What is the famous saying that all aircraft design departments in the world have in common?

all the aircraft design departments in the world have a famous saying: strive to reduce the weight of each gram of the aircraft.

"Strive to reduce the weight per gram of aircraft" is the motto of aircraft designers all over the world. Weight reduction of aircraft means that the fuel consumption of aircraft is small, the cost is low, it is more environmentally friendly and energy-saving, and carbon dioxide emissions are reduced. Under this concept, many airlines, aviation design and manufacturing units have made unremitting efforts for this. Air India can save $5, a year by recruiting slim stewardesses to save money.

In order to save fuel, an Indian airline named GoAir recruits flight attendants who are mainly slim women. The average weight of slim stewardesses is 15-2kg lighter than that of men. The company calculated that every extra kilogram of weight in air flight will cost .5 cents per hour. The new recruitment standard is expected to save $5, a year. In order to reduce carbon dioxide emissions, ANA requires passengers to "urinate" in the toilet before flying.

All Nippon Airways says that if the passenger's bladder is "empty", it will reduce the weight of the plane during flight, thus reducing the fuel consumption. ANA staff will ask passengers to go to the toilet "conveniently" before boarding the plane to lose weight. The company hopes that the "saved" weight can reduce 5 tons of carbon dioxide emissions within one month. Air France lightens the weight of plastic water cups on aircraft to reduce fuel consumption.

under the condition of ensuring flight safety, Air France tries to reduce the weight of aircraft and avoid unnecessary fuel consumption, so as to reduce carbon dioxide emissions. For example, the weight of a small plastic cup used by passengers in the cabin to drink champagne, cola and other drinks has been reduced from 13 grams to 9.5 grams. This small "slimming" of 3.5 grams can reduce carbon dioxide emissions by 2 tons a year after being extended to all flights of Air France. Air Canada uses iPad to lose weight in the cockpit.

Air Canada used iPad instead of paper manual in the cockpit. Although it doesn't sound new, it works well. Each pilot's paper manual weighs about 35 pounds, which means that more than 1 pounds will be added on the long-distance route of two units. Using iPad instead of paper manual can not only reduce the weight of aircraft and fuel consumption, but also update the content regularly to improve efficiency. Air in JAZZ, Canada is equipped with buoyancy equipment instead of life jackets to reduce the weight of the aircraft.

Canada's Ministry of Transport, Infrastructure and Community stipulates that if a passenger plane flies within 5 nautical miles (92.6 kilometers) from the coastline, airlines can equip the cabin with buoyancy devices instead of life jackets. At present, JAZZ uses the cabin cushion as a buoyancy device. A commercial life jacket weighs about .5 kg. JAZZ's passenger plane carries 5 passengers, and the total weight of the life jacket equipped on board is about 25 kg. British Airways has taken various weight-loss measures to reduce operating costs.

British aviation staff are required to pay attention to personal weight, reduce the packaging of airplane meals, reduce the supply of iced drinks on board, reduce the size of knives and forks, adopt lighter tableware, replace heavy dining cars, cancel the distribution of sugar bags and headphones, etc., and also reduce the size of airborne magazines to reduce the total weight of airplanes and reduce operating costs. Ryanair's in-flight magazine "Traveling with Ryanair", the paper size of the magazine was reduced from A4 to A5, and the bottom was used as the menu. Virgin Atlantic's method is to reduce the packaging of food, for example, bread will no longer be packaged with plastic wrap, and finally achieve the goal of non-packaging food. In addition, Virgin has also introduced lighter seats and trash cans, which can reduce the weight of thousands of tons per plane every year. American Airlines set up an energy conservation and consumption reduction team to cope with rising fuel prices.

In p>25, American Airlines, headquartered in Fort Worth, Texas, set up a special energy-saving and consumption-reducing team to "tamper with" places where passengers are not easy to detect and reduce the aircraft load. For example, the team "removed" the socket and power converter in the bathroom of the aircraft cabin, and removed the telephone behind the aircraft seat and the telephone line buried in the seat. In 27, the silver tableware used in business class and first class was replaced with tableware made of lighter materials. Through weight reduction measures, the company estimates that it can save about 42 million liters of fuel every year. Spring Airlines has refined hundreds of fuel-saving measures to "slim down" the aircraft.

In 29, when the financial crisis spread, the net profit of Spring Airlines was 158 million yuan, an increase of 524% over the previous year. One of the secrets of rising profits is to reduce costs. In the spring and autumn, hundreds of fuel-saving measures were refined. In addition to optimizing routes and aircraft height and speed, most airlines also saved fuel by "slimming" aircraft. Generally, the water carried by airlines is full, but it is required to carry water according to the demand of the line in spring and autumn, and many flights only carry one third; Generally, there is a dining car on the plane, but it also disappears on the plane in the spring and autumn to reduce the weight of the plane. Improve and upgrade the structure of on-board entertainment equipment to reduce the weight of the equipment.

as one of the major manufacturers of in-flight entertainment equipment, the newly-launched eXLite products of Panasonic Corporation of Japan come from XSeries series. Its advantage is mainly the improvement of the structure, which only needs to be upgraded on the basis of the original equipment to remove redundant components. This not only avoids a lot of disassembly work, but also reduces the weight of the upgraded equipment by 3%. Similarly, TopSeries, an in-flight entertainment equipment produced by Terez, France, is suitable for 7-seat Bombardier CRJ aircraft and 55-seat Airbus A38 aircraft, and the average weight reduction is about 3.8 pounds per seat. The high-performance carbon/carbon brake disc developed by AVIC Brake can reduce the weight of aircraft brake device by 3%.

these carbon/carbon brake discs will be applied to China civil aviation A32 aircraft. It is understood that the high-performance carbon/carbon brake disc developed by AVIC Brake can reduce the weight of aircraft braking devices by about 3%, which is undoubtedly a revolution for the aviation manufacturing industry. Carbon/carbon composite brake materials have been widely used in military aircraft and civil aircraft in developed countries.