Showing posts with label transportation. Show all posts
Showing posts with label transportation. Show all posts

Friday, February 16, 2018

The Golden Age of Aviation

        I enjoy flying and am always fascinated about how a journey from the east to west coast of the United States that originally took about six months now takes less than six hours. But what caused this dramatic shift of travel time? What made an expedition that tests bravery, endurance, and health a matter of casual relaxation?
The Douglas DC-3 had the industry at a stalemate.
The Lockheed Constellation, another American offering.
     
        To be honest, it wasn't a very fast transition. Although people immediately saw commercial potential in what literally started in a barn at Kittyhawk, passenger aviation didn't take off until the 30s, and when World War II emerged, the entire industry was grounded as the focus shifted to building fighters and military transports. However, during the post war era, a golden age for passenger aviation began, and the industry reemerged. The number of passengers increased, and airlines started to thrive. But, the most impressive advancement was in the field of manufacturing planes themselves. The United States left the second world war with more experience designing and building cargo planes. They were able to modify their designs to allow for passenger transport, and by doing so cornered the industry. In fact, around this time, about 90% of the world's air travelers were flying aboard American-built Douglas DC-3s. Other countries– Britain for example– had been focusing on bombers and other aircraft not suited for carrying commercial payload during WWII, and therefore had to rebuild their industry. But in order to gain the spotlight, they had to do something incredible. Alas, the Comet was born.

        The accepted reasoning of aircraft propulsion was that jet engines did not produce enough thrust relative to the amount of fuel they consumed. But that reality was starting to slide, as piston engines were becoming larger and being loaded with superchargers to squeeze out what more thrust they could produce, and with these new efforts, their efficiency was starting to diminish. So the De Havilland company of Britain was given the task of creating the first commercial jetliner. During the design process, they used decoy designs to give the public the wrong idea, so when the final design of the Comet was revealed, the world was shocked. Even today, I consider its design to be awesome. Its sleek wings, elegant look and beautiful aerodynamics were straight out of the future. Its four ghost jet engines were integrated into the wing, making it look even more stunning. With this aircraft looking modern even today, you can imagine the impression it had on the public back then. Not only was it good-looking, but it was also more advanced. Instead of flying at the conventional altitude of 10,000 feet, it would cruise at 40,000 feet, where the air was thinner and weather was less problematic. But, to do so, it had to have a highly pressurized cabin, and while other planes had these kinds of cabins, no other flew so high.
A Comet 1, one of the original types.
     
        The Comet made its maiden flight on January 9th of 1951, and immediately started receiving orders from airlines all over the world. It cut travel times in half, and became renowned for its pristine service and passenger comfort. To fly on this plane was considered a luxury mostly done by upper middle class and wealthier individuals. This is one of the reasons I envy the travelers that flew on this plane.
     
        De Havilland was enjoying their new-found superiority in the industry, and produced several early models of the Comet. But within a year, things started to go wrong. Most travelers didn't question the safety of this plane, and when two Comets overshot the runway in 1952 and 1953, the pilots were blamed. However, De Havilland later corrected a wing fault that resulted in loss of lift. Not long after though, another Comet disintegrated in a thunderstorm just after takeoff from Calcutta, and in 1954, another accident occurred, this one far worse. While flying in perfect conditions near Rome, a Comet exploded during its climb. After these incidents, BOAC, the company operating the planes from Calcutta and Rome, grounded their fleet of Comets while an investigation occurred. but after no conclusions were drawn, BOAC resumed their operations as planned ten weeks after the incident. But, only two weeks later, another Comet suffered the same fate outside of Rome. With this, public confidence in the Comet shattered, and its Airworthiness Awards were revoked. De Havilland had no choice but to stop all operations of their once famed fleet. for months, an investigation was conducted, and the cause of the accident was revealed to be fatigue in the fuselage caused by pressurization and amplified by the square windows on the plane.
     
        Unfortunately, this was the end of De Havilland's superiority. While they rushed to correct the faults in their plane, other companies were catching on. The same year that the Comet 4 was released, Boeing released their 707 and Douglas began their jet era with their DC-8. Then came Tupolev's 104 and Ilyushin's IL-62. These larger, and less expensive options offered a further flight range, and therefore were easily able to compete with the original jetliner. The Comet 4 had just 76 deliveries to airlines, a fraction compared to over 500 DC-8s and more than 1,000 Boeing 707s.
Douglas DC-8 (556 Deliveries)
Boeing 707 (1010 Deliveries)

        Although it had its troubles, this plane's mistakes paved the way for the future of the industry. Boeing even admitted that they would have made the same mistakes if it weren't for the Comet. This aircraft may seem normal, but without it, transcontinental flight might still be a dream. The technological marvel of the Comet still inspires me and makes me wonder how humans can achieve such things. Sometimes, I wonder what the future will look like, and with that, transportation. What will the next generation of aerospace look like? Let's just say, "We're not there yet."

Wednesday, January 27, 2016

From Horse Power to Horsepower


In the 19th century, transportation was a problem. Horse pollution was like the modern pollution we face with cars. Yet everyone relied on equines for their basic needs and for transportation. Living standards skyrocketed from 1800 to 1900. US per capita GDP rose from $1,100 to $4,600 (in 2000 dollars). This meant greater trade, and virtually all goods were, at some point in their journey, transported by horse. In ten major US cities, the number of teamsters rose by a whopping 328 percent between 1870 and 1900, while the human population as a whole rose only 105 percent. So everyone relied on horses, but the pollution was becoming unbearable.
One aspect of horse pollution that contributed to the growing need for a new system was manure. Experts from that time estimated that each horse produced between fifteen and thirty pounds of manure per day. New York and Brooklyn had a combined horse population of between 150,000 and 175,000 horses in 1880. Between three and four million pounds of manure were deposited on city streets and in city stables every day. Each horse also produced about a quart of urine daily, which added up to around 40,000 gallons per day for New York and Brooklyn. Vacant lots across the US were piled high with manure. In New York these sometimes rose to forty and even sixty feet.
Flies were another problem that came with horses. Manure is a favorite breeding ground for flies. It is estimated that three billion flies hatched in horse manure per day in US cities in the year 1900. Flies spread disease and filth. Studies have shown that outbreaks of deadly infectious diseases like typhoid and infant diarrheal diseases in the nineteenth century can be attributed to growth in the fly population.
Horses also are prey animals. Busy city streets provided many opportunities for horses to spook and scare at things. Stampedes and scared horses killed a substantial amount of people. Horse-drawn vehicles were far more fatal than their modern counterparts. In New York in 1900, 200 people were killed by horse-drawn vehicles and horses. This contrasts with 344 automobile deaths in New York in 2003. The fatality rate per capita in the horse era was roughly 75 percent higher than today. Data from Chicago shows that in 1916 there were 16 horse-related fatalities for each 10,000 horse-drawn vehicles; this is nearly seven times the city’s fatality rate per car in 1997.
So horses posed a big problem for the cities of that time. The invention or the automobile could have been said to save the people from the horrible pollution that was crowding the streets of cities. The car was actually not something that caught on very quickly. Like the electric car of today, people thought that horseless carriages were fad, and would pass with time. People would say “get a horse!’ and cartoons depicting people jumping out or the way of horseless carriages started appearing. Maybe we just need another solution like the car to help us overcome our modern day global warming and car smog problems. Our growing world needs growing ideas, so maybe the world’s next big solution could be right around the corner.


Sources:
"From Horses to Horsepower: A Rocky Transition." MNN. N.p., n.d. Web. 21 Jan. 2016.
"Introduction: The Ostrich And The Eagle." America at the Dawn of a Global Age Promise and Peril (n.d.): 1-21. Web.

Morris, By Eric. "From Horse Power to Horsepower." From Horse Power to Horsepower (n.d.): n. pag. Web.

Table of contents

Wednesday, February 18, 2015

From Horses To Cars



From Horses To Cars
I'm sure you have ridden in a Car before or definitely seen a car? Why did we change from horses to cars, planes, boats etc? When did we change? Transportation helped a civilization thrive and succeed.
Horses were used in up to the 18 century  to get to a destination from another destination

Tuesday, February 12, 2013

The Steam Engine

The Steam Engine
Will Harmon

The steam engine was a very important invention. The steam engine powered many things that were important to the people at that time, such as the train, the mill, and the boat. The steam engine came before the combustion engine, which used the some of the same basic principles. The steam powered idea is actually still used in nuclear power plants today. The steam engine was an invention important to the evolution of engines.

Some people recognize inventions by how they looked and what they did, not what they were made of. The train, a very significant invention, is an invention most people look upon as one of the greatest inventions of its time. What most people don't realize, however, is that the train is powered by the steam engine, which is definitely an invention that greatly surpasses the train in importance. The steam engine used in the train and the boat helped people travel much easier and much faster. Without the steam engine, none of these inventions would have ever been invented.

The steam engine was an advanced piece of machinery at its time. It consisted of two main parts: the steam-making device (the boiler) and the machinery. The boiler works by heating up the water so it turns into pressurized steam. The machinery is usually a piston or a turbine that uses the pressure of the steam to turn a shaft. Then, the turning motion of the shaft powers whatever it is connected to.
Here is a very simple diagram of how a steam engine in a train works.

Before the useful version(s) of the steam engine, various people had done experiments with the idea of steam powering something. One of these was the aeophile, a device described by the Greek mathematician Hero of Alexandria, which used a ball filled with steam where the steam shot out of angled tubes, rotating the ball. One of the first commercial steam engines was the water pump, first used in the late 1600's. The main era of the steam engine, however, was between the 1800's and the 1900's, when they were mostly used in trains and boats. The steam engine had many important uses back then and even now, when efficient high-tech nuclear-heated engines are in use.
A more complex diagram of how a nuclear reactor uses steam power today.

The steam engine changed how the world got around, used energy, and used resources. It was one giant step toward the way we are today. The steam engine sped up travel extremely fast, and it was a major convenience in many ways. Variations of the steam engine are even still in use today. Without the invention of the steam engine, the world would not be how it is today.




Works Cited
"External Combustion Engines." External Combustion Engine Lesson & Worksheet. N.p., n.d. Web. 12 Feb. 2013. <http://www.myschoolhouse.com/courses/O/1/142.asp>.
Gore, Albert. Our Choice: A Plan to Solve the Climate Crisis. Emmaus, PA: Rodale, 2009. Print.
"How Nuclear Power Works." HowStuffWorks. N.p., n.d. Web. 12 Feb. 2013. <http://science.howstuffworks.com/nuclear-power2.htm>.
"Steam Engine." Wikipedia. Wikimedia Foundation, 02 Oct. 2013. Web. 12 Feb. 2013. <http://en.wikipedia.org/wiki/Steam_engine>.