The pros and cons of airplanes in the past, the pros and cons of airplanes

Since I can only pass a **, I only inserted the aircraft of the First World War, this kind of aircraft is generally a biplane (as shown in the picture) or monoplane-based, the fuselage is generally made of wood, the weight of the fuselage is large, at the same time, the cockpit is exposed so that the aircraft does not fly high, flying not fast, the aircraft of World War II are generally made of metal, not alloy, although the strength is stronger than the aircraft of the First World War, but the weight is heavier, and all the air actions of the aircraft of the Second World War are due to the absence of a hydraulic power system, or a hydraulic servo system, After World War II, civil aviation began to develop vigorously, and the flight speed has also been significantly improved, and the aircraft can change the aspect ratio to change the flight speed (aspect ratio: the area of the large wing of the aircraft is the ratio of the connection line of the wingspan of the large wing and the two wingtips of the large wing) The greater the aspect ratio, the greater the flight speed, you can compare the Concorde aircraft, his aspect ratio is very large, he is a supersonic passenger aircraft. At the same time, modern civil aircraft are generally transmitted by wire, hydraulic transmission, steel cable transmission mode to drive the pilot's control signal, greatly reducing the physical load of the pilot, and the modern aircraft is very intelligent, humanized, basically all the problems in the sky can be solved for the pilot, even if the pilot falls asleep in the air cruising stage, it doesn't matter.

The landing gear is also a revolutionary change, the landing gear of the previous aircraft including B707 is the rear three-point type, that is to say, the overall center of gravity of the aircraft is behind the main landing gear, the aircraft must make the main landing gear located in the front of the landing first, in this case, some aircraft will be planted when landing, because the main landing is over, and the center of gravity is not easy to control at the rear of the aircraft, modern aircraft all use the center of gravity in the front of the main three-point landing gear, when the main take-off landing, The center of gravity presses the center of gravity down with the inertia of the fuselage, so that we see it as if the plane is slapped on the ground, very safe, the aircraft has been developed for almost 100 years, and every new model is launched to make up for the shortcomings of the old model, so there are many advantages and disadvantages.

The advantage is that it shortens the time and is convenient. The downside is that it's noisy. That's all I know.

1. Benefits: Safe, comfortable and fast flight.

Second, the disadvantage, or the inconvenience:

1. The airport is generally far away from the city, so you need to arrive at the airport in advance, and it will take a certain amount of time to get to the city after the plane arrives at the destination;

2. The check-in procedures are more complicated, valid ID documents are required, check-in procedures are required, and the luggage has restrictions on volume, weight and quantity, and prohibited items cannot be carried through the security check. If you have checked baggage, you will need to wait to collect it upon arrival;

3. Flights are prone to delays due to weather, flow control and other reasons;

4. The ticket price is more expensive, and the flight within 1000 kilometers is at a disadvantage compared with the high-speed rail, and the consumption of catering and entertainment at the airport is also higher.

Due to the fast speed of the aircraft and the short flight time, it is beneficial for passengers to save physical strength and have a low sense of fatigue. At present, the jet civil aircraft used by various airlines has a speed of 500 to 1,000 kilometers per hour, and its continuous range can reach more than 10,000 kilometers, making it one of the fastest means of transportation in the world. The purpose of people traveling is to play and enjoy life.

Fast, easy, comfortable and safe are all benefits of flying.

Hello Hunger Qi, happy to answer for you! The following impacts are available for you. Air pressure, air temperature, atmospheric density.

These factors affect the distance of the aircraft during take-off and landing, the ceiling and load of the aircraft, and the consumption of fuel. Experts pointed out that the accurate landing and high-altitude flight of the aircraft are inseparable from the field pressure and standard atmospheric pressure, and the temperature has a great impact on the load of the aircraft and the gliding distance during take-off and landing. As the air temperature rises, the air density decreases, the resulting lift decreases, the aircraft load decreases, and the take-off and taxi distance becomes longer.

Wind this rock. The wind affects the distance and time it takes for an aircraft to take off and land. According to experts, the general aircraft take off and land against headwinds, and the crosswinds cannot be too strong, otherwise they cannot take off and land.