Is MIG -25 the fastest plane?

The fastest plane in the world is not a military plane, but I can't remember its name either! But SR-7 1 is the fastest plane I know. It's a reconnaissance plane with a maximum ceiling of 37,000 meters. It even flies faster than a rifle bullet! The fastest flight speed is 1 100 meters per second. This is faster than most rifle bullets!

It flies too high, which makes conventional air defense weapons unreliable (such as air cannons), and it is difficult for air defense missiles or surface-to-air missiles to hit it with electronic jamming equipment. It seems that it has never been shot down!

I found some information. Look at it!

SR-7 1 "Blackbird" is a high-altitude and high-speed reconnaissance plane of the US Air Force. The flying height reaches 30,000 meters and the maximum speed reaches 3.5 times the speed of sound, which is called "Double Three". Therefore, SR-7 1 flies higher and faster than most existing fighters and air defense missiles, so it is not really threatened by the "bullets" in the Soviet Union and China. During the reconnaissance of Israel's nuclear facilities over Israel, Israeli F-4 fighter planes fired AIM-9 rattlesnake air-to-air missiles, but the flying speed of the missiles was slower than that of SR-7 1.

SR-7 1 is the first practical jet plane to successfully break through the "thermal barrier". "Thermal barrier" refers to the problem that when the aircraft speed reaches a certain level, friction with air will generate a lot of heat, thus threatening the structural safety of the aircraft. Therefore, titanium alloy with light weight and high strength is used as the structural material for the fuselage; The wing and other important parts are designed to adapt to thermal expansion, because when SR-7 1 flies at high speed, the fuselage length will be extended by more than 30 cm due to thermal expansion; The oil tank pipeline is ingeniously designed, adopting an elastic box body, and using the oil flow belt to increase the heat at high temperature. Although many measures have been taken, the oil tank will still leak to some extent after SR-7 1 landed, due to the thermal expansion and cold contraction of the engine block. In fact, SR-7 1 usually only needs a small amount of fuel when taking off, and refuels in the air after climbing to cruising altitude.

The development of SR-7 1 began with 1959, the bullock cart project implemented by the US Air Force and Lockheed Martin Company. The original purpose of the plan is to design a fighter that can intercept at high speed at an altitude of more than 20,000 meters. 1962, the first test aircraft of the project, A- 1 1 (pictured left), was tested. In order to hide people's eyes and ears, the aircraft used the title of YF- 12 fighter in its publicity. After a large number of flight tests of A- 1 1 and the fire control and weapon systems added later, the US military decided that the fighter technology was not mature enough and gave up the plan. However, the excellent performance of A- 1 1 made the US military decide to use it as an improved high-altitude high-speed strategic reconnaissance plane, which made SR-7 1. The fire control and weapon system on A- 1 1 also laid a good foundation for the development of naval F- 14 fighters. The main difference in appearance between A- 1 1 and later SR-7 1 is that there is a cut between the side strip and the nose radome, while SR-7 1 does not.

A- 1 1 has two crew members: the pilot and the weapon operator. The corresponding SR-7 1 also has two members: the pilot and the system operator. The cockpit is connected in series. Because the flight altitude and speed of SR-7 1 are beyond the human body's tolerance, the two members must wear fully sealed flight suits and look like astronauts.

SR-7 1 is equipped with advanced electronic and optical reconnaissance equipment, but they are in absolute secrecy and little is known to the outside world. However, through the analysis of its flight speed and optical camera, it is considered that it can complete the optical photography reconnaissance task with an area of 324,000 square kilometers in 1 hour. Figuratively speaking, it only takes 6 minutes to take high-definition photos covering the whole of Italy. The performance of its optical lens is beyond ordinary imagination, but the resolution is highly confidential. In order to avoid the error caused by the forward flight of the aircraft (even if the shutter flashes, SR-7 1 will move forward for a certain distance. ), reconnaissance cameras are installed on the guide rail, and move backwards when shooting, so that the cameras are stationary relative to the ground.

The SR-7 1 in the above picture is the only SR-7 1 trainer, nicknamed "Titanium Goose". The instructor sits in the back cabin, so the back cabin is higher than the front cabin, which gives the instructor a good view and is conducive to observing the surrounding environment.

Because the task of SR-7 1 is often to carry out long-range strategic reconnaissance, aerial refueling has become its daily routine. Of course, the endurance of SR-7 1 itself is also quite good. During the Cold War, the frequent flights of SR-7 1 included: Kadena base in Okinawa, Japan-North Korea; Turkey-Soviet Caucasus; Philippine-Lanzhou, China. Due to the high maintenance cost, SR-7 1 was retired in the late 1980s and transferred to NASA for high-altitude and high-speed scientific research, so the words NASA can be seen on the vertical tail. However, some Sr-7 1 re-served in the Gulf War.

The picture below shows a "titanium goose" taking off. The engine sends out a pulsed high-temperature jet, and the edge strip and the wing tip pull out a white airflow vortex. SR-7 1 Pratt & Whitney J-58 axial flow engine with afterburner, maximum thrust of single engine 14460 kN. At present, most jet planes use turbofan engines, and the uniqueness of SR-7 1 is that the axial flow engine has excellent performance at high speed. There is a freely adjustable shock cone at the front end of the engine inlet to meet the different requirements of air intake when flying at different speeds.

Under the shadow of the layers of "shady" set by Americans, people can't understand the truth of the "Blackbird" family for a long time. In fact, there are three generations of blackbird family, namely, blackbird series aircraft: A- 12, a single-seat reconnaissance aircraft of the CIA and its derivatives, YF- 12A, an experimental fighter of the US Air Force, and SR-7L, a strategic reconnaissance aircraft. These three types of aircraft made 15, 3 and 3 1 respectively. At present, there are only four blackbirds in use: two SR-7 1A re-service models used by the 2nd Division of the 9th Reconnaissance Wing of the US Air Force, one SR-7 1A and one SR-7 1B used by the Dryden Flight Research Center of the National Aeronautics and Space Administration (NASA).

Among the three generations of "blackbird" families, only A- 12 ox cart and SR-7L blackbird were actually used by the development and equipment forces, but the advent of SR-7 1 was inseparable from the first two. If we understand the context of the first two, we will naturally understand the origin of SR-7 1.

The CIA's secret spy plane A- 12

A- 12 "Oxcart" is a high-altitude high-speed reconnaissance plane developed by Lockheed for the CIA in 1959. The prototype A-LL of SR-7 1 introduced by some news media is actually A- 12 "ox cart". As early as 1955, shortly after the first test flight of the U-2 reconnaissance plane, Lockheed's "Skunk Works", which was responsible for development and research, began to carry out basic research on the successor of U-2, the supersonic reconnaissance plane with reduced radar cross-section. In order to deal with the Soviet radar system with gradually improved technical performance at that time, under the leadership of kelly johnson, a famous designer of U-2 aircraft, Skunk Works carried out a project code-named "Enthusiasm" to study a new reconnaissance plane with a speed of M3 and a greatly reduced radar cross-sectional area.

1957, the company first put forward the design scheme of the pointed triangle of the single-wing twin-turbo jet engine, code-named "Aiohangel L" (A-L for short). Then, a scheme similar to F- 104 fighter, with rhombic airfoil and single wing layout, equipped with two turbojet engines, code-named "Angel 3" or A-2 for short, is proposed. The scheme after A-3, which is the technology to reduce the radar cross-sectional area of the body, is called A series scheme, so the code name "Archangel" is not added. Therefore, A- 12, which was used in the later development of equipment, and A- 1 1, which has been publicized by the United States for a long time, whose number A is the first letter of the English word "archangel", did not indicate the purpose of the aircraft. A- 12 is modified on the basis of A-LL, which meets the requirements of the military. Competing with it is the master-slave scheme proposed by Conville Company. The plan adopts M4 speed lifting body unmanned reconnaissance aircraft, nicknamed "Fish", which is planned to be launched from B-58 Super Thief. The U.S. Department of Defense, the Air Force and the Central Intelligence Agency conducted a comparative review of the two competitive schemes, and finally chose the A- 12 scheme, which was officially approved on August 29th. 1960 65438+1On October 26th, the CIA signed a contract with Lockheed to manufacture and test the 12 A- 12 reconnaissance plane, and the A- 12 aircraft also entered the development stage. 1962 On February 26th, 1 Machine A- 12 officially left the factory in burbank, California, and was transported to the secret test base named "Dead Lake" in Nevada. 1962 On April 26th, A- 12 made its first test flight. Located in the northwest of Las Vegas, the base is a vast dry lake with a runway length of 1 1,500 meters. It carried out the flight test of U-2 aircraft and the famous "Red Flag" military exercise. In order to serve as the test and use base of A- 12 aircraft, 1964 expanded the base and built a runway with a length of 2,500 meters. 1On May 2, 962, the speed of the L aircraft reached M 1. 1 during the second test flight. On October 5th, 65438/KLOC-0, the right engine was changed from J75 to J58 with greater thrust (namely JT 1LD-20a) for test flight. 196365438+1October 15, all the left and right engines were changed to J58 for test flight. After replacing the engine with higher thrust, A- 12 reached the design speed performance: on July 30th, the speed exceeded m3; In the same year165438+1October, the designed maximum speed M3.2 was flown at an altitude of 4,800 meters. 1February 3, 964, at an altitude of 25,000 meters, the plane flew at the speed of M3.2 10 minute.

A- 12 aircraft has a wingspan of 16.94m, a captain of 3 1. 17m, an altitude of 5.64m, a wing area of 166.76m2, a landing weight of 23586kg and a maximum takeoff weight of 53070kg. The machine body is a hard shell structure made of milling alloy materials. The outstanding features of the fuselage shape are delta wings and large side strips extending from the leading edge of the wing root to the nose, and an engine is installed at the semi-span position of each wing. In the experimental stage, the plane was installed? The thrust of J75 engine of Hui Company is 68.6 kNJ58 engine is 9 1.2 kN (afterburning thrust is 140 kN), which is modified for production aircraft. The wing fuel tank is inside the engine nacelle. The fuselage is equipped with oil receiving pipe, which can be refueled by KC- 135 tanker during flight.

Use A- 12 from 1965. He has successively carried out reconnaissance missions in Cuba, code-named "Lark", and Viet Nam, China and North Korea, code-named "Black Shield". 1968, with the US Air Force equipped with SR-7 1, A- 12 was replaced by SR-7 1.

Cover A- 1 1 with A- 12.

In the A- 12 series aircraft, in addition to 12 A- 12 ordered by the Central Intelligence Agency, L-shaped two-seat A- 12b and two derivative M-2/KLOC for launching D-2 1 remote control unmanned reconnaissance aircraft in the air are also manufactured. Therefore, A- 12 series aircraft * * * made 15 aircraft.

During the five years from 1963 to 1968, A- 12 * * lost six planes, including 1 M-2 1. The first one was lost in a flight accident on May 23rd. 1963. At that time, the plane suddenly tilted upward in flight and lost control. After the pilot ejected from the plane, the plane went into a spiral crash state. The accident is strictly confidential, so the outside world does not know A- 12. Later, due to the failure of flight test, the plane was forced to land at Cortland Air Force Base in New Mexico.

1On February 29th, 964, President Johnson made a speech and released some information about the project code-named "Ox cart". The main points are as follows: A new jet testing machine A- 1 1 has been successfully developed in the United States, with a flying height of 2 1336 meters and a speed of 32 19 kilometers per hour; Now Edwards Air Force Base in California is testing several A- 1 1. A- 1 1 for military and civilian use is the crystallization of advanced technology with its excellent speed, altitude and endurance. At present, the application of these advanced technologies in long-range interceptors and supersonic passenger aircraft is being tested and studied. The plane is made of Qin alloy, which can fly at three times the speed of sound. The plan has been implemented since 1959, and members of the upper and lower houses are qualified to fully understand the development of aircraft. The airframe was developed by Lockheed burbank Factory, and the J58 engine was developed by Pu? The fire control system and air-to-air missile were developed by Hui Company and Hughes Aircraft Company.

With the release of the president's speech, the photos of the YF- 12A 1 aircraft of the plan were also released. In fact, in the president's speech, the existence of interceptors has been hinted at. Moreover, in his speech, he described the A- 12 aircraft as A- 1 1, which was not an oversight, but a deliberate attempt to cover up the actual number of aircraft. This is the fundamental reason why some news media have described A- 12 as A- 1 1 for a long time.

Two-seater A- 12b is a bus type developed on the basis of single-seater A- 12. The main improvement is to change the "Q cabin" with reconnaissance camera behind the cockpit into the second cabin. In order to ensure the vision of passengers in the rear cabin, the modified rear cabin is obviously higher than the front cabin. A- 12b only made one, nicknamed "titanium goose".

1962165438+10, A- 12b left burbank factory and was transported to Lake Experimental Base. 1963 65438+ 10 made its first flight in October. Before the first flight of A- 12, the CIA began to select and train pilots from the air force and navy so that they could undertake secret test flights. At the same time, the special squadron 1 129 was set up in Ganhu experimental base to implement the training plan.

The manufacturing number of A- 12 starts from 12 1 21to125 (No.4 machine is a two-seat A- 12b). Hui company's J75 engine, but the initial model of single-seat A- 12 and the batch production machines after 126 are all generally modified? Among J58 engines of Hui Company, only A- 12b has been using J75 engine. A- 12B adopts J75 engine with small thrust, which is actually difficult to cruise at M3 speed. Its purpose is to let those pilots who have only flown the first-class aircraft with the flight speed of Ml to 2, through the training of this aircraft, make a smooth transition to flying A- 12.

"patch panel" plan

The last two planes of the A- 12 series, with factory manufacturing numbers of 134 and 135, are the carrier-based aircraft M-2/of the D- 12 (originally numbered Q- 12) unmanned reconnaissance aircraft developed by Lockheed Company according to the "circuit board" plan. M-2 1 was modified from A- 12. The specific change is that the rear fuselage of A- 12 is equipped with a bracket for launching drones, and the original Q cabin is equipped with a cockpit for launching drones, so it is a two-seat aircraft.

1960 may 10, us air force pilot Gary? Bowles' U-2 reconnaissance plane was shot down in the Soviet Union. To this end, Americans began to explore the technology of using unmanned reconnaissance aircraft to conduct reconnaissance activities in extremely dangerous airspace, and the "wiring board" plan came out. In the number D- 12, this D not only contains the accident of remote control unmanned aerial vehicle (Dmne), but also contains the meaning of Daud2ter. The m in the mother machine M-2 1 stands for carrying the mother machine.

D-2 1 wingspan 5.80m, captain 13.06m, height 2.14m; The maximum weight is 4990kg；; Bj43-MA- 1 1 ramjet engine with thrust of 6.672 kN; The top speed is m 3.25 and the cruising range is 5550 kilometers. The camera equipment of this machine is installed in a container called a recyclable cabin under the nose. After the aircraft completes the reconnaissance mission, it can throw containers in a certain range according to the preset program or remote control instructions, and then it will be recovered by JC- 130b aircraft. D-2 1 has no landing device, and will automatically explode and destroy after being put into the recovery cabin.

1February 22, 964, M-2 1 maiden flight. The launch sub-aircraft was originally scheduled for March 1965, but it was delayed for a whole year due to various failures in the test. On March 5th 1966, M-2 1 with factory number 135 introduced D-2 1 with number 503. 1July 30, 966, during the launch test, the factor machine failed to separate from the mother machine normally, resulting in the fall of the daughter machine and the mother machine together. Although the pilot of the mother aircraft successfully ejected to escape, the transmitter operator was unfortunately killed.

The plan of "wiring board" was forced to stop because of this serious accident, and was replaced by the plan of mounting two D-2 1B "old bowls" under the wing of B-52h. D-2 1 was originally designed to match M-2 1, so it was difficult to accelerate to M3.2 when launching from the low-speed B-52h, so a rocket booster was installed at the lower part of its fuselage. In order to facilitate the connection with B-52h, an installation device is installed on the back of the machine. B-52h, which can launch D-2 1B, was dispatched from elson Air Force Base in Alaska, and actually carried out a reconnaissance mission over China.

D-2 1 finally produced only six aircraft, the manufacturing number was 50 1 to 506, and four of them were tested and launched. The other two aircraft with manufacturing numbers of 50 1 and 502 were converted into D-2 1B, and the ground and air carrying tests of B-52h were carried out. D-2 1b * * produced 32 aircraft, and the factory production numbers were 507 to 538. From1967 165438+10 to1970 February, * * * launched16 aircraft. The remaining 16, together with 50 1 and 502 of D-2 1, were sealed by the military aircraft storage and processing center stationed at Davis-Muncie Air Force Base in Arizona, and their identities were not made public until 1977.

M-2 1 "Aunt Goose" lost one plane because of the accident, and the other one only served for a short time.

Test fighter YF- 12

Although YF- 12A only ended in the trial production of three planes, there is no doubt that it is still the second predecessor of the Blackbird family.

1964, president Johnson used A- 1 1 to cover A- 12 when he announced the "ox cart" plan, implicitly revealing the YF- 12A long-range interceptor that had been developed at that time, but a-/kloc-0. Johnson is really listed.

Skunk Factory has long considered changing A- 12 "Oxcart" into a fighter, but the formal development started in September 1959. At that time, the US Air Force cancelled the development plan of the North American company XF- 108 Lightsaber fighter. XF-L08 is a M3-class interceptor fighter, based on XB-70 Valkyrie bomber, which ended in trial production. Originally planned, the aircraft will be equipped with XB-70 ASG- 18 pulse Doppler fire control radar and GAR-9 air-to-air missile (later AIM-47), which is still being developed by Hughes Aircraft Company.

Due to the huge funds for research, manufacture and use, the Air Force cancelled the plan of using XF- 108 interceptor, and the development of the corresponding new weapon system, ASG- 18 fire control radar and GAR-9 missile was also put on hold. Before the XF- 108 development plan was about to be cancelled, Lockheed, which was undertaking the development task of A- 12 at that time, persuaded the US Air Force to equip A- 12 with ASG- 18 fire control radar and GAR-9 missile, making it an interceptor fighter with three times the speed of sound. This is both economical and feasible. 1960 March 16, Kelly? Johnson proposed a fighter design scheme named AF- 12 to the Air Force, and signed trial-production contracts for three aircraft.

1962, 10 In June, the US Air Force submitted an order for AF- 12 to Lockheed, and Lockheed began trial production of three aircraft.

AF- 12 changed the Q cabin of A- 12 into the operator cabin of fire control system, which is the second two-seat aircraft in Blackbird series after A- 12b. In addition, the biggest difference between ASG- 18 radar and A- 12 radar is that the side strip originally extending to the nose is interrupted at the cockpit side. The infrared tracking sensor is arranged at the root of the front end of the side bar. Behind the sensor, there are four weapon bays on the left and right sides of the lower fuselage of the side slats along the longitudinal direction, and each weapon bay can be equipped with a GAR-9 missile. The wind tunnel test results show that the directional stability of the aircraft is reduced by cutting off the nose side of the original A- 12. So a folded ventral fin is installed under the tail of the fuselage, and a fixed ventral fin is installed under the nacelle of the engine. 1963 on June 7th, 1 on AF- 12, and 1964 on June 26th, March.

During the first flight of Unit 2, this testing machine was also called AF- 12. 1February, 964, the machine was officially named YF- 12A. Just as President Johnson announced that A- 1 1 was being tested at Edwards Air Force Base, two YF- 12A that had been tested were being transported from Ganhu Base to Edwards Air Force Base. The US Air Force believes that in order to deal with supersonic bombers developed by the Soviet Union, it is necessary to equip interceptors with twice the speed of sound, so it is required to equip 93 F- 12b. F- 12B is the planned production of YF- 12A. In order to increase the mounting capacity of the missile, the fuselage was lengthened. 1965 March 18, YF- 12A launched the missile attack test for the first time and shot down the Q-2C UAV.

Since then, YF- 12A has carried out 12 launch tests of AIM-47 missile. In another experiment, the plane successfully detected the Boeing JQ-47 stratosphere jet drone flying at an altitude of 457 meters with ASG- 18 radar. YF- 12A wing, wingspan 16.94m, length 3O.99, height 5.64m, wing area 166.76m2: landing weight 30844kg, maximum takeoff weight 56246kg. Although its body length is slightly shorter than A- 12, its weight has increased.

Although YF- 12A carried out a series of weapons launch tests and achieved success, then US Secretary of Defense McNamara refused to approve the air force to adopt the production F- 12B on the grounds of financial difficulties. As a result, YF- 12A only ended in the trial production of three aircraft. 1 96865438+1October, the U.S. Department of Defense issued a notice to suspend the implementation of the aircraft development plan, and then1aircraft was sealed up. No.2 and No.3 aircraft were used by NASA until the end of 1970s, and No.3 aircraft set a flying altitude record of 24,468.86 meters and 333/kloc in May.

Although F- 12B is the planned production model of YF- 12A, it is not actually manufactured. This model has lengthened the fuselage, can mount 8 missiles, and the internal oil load has also increased. After its production plan was cancelled, the US Air Force intended to replace the F- 106a "Javelin" interceptor, but it was suspended due to the escalating Vietnam War. Later, Hughes Aircraft Company developed the cancelled ASG- 18 fire control radar system and AIM-47 missile into AWC-9 fire control radar system and AIM-54 "Undead Bird" missile, and equipped it with F- 14 "Tomcat" fighter to defend the US Navy aircraft carrier formation from Soviet supersonic bombers.

Rb- 12 is another production model of YF- 12 originally planned, but it has not been developed so far. This kind of aircraft is called Rb- 12 because it has modified the weapon compartment inside the fuselage of A- 12 and set up a rotary dropping device, which can carry four small nuclear bombs of 180 kg class and has reconnaissance capability. In addition, YF- 12 has a pure bomber B- 12 scheme. The above two schemes only stay on the plan and have not been developed. However, the B- 12 scheme was later used in the RS-7 1 (company name is RS- 12) plan.

From RS- 12 to SR-7 1

When the A- 12 development plan was implemented, the skunk factory proposed a reconnaissance/bombing scheme Rb- 12 to the US Air Force. When A- 12 started the flight test, Lockheed was making models of RS- 12 and B- 12. RS- 12 is an enlarged version of A- 12. It is a reconnaissance/attack aircraft that can not only carry out reconnaissance missions, but also carry out nuclear attacks, and its development plan eventually died halfway. In the numbering, R stands for territory and S stands for SmithKline. R- 12 is a special reconnaissance model, which is a two-seat enlarged version of A- 12. Successfully entered the real machine development stage, and finally R- 12 produced 3 1 as SR-7 1. Then, why did R- 12 become Sr-7 1? Originally, while Lockheed put forward two schemes of RS- 12 and R- 12, Rockwell Company put forward the scheme of RS-70 reconnaissance/attack aircraft based on B-70 Valkyrie bomber to compete. So although Lockheed's two schemes are called RS- 12 and R- 12 in our company, they are called RS-7 1 and R-7 1 in the outside world.

In fact, the developed reconnaissance plane is neither called RS-7 1 nor R-7 1, but called SR-7 1. The reason is exactly the same as President Johnson's name A- 12 A-LL, and Sr-7L was also announced by himself. 1On July 25th, 964, Johnson made a speech, revealing that Lockheed was developing a second military aircraft with the speed of three times the speed of sound, numbered SR-7L, which was an advanced long-range strategic reconnaissance aircraft and could be used worldwide.

The president's speech did not hide the actual military number of SR-7 1, but at this time, SR has no intention of attacking or reconnaissance, and its meaning has become strategic reconnaissance.

1In June 1962, the US Air Force conducted a model review of R/RS-7 1, and signed a contract to manufacture six testing machines on February 6 of the same year. Finally, the reconnaissance attack RS-7 1 was changed to strategic reconnaissance SR-7 1A, 29 were built by * *, and 2 were built by coach SB-71B. In addition, a SR-7 1C was modified with components of YF- 12A L and ground testing machine. A total of 32 SB-7 1 models were manufactured.

Sr-7 1A is a strategic reconnaissance aircraft developed from YF- 12, and it is also the most produced aircraft in the Blackbird family. The machine was developed in February of 1963. 1964 No.65438+1On October 29th, the oil well was delivered to Pamdale factory in California, which was responsible for testing. After completing the ground test, it made its first flight at 65438 on February 22 of the same year. 1964,1On February 7, 1964, the US Air Force decided to provide Bill Air Force Base in California for the SR-7L strategic reconnaissance plane and form the 4420th strategic reconnaissance plane wing. This wing is the predecessor of the 9 th Strategic Reconnaissance Wing of the US Air Force. 1965 SR-7 1 passed the appraisal of the US Air Force Strategic Command and was delivered to the 9th Strategic Reconnaissance Wing on19665438+10.

Compared with A-/KOOC-0/2 and YF-/KOOC-0/2A, the wingspan, height and wing area of SR-7/KOOC-0/0A are the same as those of A-/KOOC-0/2 and YF-/KOOC-0/2A, but the fuselage is lengthened to 32.74m .. The fuel load in the aircraft increases, and the flight weight and range also increase. Airborne equipment includes simple battlefield reconnaissance equipment, high-performance detection device for intrusion reconnaissance, and strategic reconnaissance system with an area of 6.5438+0.55 million square kilometers/hour.

By September 1967, all 29 SR-7 1A were tested successfully. On March 8th, 1968, the first SR-7 1A (No.64- 17978) was deployed to kadena air force base, Okinawa, to replace A- 12 for strategic reconnaissance. Two weeks later, Sr-7 1A began its reconnaissance mission to Viet Nam and China. 1990 65438+1October 2 1, and the last SR-7 1 (No.64- 17962) stationed in Kadena left the base and returned to the United States. 1990 65438+1On October 26th, the mission of SR-7 1A came to an end, and all aircraft were retired. Sr-7 1B is a tandem two-seat coach type of SR-7 1A, and the rear cockpit is a teacher's cabin, which is higher than the front cockpit, so that the front and rear occupants can have a better view. Under the nacelle of the engine, two fixed ventral fins were modified. This model * * * produced two aircraft, which were first flown in June 1965, June 18, June18, and delivered in June 1966 for training SR-7658. 1 96865438+1October1day, No.2 aircraft of SR-7 1B crashed due to a flight accident, and the remaining1aircraft later became 83/kloc-0 of NASA.

Sr-7 1C is a modified coach model, only one is made. Due to the accident of No.2 aircraft of SR-7 1B, the L-type aircraft of YF- 12A was modified into this coach type according to the needs of the Air Force.

Of the 29 SR-7 1A aircraft, one has a slightly modified tail, namely SR-7LA (BT). Some people call it "big tail" because the size of the tail beam increases. The main consideration of adopting this big tail beam design is to add improved sensors and other equipment to the aircraft. The aircraft made its first flight on1October 29th, 1976.

Re-service and retirement

Sr-7 1A also has a re-service type. 1990 65438+1October 25th, after all the Sr-7 1A were retired, except a few of them were sealed, most of them flew directly to permanent destinations-large museums or parks, which were famous masterpieces for tourists to watch. However, in 1994, the US Congress approved Sr-7 1 for re-service. 1On June 28th, 1995, two refurbished SR-7 1A were put into service again, which is the so-called re-service type. The main content of these two kinds of aircraft is to strengthen the airframe structure, and then equip them with advanced airborne equipment, such as the first generation of new synthetic aperture radar ASARS-L, technical research target camera TEOC, high-definition optical fiber camera, electronic information system and data transmission device. The aircraft 1 put into service again was NASA832 832,65438+1June 28th, 995, and it was the first to resume active service. On August 28th, 1995, the test flight of No.2 aircraft, which will be put into service again, began. 1997 65438+ 10/month 1, the air force submitted a request report to put two aircraft in the mission state.

Just as the US Air Force is preparing to use the retired SR-7LA for training and mission, the US government has not approved the use of SR-7 1A in the US defense budget for fiscal year 1998. As a result, the two SR-7 1A re-service models currently used by the 2nd Division of the 9th Strategic Reconnaissance Wing of the US Air Force will be retired once they are not used.

The high operating cost of SB-7 1 is one of the main reasons for its retirement, although even some members of Congress think that it is still a strategic reconnaissance plane that cannot be replaced by other aircraft. According to the mission readiness demand report submitted by the US Air Force, the monthly cost of re-service of two SR-7 1A is 30 days per month, and the budget is 39 million US dollars. Moreover, the US Air Force also plans to modernize it, such as improving its reconnaissance equipment and radar system and equipping it with satellite global positioning system, which require huge investment, so the US Congress has never approved these investment plans. From this perspective, the "Blackbird" that came out in the 1960s is coming to the end of its life. However, even if SR-7 1 is completely retired, it has now become the "blackbird" of NASA's flight testing machine, and will still serve in the scientific research front for an extended period of time.

basic document

Crew: 1 or 2

Total length: 107 ft 5 in (32.74m)

Span: 55ft 7in (16.94m)

Overall height: 18 ft 6 in (5.64m)

Wing area: 1 0,800 square feet (170 square meters)

Empty weight: 67,500 pounds (30,600 kilograms)

Load:170,000 lbs (77,000 kg)

Maximum takeoff weight: 172000 lbs (78000 kg)

Engine: two Pratt & Whitney J58- 1 turbojet engines, which can run continuously with afterburner, with a thrust of 32,500 lbs (144.57 kn).

Landing gear width: 16 ft 8 in (5.08m)

Landing gear fore-and-aft distance: 37 feet 10 inch (11.53m).

perform

Top speed: Mach 3.35 is at an altitude of 80,000 feet (24,285 meters), which is equivalent to 2 193 knots (or 2,522 miles per hour or 4,062 kilometers per hour).

Operational radius: 2900 Li (5400 km)

Transit voyage: 3,200 Li (5,926.4 km)

Service limit: 85,000 feet (25,900 meters).

Maximum upper limit: 100000 feet (30500m)

Maximum climb rate: greater than 60m/s.

Wing loading: 94 pounds per square foot (460 kilograms per square meter)

Thrust-weight ratio: 0.382: 1