If you are interest in space, no wonder you are familiar with SpaceX. So space x is building this rocket with the intention of reducing the cost of space travel. Started in 2002, SpaceX aims to build a reusable rocket. After trying for several years they finally created this Falcon 9 rocket as a reusable rocket. In the early days, many people said this was impossible. But Elon Musk and his company have finally proven it’s possible. They later became the first company in the world to successfully build a reusable rocket. Eventually, they were able to safely take people to the international space station. So SpaceX is a company that provides a valuable service for extraterrestrial activities.
The Falcon 1 was the first orbital rocket to be tested by SpaceX. They designed this rocket for low-cost space missions. SpaceX was the first private company to develop a liquid-fuel rocket. The first flight of this rocket took place on March 24, 2006. It costs about $ 7 million to fly once. But this rocket is not currently in use. It uses RP-1 and LOX as fuel. (Rocket Propellant 1 & liquid oxygen) SpaceX now uses the Falcon 9 rocket it is a reusable rocket.
As mentioned above, the Falcon 9 was the world’s first rocket to land successfully after use. So this rocket has two stages. The first stage is the Falcon 9 booster. This booster is powered by nine main engines. It uses nine Merlin engines designed by SpaceX. A merlin engine is also using for the second stage. These engines are upgraded to operate in a vacuum also known as space. In the first stage, nine engines are using to lift the second stage and payload out of gravity into space. And the most expensive part here is the first stage.
The second stage, after passing the atmosphere, does not require much force to move. For that reason, only one engine is using for the second stage. This Falcon 9 booster launches the second stage into space and returns to earth and land on the landing pad. Sometimes this lands on a drone ship. The reason is that there is not enough fuel to return to land.
Falcon 9 Launch and landing
The Falcon 9 rocket performs a static fire test prior to launch. Here all the engine of the rocket ignites for a few seconds. This is done to measure the pressure, temperature, and propellant-flow gradients in the engine. The data collected from this will determine whether or not to launch the rocket. This decision is often made by the rocket launch software. So after these tests, the Falcon 9 rocket is usually go for launch.
After the countdown, the rocket’s nine Merlin engines ignite and the rocket slowly ascends. Thus shortly after the rocket took off You may have seen it moving in one direction. This is done to get the momentum needed to launch the rocket into orbit. Normally, as a rocket rises, the pressure exerted on the rocket by the atmosphere increases. Then the rocket passes MAXQ at an altitude of about 11 km. MAXQ refers to the part of the atmosphere that has the highest pressure. In some cases, the rocket may explode during the MAXQ. That’s why the people in the control room cheer when the rocket passes the MAXQ.
The rocket takes off and at an altitude of about 70 km turns off the main engine and separates the first stage. Then in the second stage, the engine is turning on and it moves forward. The first stage is then reversed using its cold air thrusters. These cold air trusters can gently control the rocket. At the same time, the engine of the rocket is turning on again and then perform a boost backburn. This is for slow down the vehicle and moves back to the landing pad. while re-entry into the atmosphere, the engine is lit and perform an entry burn. This is to prevent the rocket from being destroying by atmospheric friction. Once in the atmosphere, its grid fins and cold air thrusters straighten the path and move it towards the landing pad.
So at the moment, the rocket has very little amount of fuel. Therefore, they should use it very carefully for landing. In the meantime, the engine re-ignites as the landing legs expand. As a result, the rocket slows down and approaches the ground slowly. So in order to land this successfully, the velocity should be 0 as soon as the landing legs are on the ground. If this process does not take place properly, the rocket will explode. So now you understand that re-landing a rocket is a very difficult task. However, most of their rocket landings have been successful.
Also read about Starship Here