What are the most incredible machines made by human beings?

1964, SR-7 1 was born, which was four times the flight speed of U-2, saving the honor of the US military and the president. SR-7 1 adopted many advanced technologies at that time, not only adopted low detectability technology in design, but also avoided enemy planes and anti-aircraft missiles at high speed of Mach 3. In actual combat records, SR-7 1 has never been shot down.

SR-7 1 is designed to have a very small radar cross section (RCS), which is an early stealth design. However, did the engineer forget that the plane has an engine? High temperature engines will emit droplets! Even if the fuel uses cesium to interfere with the radar, the temperature will still drop. . . So even though there are many stealth technologies, blackbirds have huge infrared characteristics when flying at high speed (is there any sound? ) make it completely invisible. SR-7 1 is one of the biggest targets on the FAA long-range radar. It can be traced hundreds of miles away, let alone an enemy country ~ ~ ~

It is an insult to any country, especially Russia and North Korea, that intelligence is overhead. Although the reconnaissance operation in the United States is carried out in secret, the temperature in many places of the plane can reach 900 degrees, and it keeps emitting heat. You should know that the American spy plane is overhead, but the troops below are completely helpless.

SR-7 1, which has been wagging around the world with the enemy for more than 30 years, successfully got rid of thousands of interceptions and attacks on it, most of which came from aircraft and air-to-air missiles of the former Soviet Union, because its speed and altitude were three times higher than those of commercial flights at that time.

Attached are two jokes about the famous SR-7 1.

"I will always remember the wireless communication that day, when I was crossing with Walter (my backseat driver) over Southern California at an altitude of 13 miles.

"When flying into the airspace of Los Angeles, we have been monitoring the communication between other aircraft in the air and the flight control center. Although the flight control center doesn't really control us, it always monitors us on its own radar. At this moment, I heard a Cessna pilot request the tower to read his ground speed.

"Article 90." Tower response.

After a moment of silence, a twin-engine Beechcraft also asked the tower to read its ground speed.

"Section 120." The tower replied.

"Obviously, we were not the only ones who were proud of our ground speed that day, because almost immediately, the proud voice of an F- 18 pilot' Oh, Center,' Dust 52' needed to be read out at ground speed. "

"after a short silence, the tower replied,' the ground speed is 525 knots, dust.'

"It is a brief silence. Just as I was eager to consider whether the time was ripe, I heard the familiar click of the radio switch from the back seat. At that moment, I knew that Walter and I had become real partners.

"Center, this is poplar 20. We need ground speed readings, over. "

"After a much longer silence than usual:' Poplar', what I read here is, uh ... 1742.

"On that day, no one asked for a ground speed reading on that channel."

The following is another famous conversation between SR-7 1 and the Los Angeles Tower:

"Request the right to use airspace at an altitude of 60,000 feet, over."

Silent for a while, there came a slightly surprised and ironic voice from the tower dispatcher:

"How are you going to climb to that height?"

Silence. The pilot replied:

"We won't climb to that height. We're going down to that height. It's over. "