Why the actual flight distance is much longer than the designed flight distance?

2022-06-16 0 By

As the first large-scale strategic military transport aircraft independently developed by China, the appearance of the Y-20 not only fills the gap in China’s strategic transport field, but more importantly, the Y-20 equipment has flown out of the country for many times to verify its intercontinental delivery capability, and at the same time, it also timely sends warmth for China to assist other countries.In particular, after the volcanic eruption of tonga, an island country in the South Pacific, China promptly dispatched two Y-20 planes to Tonga, delivering dozens of tons of medical aid supplies, which further demonstrated China’s great power sentiment and y-20’s strategic transport capacity.However, a closer look at the yun20’s flight path revealed that yun20 was unable to refuel on its return trip due to tonga’s small size, so it took off from Guangzhou in Suva, capital of neighboring Fiji, 650 kilometers away from Tonga.This is normal, but the strange thing is that according to the design of yun20, when the weight of Yun20 reaches 16.5 tons, its maximum design range is only 7,800 kilometers, but the straight-line distance from Guangzhou to Suva, the capital of Fiji, is 8,300 kilometers, and it is conservatively estimated that the real flight range is at least more than 8,500 kilometers.So why is it so much farther than it was designed to be?Many people may find this inconceivable, or they may think that driving a transport plane is like driving a car, and the actual distance is directly related to driving habits and parameter calibration.Cars, for example, are designed to have a range of 800 kilometers on a tank of fuel, but most people can still travel dozens of kilometers longer with their fuel gauge flashing constantly.Or it could be directly related to driving habits, such as violent driving, so a tank of fuel will not travel as far as a pilot driving smoothly.The claim right, of course, but carrying 20 to flight distance is far than setting, mainly because of the following two reasons: one, don’t know how many people still remember, when the carrier rocket launch satellites, if the rockets fired from the west to the east, on the basis of the take-off weight, weight than in other directions flight;Or is it more fuel efficient at a certain take-off weight?This is mainly because the earth rotates from west to east, so launching a rocket from west to east can take advantage of the Earth’s inertia, greatly saving fuel and thrust, or increasing the launch weight.Also, the actual flight distance of y-20 from Guangzhou to the capital of Fiji exceeded the set distance, which is also related to the rocket launch.As yun 20 flies from Guangzhou to Fiji, it is constantly flying from low latitudes to the equator, taking advantage of the earth’s rotation from west to east.Because the rotation of the earth during its flight gives the Y-20 a greater acceleration advantage, it can fly faster and glide farther with lower fuel consumption, so its actual flight range is longer than scheduled, which is another reason.Second, the long-term actual flight distance of an aircraft in the atmosphere is directly related to the aerodynamic design of the aircraft and the level of flight fuel consumption, but also directly related to the climate change during flight.From the end of January to the middle of February every year, the direction of the pressure group and wind belt near the equator will change. The main performance is that the low pressure belt near the equator is more southerly, while the direction of the wind belt on both sides of the equator will blow toward the equator, and they are easterly blowing from east to west.As for Y-20, during its flight to Fiji, it was flying closer and closer to the equator, and most of the flight routes were near the equator. Therefore, with the help of the easterly advantage near the equator at the end of January, in the first half of the journey when Y-20 was close to the equator, although the range was not significantly improved due to the influence of easterly wind,But when shipped after 20 to Fiji, around the equator during the second half of the voyage, influenced by near the equator east, the east wind gives 20 larger wind speed, increase the 20 flight lift, then for carrying 20, in the case of lift more, carry the same goods, the thrust output must be smaller, there would be more save fuel, distance is farther.So why did y-20 fly farther from Guangzhou to Fiji than it was supposed to?In addition to the faster acceleration given by the earth’s rotation, the y-20 enjoys more lift and saves more fuel due to the east wind near the equator, so the actual flight distance is longer than the set distance.