Tag: tesla

The success story of Space X – from Falcon 1 to Starship

The Falcon super heavy launch vehicle was designed to transport people, spaceships, and various cargos into space. Such a powerful unit wasn’t created instantly and it also had its predecessors. The history of the Falcon family of vehicles began with the creation of the Falcon 1- a lightweight launch vehicle with a length of 21.3 meters and a diameter of 1.7 meters and a launch mass of 27.6 tones; the rocket could carry 420 kilograms or 926 pounds of payload on board. It became the first private device that was able to bring cargo into low earth orbit. Construction of the Falcon 1 of only two stages, the first of them consisted of a supporting element with fuel tanks, an engine and a parachute system. They chose kerosene as the fuel and liquid oxygen became its oxidizing agent.

The second stage also contains fuel tanks and an engine; though the latter had less thrust compared to the one in the first stage despite the huge launch cost $7.9 million. Totally five attempts were made to send the Falcon 1 beyond the of our planet nut not all of them were successful. During the debut launch of the rocket, a fire started in the first stage engine; this led to a loss of pressure which caused the engine to shut down in the 34th second of flight. The second attempt to start the Falcon 1 incurred a problem with the fuel system of the second stage fuels stopped flowing into its engine at 474 second of flight it shut down as well. The third time of the Falcon 1 went on a flight, it wasn’t alone of the serious cargo the rocket carried onboard the trailblazer satellites and to NASA microsatellites. In phase one with the first stage he flight went normally but when the time came to separate the stages, the first hit the second when it started engine, so the second stage couldn’t continue its flight.

 The fourth and fifth launches shoed good results but that wasn’t enough. The main problem with Falcon 1 was low demand due to its low payload abilities. For this reason, they designed Falcon 9; this device can carry on onboard 23 tons of cargo. It’s also a two stage launch vehicle and uses kerosene and l liquid oxygen as fuel. The device is currently in operation and the cost of its launch is equal to $62 million. The first stage of the rocket is reusable; it can return to earth and can be used again. The Falcon 9 is designed to not only launch commercial communication satieties but also to deliver dragon 1 to the ISS. Dragon 1 can carry a six ton payload from the earth, this drone supplies the ISS with everything they needs and it also takes goods back.

The dragon 2 is designed to deliver a crew of four people to the ISS and back to earth. Now there is an ultra heavy launch vehicle with a payload capacity of almost 64 tones. It is the most powerful and heavier device called the Falcon heavy. This rocket was first launched on February 6th 2018 and the test was successful. The rocket sent Elon Musk’s car into space- a red Tesla Roadster. After this debut subsequent launches were also conducted without problem. The launch cost is estimated to $150 million.

The first stage of the Falcon heavy consists f three parts. There are three blocks contain 27 incredibly powerful engines in nine each one. The thrust created when takeoff is comparable to 18 Boeing 747s at full power. The second stage is equipped with a single engine. It is planned that the device would be used for missions to the moon and mars. Currently, SpaceX working on the starship manned spacecraft.  According to its creators, this device will be much larger and heavier than all of the company’s existing rockets. This device will able to deliver cargo into space weighing more than a hundred tons. The launch of starship into pace is planned for 2022 to mars with a payload. Who knows, one of the mankind’s largest dreams may come true within the next year.

Nikola Tesla’s Inventions – Working of AC current

“I don’t care that they stole my idea, I care that they don’t have any of their own”, said by one of the greatest inventors to have ever lived, the Serbian inventor Nikola Tesla who developed the framework for modern-day electrical engineering. When Nikola Tesla began work at Edison’s DC (direct current) power plant in the United States, his new employer was not interested in his ideas for a new type of power called AC (alternating current). At the time DC was the only electrical supply, but it could only be transmitted across short distances before it lost power. To Edison, AC sounded like competition and he persuaded Tesla to work on improving his DC system by offering him a huge sum of money. But when Tesla had done what he had been asked, Edison reneged on his promise. Tesla resigned and returned to his AC power concepts. DC power is constant and moves in one direction and the resistance in wires causes it to lose power over distance. AC power does not have this problem as it varies in current so the resistance is less, and yet it varies in current so the resistance is less, and yet it delivers the same amount of power.

How AC current works?

In an atom, the negatively charged electrons are bound to the nucleus due to their electromagnetic attraction to the oppositely charged nucleus. But the electrons in the outer most shell called valence shell can sometimes become free due to external forces. These electrons that escape from the valence shell are called free electrons and they can move from one atom to another. This movement is called charge and the flow of electric charge is called electricity. Materials that allows many electrons to move freely are conductors and don’t allow are called insulators. That why copper is a great conductor. Alternating current would flow back and forth 50-60 times per second, this is called the frequency. Even though Thomas Edison one of the famous and powerful men of the 19th century, he tried his best to compete with Tesla. The mathematic formula of the current is P = I×V, with this formula, the same amount of power can be transmitted either at high current and low voltage or low current and high voltage. But when you transmit current through wires, there will be also loss of heat. To overcome this problem, we have to higher the voltage to reduce the heat loss.

In modern electric power grids, electricity is transmitted at hundreds of thousands of volts. But the voltage cannot be this high when it arrives at your home. So a transformer steps down this high voltage to typically between 100 and 240 volts. The step down process of AC current is way easier than the DC current. Transformers require a time varying voltage to function, and since direct current is constant, and only alternating current is time varying, transformers like these only work with AC electricity. In Edison and Tesla’s time, there was no easy way to transform voltage with direct current. And this is the primary reason Tesla’s AC won out over Edison’s DC in the early era of electrical transmission.

AC current – a scientific breakthrough

This made AC power more cost effective, as fewer power plants were needed. Entrepreneur George Westinghouse saw the potential of Tesla’s AC power and bought his patents for AC motors. Edison began a propaganda war in an attempt to keep DC power on top, but it was inevitable that ac power would win. Almost all electricity is now delivered as Tesla’s AC power. Edison’s place in history as an inventor and electrician is secure. But in many ways Tesla went even further. He envisioned fluorescent lights, technology of the radio, and remote control. Nikola Tesla was one of the most forward thinking, and dynamic visionaries that ever lived.

“If your hate could be turned into electricity, it would light up the whole world”. – Nikola Tesla