The Aerospike :: physics aerospike rocket engine

When a rocket's fuel ignites, the molecules in the fuel release a tremendous amount of energy in the forms of heat, light, and sound. They expand rapidly as they move from the "throat" of the nozzle into the "bell." The compressed air inside the balloon wants to expand outward. Therefore it presses against the walls of the balloon in every direction except the place where there is no wall - the "nozzle" of the balloon. Because there is no force vector in this location, adding the vectors yields a net force to the right. A bell nozzle, where a fuel (liquid Hydrogen) mixes with an oxidizer (liquid Oxygen) at a rate "m." As they ignite they are forced into the throat, where they are compressed substantially. As they move out into the bell, they steadily expand, pushing against the nozzle and creating a net upward thrust, similar to the compressed air pushing on the walls of the balloon. Luckily, a rocket can be controlled more than a released balloon. Nozzles do not have to be bell shaped - as long as gas is expanding and pushing against a surface, creating thrust, any shape can be used! One alternative to the bell engine is the spike configuration. In particular, the Aerospike engine will be described and analyzed. The "Spike," or annular, engine is one of three basic engine designs: cones, bells, and annulars.The Cone is the simplest engine design. A cone with a narrow angle provides the greatest thrust, but a longer engine means increased weight. A short, wide-angle cone tends to be unstable under pressure (in the atmosphere). For example, the Apollo Saturn 5 featured long, relatively thin nozzles for optimum thrust at sea level. The Command Module, which operated only in space, utilized a comparatively wider engine for more expansion in space. The Bell nozzle is a compromise, opening up more rapidly near the throat and then opening more slowly near the end. However, bell nozzles are optimized for specific altitudes, therefore they will only provide their maximum thrust at a given altitude - at all other points they will provide less-than-optimum thrust. The annular, or "altitude compensating" engine is a more recently developed design. Commonly referred to as Spike engines, annulars operate with exhaust flow outside what is typically thought of as the nozzle. The exhaust flows around a central spike, rather than being contained by walls. They are called "annular" because the throat is donut-shaped, with the spike protruding from the middle.

My Motivational Touchstone Essay

I once spoke to a very well educated man whom I had never met before, have only spoken to him on the phone and found that he gave me some compelling thoughts that would change my life forever, He gave me courage and conviction that hopefully will make me whole again as a person. I am coming to the conclusion that I am writing a letter to myself and will be my personal motivational journal and success within myself. I could write for hours, days and weeks and tell a never ending story; however I must begin somewhere and end somewhere. My life of failure and true disappointments has been what I would call an educational disaster. I believe in the foundations of education, the roots of learning which stems from the roots of your soul and the passion in which you strive for. I pray for success and courage that I will make it. I want to do my best and like Florence Chadwick when she swam in the mighty ocean, she never saw the bottom, she only saw the shore line and sometimes that was even difficult, but with motivation, determination and most of all strength, she braved the darkest hours as well as the shining moments. Her arms and legs may have given out, but it certainly was her heart that did not quit. I will be brave in my mind, for I do not want my mental diseases to take over my heart and make me a quitter again. I have PTSD, and I have come up with an anagram for the 4 letters, Positive Thinking Shall Develop. This will be one of my motivation words that I will put by my mirror to make me smile and strive for that tassel of hope. I feel these two quotes represent my personality, the standards in which I live by and most of all, that I feel is motivation for me because it inspired me for two reasons, number one is education. I will find solace in knowing I have found my calling in health psychology with a concentration in PTSD and emotional, mental as well a physical abuse. (This happened to me). We cannot live better than in seeking to become better. † ? Socrates The roots of education are bitter, but the fruit is sweet. Aristotle The above quotes will forever be my shore line and the sand will never be rocky, only perfect with beautiful sea shells.

Steinhouse Knitting Mills - 1083 Words

Primary problem: Sine 1988 , sales had been declining steadily. Evidence: 1988 sales-$ 7.5million; 1993-$3.5 million; 1998-$2.7million. Situation Analysis A Environment 1.Low-wage developing countries with an abundant supply of labour provide tough competition to Canada. 2Growing popularity of the ‘ big and tall size’. 3 Trend to ‘dressing down’ or ‘ casual days’ 4 The weather over last few years has hurt business.( Winters were warm) 5 Fashion business usually changes fast. 6 The low value of Canadian dollar relative to the U.S dollar. Summary of environmental opportunities and threats: Opportunities: a Serving ‘big and tall size ‘customer groups and market segments; b. Low value of CDN dollar means lower price for American,†¦show more content†¦B Make bigger push into the USA market Use the strengths of duty free, low exchange rate of CDN dollar and convenient transportation, make a bigger push into the USA. Produce a lot more ‘ Big and Tall’ size and focus on the European style which is different from USA local market. C Make a bigger step into sport-shirt manufacturing business Continue supplying traditional main products, but open a eye on potential new business partners, Based on the JMD success experiences , find out chance to enter Man`s sport T shirt manufacturing business markets. Implementations: 1 Get rid of 10 old machines and buy 10 new modern one;10 old one continue to manufacture the inventory of acrylic/wool sweaters and increase ‘Big and tall’ size;10 new ones would used to produce high-gauge sweaters and mixed cashmere sweaters. 2 Hire several in-house designers to design new styles according to different segments customers` demands; 3 Import some sweaters from low-wage countries labels the brand name Etcetera which target downmarket. 4 Import cashmere from china if the cost lower then $75($50*1.5)/ per sweater. 5 Reset the price for different brands. 6 Use multiple marketingShow MoreRelatedCase Study Steinhouse Knitting Mills (Canada)1608 Words   |  7 PagesLegal: The Apparel industry in general and particularly the Sweater industry is facing problems of declining sales and increased overheads. Steinhouse operates in the higher price band and this sector is dominated by named brands such as Polo and others and departmental stores and the customers prefer such brands over the lesser-known brands such as Steinhouse. Large retailers such as Walmart, prefer to buy directly in bulk from low wage countries such as Bangladesh, China and others. The US market