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Chapter 054 Golden Sparkle vs American Eagle

F-15Fighter, codename/nickname: Eagle, translation: Eagle.

Also known as McDonnell Douglas F-15 Eagle, translation: McDonnell Douglas F-15 "Eagle", nickname: American Eagle, is a fourth-generation supersonic jet fighter of the U.S. Air Force.

Because the F-15 fighter jet adopts a tandem two-seat swept-wing aerodynamic layout and is equipped with two turbofan engines, it has high maneuverability and combat capabilities, so the aircraft can be recognized at a glance when encountering it.

The F-15 fighter jet has complete all-weather combat capabilities, can use advanced medium-range air-to-air missiles to destroy enemy aircraft, and mainly performs air superiority combat missions.

After the F-15 fighter jets gained air supremacy, the F-15 fighter jets were often assigned to air-to-ground combat support missions, so air-to-ground combat modifications were developed in the later stages.

"Is this food edible? Is it delicious?"

Jin Shanshan also noticed the F-15D flashing past on the ual screen, and asked curiously.

Hearing Jin Shining's words, Zhou Wenwen was stunned for a moment, and when he was about to say, "This thing tastes so good when it's mostly plastic," Zhou Wenwen carefully recalled the information about the F-15, and then said with a strange expression.

"It's edible, and I guess it's delicious."

If Zhou Wenwen remembers correctly, like many fighter jets, the F-15 fighter fuselage has an all-metal semi-monocoque structure, and the fuselage is composed of front, middle and rear sections.

The front section includes the head radome, cockpit and electronic equipment compartment. The main structural materials are aluminum alloy and composite metal.

The middle section is connected to the wing, and some titanium alloy parts are used to bear large loads, accounting for about 20.4% of the weight of this section. The first three frames are aluminum alloy structures, and the last three frames are titanium alloy structures.

The rear section is a titanium alloy structure engine nacelle, and the zigzag leading edge of the horizontal tail is a full-motion horizontal tail with a large area that can meet the needs of high-speed flight and maneuvering.

The F-15 wing design adopts a tapered delta wing shape, which can improve the wing structure and increase the internal volume of the aircraft. At the same time, it can make the increase in drag of the aircraft in the transonic speed zone more gentle, and the focus movement of the aircraft at transonic speeds is also smaller. Small, reducing the trim resistance.

In order to improve the subsonic performance of the aircraft and take into account weight, manufacturing process and system complexity, the F-15 adopts a no-front and rear-edge maneuverable flaps and a leading-edge fixed conical torsion design. The leading edge is swept back 45 degrees, and the relative thickness of the wing is 6%/3% (wing root/wing tip), instead of using the leading edge maneuverable flaps that had been widely used at that time.

The F-15 wing adopts an aspect ratio of up to 3, combined with a root-to-tip ratio of 5, which helps delay wing tip separation and significantly reduces wing-induced drag.

The larger aspect ratio increases the slope of the wing's lift line and improves the wing's lift characteristics.

At the same time, the aspect ratio increases, and the supersonic zero-lift drag coefficient also increases, increasing the trans/supersonic wave resistance.

This shortcoming is made up for by powerful engine thrust and other aspects of design.

The wing area is 56.48 square meters, the dihedral angle is 1°, and the installation angle is 0°. There are only four control surfaces on the wing: trailing edge high-lift flaps and ailerons.

The F-15 wing structure is a multi-beam torsion box type damage safety structure. The front beam is made of aluminum alloy, and the rear three beams are made of titanium alloy. The lower skin of the inner integral fuel tank is made of titanium alloy wall plates, and the rest is machined aluminum alloy integral wall plates.

The front and rear edges of the wing, flaps, and ailerons are all aluminum honeycomb sandwich structures. The damage safety structure of the wing, combined with the load-bearing skin, can support the aircraft to continue flying as long as one wing spar is still intact, greatly improving the aircraft's survivability.

The F-15 vertical stabilizer and tail are honeycomb wall panel skins composed of boron fiber composite materials, titanium alloy torsion boxes, full-thickness aluminum sandwich cores, and boron-epoxy composite panels, with a sandwich structure. The torsion box of both is a titanium alloy structure, and the front and rear edges are an all-aluminum honeycomb structure.

The rudder uses carbon fiber-epoxy composite beam ribs and boron-epoxy panels and aluminum sandwich skins. Both the horizontal tail and rudder are interchangeable left and right.

The vertical tail adopts a large aspect ratio and medium sweep angle design. The leading edge sweep angle is 37°, the camber is 2°, and the height is large. It can significantly improve the aircraft's directional stability at large angles of attack, thereby ensuring that the F-15 can Effectively perform high angle of attack maneuvers.

The horizontal tail is a large sweep full-motion low horizontal tail design, with a leading edge sweep angle of 50°, a leading edge serration and a wingtip bevel design.

In order to provide a good view, the pilot cockpit uses an integral windshield, and the seat position is also arranged high. Almost 1/3 of the pilot's body is exposed outside the fuselage, allowing the pilot to have a 360-degree surrounding view of the upper hemisphere, and the downward viewing angle reaches 15 °.

There is a protruding fairing on the outside of the inlet, extending forward from the leading edge of the wing root. It can generate vortices at large angles of attack, delay wing stall and improve tail efficiency. It is equivalent to a slat wing, but due to the leading edge of the fairing The radius is larger, the suction is larger, and the airflow is not easy to separate. Its effect is not as good as the edge wing.

The fairing structure extends backward through the wing to form a tail support truss (tail brace) structure. In addition to providing space for the installation of the tail wing, it can also generate a certain bowing moment at high angles of attack, improving the aircraft's performance at high angles of attack.

The F-15 fighter's single speed brake is located on the back of the fuselage, with a maximum opening of 35°. It can be opened at any speed without changing the pitch attitude of the aircraft.

The tail of the F-15 adopts a twin-engine layout with a small spacing, which reduces the drag of the aircraft.

F-15战斗机早期装两台普·惠公司F100-PW-100涡扇发动机，1991年后换装推力为129千牛/级的F110-GE-129或F100-PW-229涡扇发动机。

普拉特.惠特尼研制的F100-PW-100发动机单台静推力65.2千牛，加力推力高达11340千克，为F-15的优越性能提供了坚实的基础。

This is an axial flow turbofan engine with a bypass ratio of 0.7, a dual-shaft 3-stage fan + a 10-stage high-pressure compressor + a 2-stage turbine.

The engine design is quite advanced, with a thrust-to-weight ratio of 7.8. It can be installed interchangeably on the left and right sides. It only takes 20 minutes to disassemble under ideal conditions.

Low-drag conformal fuel tanks (CFT) are specially developed for the C/D type. They are installed outside the air inlets on both sides and under the main wings. They can load about 3200 liters of fuel. This device allows the F-15 to Reducing the time required for aerial refueling, thereby increasing the time it can perform missions on the battlefield, will facilitate its global deployment operations.

The F-15 fighter jet has six underwing hardpoints, four hardpoints on the outside of the fuselage, and one hardpoint on the centerline of the fuselage. The total external stores can reach 7300 kilograms.

F-15的主要武器是AIM-7空空导弹、AIM-9空空导弹和AIM-120空空导弹等，其中进气道下方外侧可以挂载AIM-7和AIM-120，机翼下的多功能挂架可以挂载AIM-9和AIM-120。

It can also carry various U.S. Air Force aerial bombs, including free-fall nuclear bombs and 2000-kilogram GBU-28 bunker-penetrating bombs.

The auxiliary weapon is an M61A1 Vulcan cannon installed outside the right inlet.

The F-15 is equipped with an automated weapon system and a Hands On Throttle And Stick (HOTAS) design, which allows pilots to effectively conduct air combat simply by using the buttons on the throttle stick and joystick.

......

To be continued

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Chapter 055 Preview of Level Maintenance Ability