Precious stones HS code classification

List of the catalog of this article:

• 1, Has the test flight of China's new hypersonic aircraft been successful?
• 2
  、 What kind of jet engine does the American SR-71 "Blackbird" reconnaissance aircraft use?
• 3, Is the difficulty of stamping the engine like lighting a match in a tornado?
• 4, What kind of black technology does the SR-71 strategic reconnaissance aircraft known as high-altitude spies have?

Has the test flight of China's new hypersonic aircraft been successful?

1. According to the report of China Aviation News Network, a new high-speed sound verification aircraft in China's test flight center was successfully tested. The aircraft has the characteristics of high-air and unique high-speed flight mode. Although the original report does not reveal the specific model and task of the model.

2. Recently, China Aviation News Network (affiliated to China Aviation News Agency) made a big news that China successfully tested a supersonic aircraft! However, the news release was deleted soon after.

3. The first flight on May 14th. At 6:52 on May 14, 2022, the C919 aircraft numbered B-001J took off from runway 4 of Shanghai Pudong Airport and landed safely at 9:54, marking the successful completion of the first flight test of the first C919 aircraft that China Commercial Aviation Company is about to deliver to the first user.

4. According to Lianhe Daily, China has launched a small multi-purpose reusable aerial vehicle. With China testing this hypersonic aircraft, the space aircraft competition between countries has entered a heated stage.

5. A new generation of passenger aircraft with international characteristics, which has sailed more than 5,500 kilometers.Why does China develop large passenger aircraft? Now the dispute between Russia and Ukraine has informed the necessity of domestic aircraft in China.

6. At 11:38 on November 10, the domestic large passenger aircraft C919 aircraft 10101 took off from Runway 4 of Shanghai Pudong Airport. After a flight of 2 hours and 24 minutes, it successfully arrived at Xi'an Yanliang Airport at 14:02, successfully completing the first intercity flight.

What kind of jet engine does the American SR-71 "Blackbird" reconnaissance aircraft use?

SR-71 adopts Universal's J-58 axial flow engine, with a rear-fuel combustion chamber, and a single maximum thrust of 14,460 kN. At present, most jet aircraft use turbofan engines. The special feature of the SR-71 is that it takes into account the superior performance of the axial flow engine when flying at high speed.

SR-71 reconnaissance aircraft uses two普惠 J-58 engines, which is the only military engine that can continuously use the booster combustion chamber. The higher the flight speed, the efficiency of the engine also improves.Each J-58 can produce a thrust of 151 know.

This is the Pratt Whitney J-58-1 turbojet subfuel stamping combined cycle engine used by the SR-71 reconnaissance aircraft. This is the Pratt Whitney F-135-PW-100 turbofan engine used by the F-35 multi-purpose fighter.

SR-71 reconnaissance aircraft (English: SR-71, nickname: Blackbird) is a jet-type long-range high-speed strategic reconnaissance aircraft used by the U.S. Air Force.

Is the difficulty of stamping the engine like lighting a match in a tornado?

1. The supersonic combustion stamping engine, referred to as the supercombustion stamping engine, can collect oxygen from the atmosphere during the climbing process.Giving up carrying oxidants, obtaining oxygen from the flight and saving weight means that under the condition of consuming the same mass of propellant, the supercombustion stamping engine can produce four times the thrust of the rocket.

2. When describing the flight of the X-51A verification machine, the American Christian Proverbs said that it was faster than "Superman", and also metaphorically, the technical difficulty of its supercombustion stamping engine was like lighting a match in a hurricane and not letting the flame go out.

3. We came to the exhibition hall in Area A again, where I saw the stamping engine, which was as difficult as polishing a match in a tornado. The stamping engine is to first put the air directly into the combustion chamber, mix the air and fuel, and then spray the mixture out of the engine to generate thrust. It is mainly used in rockets and missiles.

4. However, the supersonic stamping injection engine technology was not paid attention to when it first appeared, which is also forgible, as the engineers said: "At that time, when the engine using this technology was tested in the wind tunnel, it was impossible to run at all. Starting and keeping the engine running normally is like lighting a matchstick in a hurricane.

5. Light a match, put it 15 cm away from your body, and then blow it hard. If you blow it out, your lung function is normal.

What kind of black technology does the SR-71 strategic reconnaissance aircraft known as high-altitude spies have?

Has height andThe double guarantee of speed, followed by the excellent ground detection performance of the SR-71. Under the eyes of the SR-71, there is almost no secret. According to the data declassified later, some people believe that the photos taken by the SR-71 reconnaissance plane flying at a height of 10,000 meters can even see the license plate of the car on the ground.

As a product of the Cold War period, the SR-71 Blackbird high-altitude reconnaissance aircraft, as a black technology, has adopted a considerable amount of advanced technology in the process of research and development. Its flying mechanism is like alien technology, giving people a strong visual impact and shock.

SR-71 reconnaissance aircraft is a jet long-range high-altitude high-speed strategic reconnaissance aircraft used by the U.S. Air Force. Developed and produced by the skunk factory of Lockheed Company in the United States, it adopted a large number of advanced technologies at that time. It was the first practical jet aircraft to successfully break through the thermal barrier.

The advanced high-altitude strategic reconnaissance aircraft of the United States, the legendary work of the skunk factory, the strong place beyond the reach of missiles, the pinnacle of the 1960s - Lockheed SR-71 "Blackbird" reconnaissance aircraft, the shape of a bat, reasonable pneumatic layout, slender fuselage, makes people We all marveled that this is an alien technology.

The resume of SR71 "Blackbird" There are many wonders in the world. Have you ever seen a reconnaissance machine that can fly 30,000 meters? It is really hard to imagine that an American reconnaissance aircraft can fly so high at this altitude. This reconnaissance aircraft is the SR-71 "Blackbird" and is also a high-altitude high-speed reconnaissance aircraft of the U.S. Air Force.