V-2 rocket

A long time ago, people built a large rocket.

It used liquid fuel to fly. This fuel helped it go very fast. The rocket was used in a war. This was a sad time for many people.

The rocket flew high into the sky. It went past the edge of space. This was the first man-made object to reach space. Many people later used this idea to fly to the stars.

The V-2 rocket was a very important machine. It was the first modern ballistic missile. A ballistic missile is a rocket that follows a set path through the air.

Scientists in Germany built the V-2 during World War II. Wernher von Braun led much of the work. The rocket used a liquid-propellant engine to fly. This means it used liquid fuel and liquid oxygen.

A special pump pushed the fuel into a chamber. Inside the chamber, the fuel burned to make power. This power pushed the rocket up the sky. The rocket moved faster than the speed of sound.

On June 20, 1944, a V-2 reached a very high altitude. This height was 100 kilometers. Scientists call this the edge of space. This made the V-2 the first man-made object to travel into space.

The war was a hard time. Many people died during the attacks. Many others died while making the rockets in factories. After the war, many countries studied the V-2. They used its parts to help build new rockets for space flight.

The V-2 rocket was a very important machine. It was the world's first modern ballistic missile. A ballistic missile is a rocket that follows a set path through the air.

During the Second World War, Nazi Germany built these rockets. They called them "vengeance weapons." They used them to attack cities like London, Antwerp, and Liège. The rockets moved at supersonic speeds. This means they flew faster than the speed of sound. Because they were so fast, they hit their targets without any sound to warn people.

How did the rocket work? It used a liquid-propellant rocket engine to fly. The rocket carried a mixture of 75% ethanol and 25% water as fuel. It also carried liquid oxygen as an oxidizer.

A special part called a turbopump moved these liquids. This pump spun at 4,000 rpm to push the liquids into a combustion chamber. Inside the chamber, the liquids ignited. This created a huge amount of power. The engine produced 25 tons of thrust to lift the 13.5 ton rocket. The water in the fuel helped keep the engine cool.

Many people worked to make the V-2 possible. A scientist named Wernher von Braun led the work. He was interested in rockets since he was a teenager. He even built a homemade toy rocket car once. Later, he worked at the Peenemünde Army Research Center. Other scientists like Walter Dornberger and Walter Riedel also helped. They used ideas from an American named Robert H. Goddard. The rockets were guided by a computer and special spinning tools called gyros. These tools helped the rocket stay on its path.

Building these rockets had a very high cost. The rockets were made at a site called Mittelwerk. Many people died while making them. About 12,000 laborers and prisoners died during production.

When the rockets were used in attacks, about 9,000 people died. In June 1944, one rocket reached 100 kilometers high. This is the height scientists use to mark the edge of space. This made the V-2 the first man-made object to travel into space.

After the war ended, the V-2 changed the world of science. Many countries wanted to learn how it worked. The United States, United Kingdom, France, and the Soviet Union all studied the technology. Through a program called Operation Paperclip, teams captured the rocket parts. This technology helped people build better missiles later. It also helped humans learn how to fly into space. The V-2 was a difficult and sad invention, but it led to the space age.

The V-2 rocket, originally named Aggregat-4 (A4), was the world's first practical, modern ballistic missile. A ballistic missile is a rocket that follows a predetermined path, much like a thrown ball.

Developed by Nazi Germany during the Second World War, it was intended as a "vengeance weapon." The German military used these rockets to attack Allied cities, including London, Antwerp, and Liège. Because the rockets traveled at supersonic speeds, they moved faster than the speed of sound. This meant they impacted their targets without any audible warning.

The propulsion system of the A4 relied on a complex liquid-propellant rocket engine. The rocket used a mixture of 75% ethanol and 25% water, known as B-Stoff, as its fuel. To allow the fuel to burn in space, it also carried liquid oxygen (LOX), called A-Stoff, as an oxidizer.

A critical component was the turbopump, which rotated at 4,000 rpm. This pump was driven by a steam turbine powered by the decomposition of concentrated hydrogen peroxide. The turbopump forced the fuel and oxygen into the combustion chamber at a rate of 125 liters per second. During the initial stage, the engine produced 8 tons of thrust. As the turbopump pressurized the fuel, thrust increased to 25 tons to lift the 13.5 ton rocket.

Engineers used several specific methods to keep the engine from melting during flight. One method was regenerative cooling, where the fuel helped manage heat. They also used film cooling, which admitted alcohol through four rings of small perforations under slight pressure. This created a protective layer within the combustion chamber and exhaust nozzle. The water in the fuel mixture also played a vital role. It reduced the flame temperature and acted as a coolant by turning into steam. This helped reduce thermal stress on the engine parts.

To stay on course, the V-2 used a sophisticated guidance system. It featured four external rudders on the tail fins and four internal graphite vanes located in the jet stream.

These eight surfaces were controlled by an analog computer called the Siemens Vertikant LEV-3. This computer received electrical signals from gyroscopes, which are spinning tools used for stabilization. The system included two free gyroscopes to manage pitch and yaw. It also used a PIGA accelerometer to control the exact moment of engine cutoff. This ensured the rocket reached the correct velocity before entering its ballistic free-fall trajectory.

The development of the A4 was led by Wernher von Braun at the Peenemünde Army Research Center. Von Braun had been interested in rockets since his youth, even building a homemade toy rocket car. He worked alongside other key figures like Walter Dornberger and Walter Riedel. The project was heavily influenced by the research of American physicist Robert H. Goddard. By late 1941, the Peenemünde center had mastered the essential technologies for the A4. These included large liquid-fuel engines, supersonic aerodynamics, and gyroscopic guidance.

However, the production of these weapons involved great human suffering. The rockets were constructed at the Mittelwerk site using forced labor. Approximately 12,000 laborers and concentration camp prisoners died during the production process.

Additionally, the attacks launched by the rockets resulted in the deaths of an estimated 9,000 civilians and military personnel. Despite the massive cost of the program, historical assessments show the V-2 had little strategic impact on the outcome of the war.

Even though the V-2 was a weapon of war, it holds a unique place in space history. On 20 June 1944, a V-2 rocket reached an altitude of 100 kilometers. Because 100km is the recognized edge of space, the V-2 became the first artificial object to travel into space.

After the war, the technology was highly sought after by the United States, the United Kingdom, France, and the Soviet Union. Through Operation Paperclip, captured hardware and scientists were moved to different countries. This technology directly influenced the development of later ballistic missiles and the beginning of modern spaceflight.