goddard finally launched the first liquid propelled rocket. It was fueled by gasoline and liquid oxygen. It rose to a height of 41 feet and traveled at 60 miles per hour. It only traveled 56 meters but it set the foundation for the future of rocketry. In May 1935, he released a rocket that featured gyro controlled exhaust vanes which pushed it to travel 1.5 miles above the ground at a totally unprecedented 700 miles per hour. GERMAN ROCKET SCIENTISTSIn 1923 a German rocket scientist Hermann Oberth published The Rocket Into Planetary Space. He favored liquid propellants, as Goddard, because of their power. His experimentation inspired the creation of the Society for Space Travel. The society passionately experimented with ways to improve the liquid propellant rocket. On February 21, 1931, a member of The Society for Space Travel, Johannes Winkler, launched the second liquid fuel rocket. Winklers rocket was propelled by liquid methane and liquid oxygen. It failed totally, going a mere ten feet forward. Three weeks later another rocket ascended to about 2000 feet. The entire Society for Space Travel began working on two rocket series, the Mirak and Repulsor. The late model Repulsors could reach an altitude of 1 mile. When The Society for Space Travel ran out of money, they made a demonstration of the Repulsor for the German Army. A member, Werner Von Braun compiled some statistics for the army who gave it to Hitler. They realized that this did not violate the treaty which did not allow them to build airplanes. Hitler started the Army Weapons Department. Von Braun was placed in charge of rocket development. Within a few years Von Braun was experimenting with highly developed rockets and was firing them in secret at the island of Birkum. In 1934 he created two rockets, that could ascend to over 1.5 miles. After that, The Society for Space Travel fell apart due to financial problems. In 1937, a rocket research station was constructed on the Baltic coast. Here the Germans created such rockets as the famous V-1 Buzz Bombs, and the mammoth V-2 which were really rocket-powered flying bombs. ConclusionIn this research, it has been demonstrated how all rocket engines work. It illustrates how propellants a re moved into a combustion chamber, and expelled at extremely high speeds. It shows the properties of efficiency, the basic measure by which all rockets are compared. It shows how efficiency is measure by specific impulse, which is calculated by the propellants exhaust velocity divided by g. It has given a basic comparison as to the efficiency of various rockets and has shown the reasons for being at their respective ranks. Also shown, is the pioneering of rocketry starting in the mid 1200s. All this has shown the basic properties of space propulsionBibliographyhttp://www.asi.org/adb/04/03/09/01/ the Rocket Engine Specifications page from the Artemis Project(http://www.asi.org/ ) Data Bookhttp://www.orbireport.com/Data.html-the Orbital Report News Agencys Launch Vehicle databasehttp://leonardo.jpl.nasa.gov/msl/home.html JPLs Mission ; Spacecraft Libraryhttp://solar.rtd.utk.edu/%7Emwade/spaceflt.htm Mark Wades Encyclopedia Astronauticahttp://www.ksc.nasa.gov/shuttle/technology/sts-ne wsref/stsref-toc.html The Space Shuttle Reference Manualhttp://nmp.jpl.nasa.gov/ds1/tech/sep.html Solar electric propulsion on the Deep Space 1 probe?Rockets? Sutton, George P Groliers Online EncyclopediaEngineering

Zoroaster Outline Essays

Zoroaster Outline Essays Zoroaster Outline Essay Zoroaster Outline Essay Essay Topic: The Satanic Verses Zoroastrianism l. Zoroastrianism is a monotheistic religion that was once widespread in the Near East and Middle East. (Molloy 438) A. It spread widely, but is now mostly present in India. (Molloy 438) B. Some see possible influence on the development of Essenes, early Christianity, and Islam. (Molloy 438) II. The prophet Zoroaster, the founder of the religion, was born about 650 BCE in what is now Iran. (Molloy 438) A. He was surrounded by the worship of nature gods, common to his area of upbringing. (Molloy 438) i. He did not believe in his religions practices of the sacrifice of animals at the fire ltars and the power of the priests. (Molloy 438) B. At age 30, Zoroaster experienced a vision which completely changed his life. (Molloy 438) i. He felt himself transported to heaven by a spirit he called Vohu Manah (good mind) into the presence of the High God Ahura Mazda (wise lord). (Molloy 438) C. Zoroasters new message was initially met with strong rejection, which he blamed on demons (daevas) and the satanic head of evil forces, Angra Mainyu (wicked spirit). (Molloy 438) i. His bitter experiences made him have further belief in good vs. evil. Molloy 438) D. Eventually Zoroasters teachings reached an Iranian King named Vishtaspa, and he used his power to spread Zoroasters new religion. (Molloy 438) Ill. Zoroastrianism has one sacred religious text, called The Avesta. (Boyce 238) A. It is supposed to be written by Zoroaster himself, and includes the seventeen Gathas (hymns), Yasna Haptanhaiti (Worship of the Seven Chapters, a short liturgy accompanying the daily act of priestly worship), and two very holy manthras. (Boyce 238) B. The entirety of The Avesta was written down in Iran, under the Sasanian ynasty, and was then a massive compilation in twenty-one books. (Boyce 238) C. Only a few copies were made, and in the destruction which later attended the Arab, Turkish, and Mongol conquests of Iran all were destroyed. (Boyce 238) D. The surviving Avesta consists of liturgies, hymns, and prayers. (Boyce 238) V. Zoroastrianism revolves around the war between good and evil, which are always present. (Hinnells 81) A. Zoroaster taught that God was the sole Good Creator of all things, of sun, moon and stars, of the spiritual and material worlds, of man and beast. Hinnells 81) B. He (Ahura Mazda) is in no way responsible for evil in the world; this comes from the Destructive Spirit (Angra Mainyu) whose nature is violent and destructive. (Hinnells) C. The world is a battleground in which the forces of good and evil do battle. (Hinnells) D. The spirit of light and good in the world is known as Spenta Mainyu (holy spirit ). (Molloy 438) V. Zoroastrianism has belief of divine Judgement and in an afterlife of reward or punishment, which begins at death. (Molloy 438) A. During life, humans are involved in a cosmic struggle between good and evil. Molloy 438) a) These good actions may consist of: telling the truth, dealing honestly with others, cultivating farmland, and treating animals kindly. (Molloy 438) B. Final Judgement begins at death when an individuals soul must cross a bridge that can lead to paradise. (Molloy 438) i. If the individual has been good, the bridge is wide and the Journey to paradise is easy; but if the individual has been evil, the bridge becomes so narrow that the soul falls deep into the depths of hell. (Molloy 438) C. There is also a belief in the end of all times. (Molloy 438) i. When the world comes to an end, there will be a resurrection of all bodies and a great general Judgement; at this time the world will be purified by fire, which will punish the evil but leave the good untouched. (Molloy 438) VI. Zoroastrianism has long been a highly ritualistic religion. (Molloy 438) A. A Zoroastrian has the duty to pray five times daily (at sunrise, noon, sunset, midnight, and dawn) in the presence of fire, the symbol of righteousness. (Boyce 247) i. He prays standing, and while uttering the appointed prayers (which include verses from he Gathas) unties and reties the kutsi. Boyce 247) a) The kutsi is a sacred cord, which should be worn constantly. (Boyce 247) B. Ceremonies at death are considered very important and have a double aim: to isolate the impurity of the dead body and give help to the soul. (Boyce 249) i. The body is wrapped into a cotton shroud and carried on an iron bier, and after due prayers by priests, to a stone tower (dakhma), where the polluting f lesh is quickly eaten by vultures and the bones are bleached by sun and wind. (Boyce 249) it. Mourners ollow the bier at a distance, two by two, and afterwards make ablutions. Boyce 249) Molloy, Michael. Zoroastrianism. Experiencing the Worlds Religions: Tradition, Challenge, and Change/ Michael Molloy. 6th ed. New York: McGraw-Hill Companies, 2013. 438-439. Print. Boyce, Mary. Zoroastrianism. The Penguin Handbook of the Worlds Living Religions/ Ed. John R. Hinnells. Strand: Penguin Group, 2010. 238-249. Print Hinnells, John. The Cosmic Battle: Zoroastrianism. Eerdmans Handbook to the Worlds Religions/ Ed. R. Pierce Beaver. Herts: Lion Publishing, 1982. 80-87. Print.