After returning from the Soviet Union, Ma Fengshan brought back a notebook, which made outstanding contributions to the success of H -6. In the early 1960s, the Soviet Union perfidiously suspended the contract and withdrew the experts. China had to solve the trial production of the H -6 aircraft by itself, but the H -6 aircraft only got a comprehensive strength data from the Soviet Union, which is the synthesis of all conditions of the whole aircraft, only the answer, no calculation process and report. H -6 aircraft needs to do structural static test, prepare for flight test, deal with daily production, and make future improvement and modification. Xi 'an Aircraft Company wants to supplement these technical documents that are not provided by the Soviet Union, but most people who go to the Soviet Union can only give a rough idea, so they have to ask "Ma Fengshan's Notes" from a distance. This notebook became a top secret document hidden in the secret room. At first, designers have to go through layers of political approval before they can see beauty. He is not allowed to spend the night in the office or pick it up. It was recorded in a thick soft-cover student exercise book produced by the Soviet Union. The handwriting is beautiful and neat, which contains a lot of key information such as the overall situation, strength and flight test of Tu-16 aircraft. This was recorded in 1959 when Comrade Ma Fengshan and others went to the Soviet Union for internship. Before being ordered to visit the Soviet Union, he carefully prepared, taught himself Russian and studied hard. Ma Fengshan's profound technical skills enabled him to grasp the key points, absorb foreign advanced experience like a sponge, and record almost all useful and important data. Don't say that our country didn't have the conditions to do the high-speed wind tunnel test of an aircraft as big as H -6 at that time, and the time was too late. Even if we do the wind tunnel test, it is difficult to guarantee that the results are consistent with those of the Soviet Union. If the static test load of H -6 is very different from that of the Soviet Union, it will also cause many problems. This will greatly affect the already tense trial production progress. In addition, Tu-16 aircraft was designed before the promulgation of Soviet strength criterion 1953, but it did not completely follow the strength criterion of 1947. In fact, it is precisely because of the design practice of Tu-16 aircraft that the Central Institute of Fluid Mechanics of the Soviet Union was able to modify the new problems encountered into the strength criterion of 1953. Ma Fengshan's Notes contains Tu-16 Aircraft Static Test Investigation Report, Tu-16 Aircraft Strength Calculation Raw Data Summary Report and Tu-16 to Tu-104 Structural Change Investigation Report, which has great technical authority and is used in China. This precious note has solved many technical problems and puzzles for us, and helped us to fill in the deficiencies of many original data of Tu-16 aircraft. The zero-lift drag coefficient and maximum lift coefficient of H -6 aircraft are taken from Ma Fengshan's Notes. Until the 1970s, when determining the first rollover period of H -6 aircraft, the data in Ma Fengshan Notes was taken as a reference, which was recognized by the senior leadership. Ma Fengshan has made immortal contributions to the successful trial production of H -6 aircraft. 1970 In the middle period, after the spirit of Shanghai's plan to build aircraft was conveyed, Xifei was instructed to quickly put forward Shanghai's aircraft plan. Ma Fengshan organized a general team study in Xifei, and put forward a plan to change it with H -6, which can make use of some parts of H -6. He pointed out many times that although it is based on H -6, it is necessary to avoid the shortcomings of Tu-104, such as high noise and low efficiency, and avoid copying it. Ma Fengshan's plan to change the H -6 plane into an airplane was approved by Shanghai and its superiors and became the start-up plan of the "708 Project".
After in-depth work, it is found that there are many insurmountable defects in the modification scheme of H -6, which can not meet the application requirements. Ma Fengshan lost no time and decided to switch to a scheme similar to Boeing 707, with the engine hanging under the wing. The brewing of this scheme was reported to Cao Lihuai, deputy commander of the Air Force, at the beginning of 197 1 and in April of 1, and then the scheme of changing to H -6 was formally abandoned, and the development was carried out according to the wing suspension scheme, and the high and low speed wind tunnel tests were started. According to the instructions of the office meeting of the Central Military Commission, 1972, from August 5 to 22, Shanghai and the Third Machinery Department jointly held a joint review meeting on the overall design scheme of a large passenger plane (code-named "Project 708") in Shanghai Yan 'an Hotel. Experts attending the meeting agreed that the guiding ideology of the overall design of the aircraft is basically correct and the overall design scheme is basically feasible. 197119, Pakistan International Airlines Boeing 707 crashed in Xinjiang, and its wreckage is of course of great reference value to the design of Yun 10. What I want to emphasize is Ma Fengshan's courage and boldness in pursuing truth. He resolutely gave up the original plan and adopted the current plan of Yun 10 wing crane, which was made without any information and reference prototype. Ma Fengshan is very lucky. For Yun 10, Xinjiang remains are really pies falling from the sky, and opportunities are always given to those who are prepared. 1August, 1980, I went to work in Shanghai as a member of the first flight inspection team of the Third Machinery Department. Ma Fengshan, the chief engineer, can face the shortage of aircraft scientifically and objectively with the high enthusiasm of victory in sight. He truthfully pointed out that due to import restrictions, the performance of some domestic high-strength materials used in aircraft is still not ideal, and the fatigue analysis and test of aircraft body are limited to objective conditions, which takes time. Ma Fengshan is full of confidence in carrying 10 aircraft. He has repeatedly told the organization that it is absolutely safe to make the first flight with 10. He can issue a military order. He can save his life and is willing to randomly set the sky in the first flight. What happened after the first flight of Yun 10 was unexpected by Ma Fengshan, who fought for it day and night. Ma Fengshan made a lot of efforts, made a lot of appeals, and thought of many ways to transport the 10 plane. What puzzles him is why the state does not give long-term comprehensive consideration to such a big project. If it was abandoned long ago, why didn't it stop earlier? Why do we have to wait until the plane comes out and there is no fuel to test it? When Shanghai and the country decided to introduce McDonnell Douglas MD-82 assembly line, Ma Fengshan repeatedly stressed that the self-developed line could not be lost. This also forced McDonnell Douglas to add the terms of joint development of new machines when signing a cooperative production contract with China. Ma Fengshan affectionately called him an "old horse" before his death. He is indifferent to fame and fortune all his life, regardless of his personal reputation and status. He is warm and sincere, never puts on the airs of leadership, always treats everyone equally, and is willing to talk with everyone and make friends. He is experienced, knowledgeable and experienced, but he never condescends to anyone. In the eyes of young comrades, he is a respected and trustworthy kind elder. More people sincerely regard him as a loving, diligent, respectable and amiable teacher. In the process of developing Cloud 10, Ma Fengshan was not dragged down by poverty, family difficulties and physical illness, but made progress despite difficulties and persevered, and really did his best. Ma Fengshan has many hobbies. He is good at calligraphy, Beijing opera, classical and modern music, bridge and chess. He plays the erhu very well and is good at singing old songs. But in order to concentrate on his favorite aviation career, he never allowed himself to fiddle with things, and spent too much time on these hobbies, so that even his comrades who worked under his leadership for many years did not know his hobbies. During his sick leave, Ma Fengshan was still very concerned about the development of China aviation industry. He was deeply worried about the success of the test flight of Yun 10 aircraft and stopped developing it. He reported to his superiors many times, hoping to continue to develop and produce Yun 10 aircraft. Entrusted by the Ministry of Aviation Industry from 65438 to 0986, he led a group of technicians to McDonnell Douglas Company in the United States to participate in the cooperative research of Gao Han Dobby (propeller fan) technical preparation project, and completed a lot of research work. 1986 65438+On February 20th, Ma Fengshan was approved by the State Science and Technology Commission as a national-level scientific and technological expert with outstanding contributions. 1987 12 15 was approved as a researcher-level senior engineer by the Ministry of Aviation Industry, and was employed as a researcher-level senior engineer by the Ministry of Aviation Industry 640. 1On March 27th, 1989, the Ministry of Aerospace Industry hired Ma Fengshan as the chief designer consultant of trunk aircraft. 1On April 24th, 990, Ma Fengshan died in Shanghai at the age of 6 1.