Coaxial twin-rotor helicopter

Abstract

The invention discloses a coaxial twin-rotor helicopter, comprising a frame, on which a rotor adjustment device, a transmission belt tensioning structure and a tail structure are arranged; a first connecting rod is connected to the upper ends of two transmission shafts, each transmission shaft is arranged in an inner shaft, two guide plates are arranged at the upper end of the inner shaft, the first connecting rod is located between the two guide plates and is movably connected with the guide plates, the outer end of each lower rotor hub is provided with a lower rotor blade, the inner end of each lower rotor hub is rotatably connected to a second positioning seat through a second connecting plate, each second connecting plate is connected to the second connecting rod through each lower pitch rocker arm, the second positioning seat is located between each lower pitch rocker arm, each lower pitch rocker arm is connected to the lower end of a stabilizing arm through each cross bar, and the upper end of the stabilizing arm is connected to the second positioning seat; the invention prevents the helicopter from spinning while avoiding the complicated structure caused by the device for changing the rotation speed by differential speed, and has the beneficial effects of simple structure, not easy to damage and easy operation.

Description

Technical Field

[0001] The invention relates to a coaxial twin-rotor helicopter. Background Art

[0002] Helicopters can perform low-altitude, low-speed and unchanging nose direction maneuvering flight, especially vertical takeoff and landing in a small area. Due to these characteristics, it has broad uses and development prospects. It can be applied to short-distance transportation, medical rescue, disaster relief, emergency rescue, hoisting equipment, geological exploration, forest fire fighting, aerial photography, etc. Existing civil single-rotor helicopters with tail rotors require a tail rotor with balanced torque, and the structure is complex and difficult to operate. The common tail steering axis is perpendicular to the ground, and the tail swings left and right. By swinging left and right during driving, the airflow is guided to achieve steering. However, there is a problem with this type of helicopter that the airflow it guides can only be horizontal airflow, that is, the helicopter can only achieve steering during driving. When the helicopter is hovering, most of the airflow flows from top to bottom, and the left and right swinging tail cannot change the steering. To achieve steering during hovering, the rotation speed of the upper and lower rotors must be changed, and different balanced torques are used to achieve it. This method adds a device for changing the speed of the differential speed, resulting in a complex structure, and the operation of changing the speed is complicated and requires a lot of operating experience.

[0003] Therefore those skilled in the art are committed to developing a coaxial twin-rotor helicopter with simple structure and easy operation. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a coaxial twin-rotor helicopter, comprising a frame, on which a rotor adjustment device, a transmission belt tensioning structure and a tail structure are arranged;

[0005] The camming mechanism is a complex two-dimensional structure, and the two cams are connected by a threaded cane to form a pair of camshafts, each of which is connected by a threaded cane to form a pair of camshafts that are connected by a threaded cane. The camshafts are connected by a threaded cane to form a pair of camshafts that are connected by a threaded cane. The camshafts are connected by a threaded cane to form a pair of camshafts that are connected by a threaded cane. The hub, the outer end of each lower rotor hub is provided with a lower rotor blade, the inner end of each lower rotor hub is rotatably connected to the second positioning seat through a second connecting piece, each second connecting piece is connected to the cross bar through each lower pitch rocker arm, the second positioning seat is located between each lower pitch rocker arm, each cross bar is connected to the lower end of the stabilizing arm, and the upper end of the stabilizing arm is connected to the second positioning seat; the cross bar is connected to the first inclined plate, the first inclined plate is sleeved on the outer shaft, a second inclined plate sleeved on the outer shaft is provided below the first inclined plate, four movable rods are provided on the second inclined plate, each movable rod is connected to the second inclined plate through a connecting piece, a positioning plate is provided below the second inclined plate, and two limiting units used in conjunction with the movable rod are provided on the positioning plate; an operating group is provided below the transmission machine, and each movable rod is connected to an operating rod transmission shaft through the operating group;

[0006] An engine is arranged on the frame, and the engine is connected to the transmission machine through a transmission belt tensioning structure;

[0007] The rear end of the frame is provided with an inclined tail structure, which includes tails arranged on both sides of the frame, and adjustment rods for adjusting the tails are respectively arranged between the tails, and the adjustment rods are connected to the steering pedals of the cockpit through the tail lifting and retracting rods.

[0008] Preferably, one end of each of the upper rotor hubs and each of the lower rotor hubs is provided with a mounting groove, and one end of each of the upper rotor blades and each of the lower rotor blades is located in each mounting groove and is detachably connected by bolts.

[0009] Preferably, a limiting unit is provided between each two adjacent movable rods, each limiting unit comprises an extension rod, one end of the extension rod is connected to the positioning plate, and the other end of the extension rod is provided with two limiting rods for limiting the movable rod, and the transmission machine is located directly below the positioning plate.

[0010] Preferably, the transmission belt tensioning structure comprises a belt, the output shaft of the engine is connected to an outer transmission wheel via the belt, and the outer transmission wheel is connected to the transmission machine;

[0011] The frame is provided with a fixed wheel and a telescopic wheel, and the belt is located between the fixed wheel and the telescopic wheel.

[0012] Preferably, a rectangular frame is provided on the frame, both ends of the fixed wheel are rotatably connected to the rectangular frame, both ends of the telescopic wheel are connected to the front half of each adjustment plate, the middle section of each adjustment plate is connected through a connecting plate, the rear half of each adjustment plate is rotatably connected to the rectangular frame, and the adjustment plates are connected through a cylinder provided on the frame.

[0013] Preferably, the cockpit is provided with a joystick, a pitch lever, a steering pedal, a switch, a navigation screen and an instrument panel;

[0014] The joystick is connected to the operating lever transmission shaft and is used to link the rotor adjustment device and swing forward, backward, left and right to control the horizontal movement of the helicopter;

[0015] The pitch lever is used to link the rotor adjustment device, and pulling it upward can increase the pitch and improve the lift;

[0016] The steering pedal is used to link the tail wing, wherein the steering pedal includes a left pedal and a right pedal. When the left pedal is pressed, the transmission rope in the telescopic rod of the tail wing is loosened, and the telescopic rod extends and rotates to the left; when the right pedal is pressed, the transmission rope in the telescopic rod of the tail wing is tightened, and the telescopic rod shrinks and rotates to the right.

[0017] The switch is linked to the transmission belt tensioning structure to control the movement of the telescopic wheel;

[0018] The navigation screen and the instrument panel are used to display navigation information and flight parameters.

[0019] Preferably, an adjustment opening is provided along the height direction of each guide piece, and each first connecting rod cooperates with the adjustment opening and is movably connected to the guide piece via a displacement rod.

[0020] Preferably, the operating group includes an operating panel, and four first connecting arms are provided on the outer edge of the operating panel, each of the connecting arms is connected to four movable rods respectively, and a second connecting arm connected to the operating panel is provided between each two adjacent first connecting arms, and an operating rod transmission shaft is provided on each second connecting arm, and each operating rod transmission shaft is connected to the operating panel through each connecting arm.

[0021] The beneficial effects of the present invention are as follows: compared with a single-rotor helicopter with a tail rotor, the coaxial twin-rotor helicopter of the present invention is characterized in that the torque is balanced by the reversal of the upper and lower rotors, that is, the upper rotor rotates clockwise at a top-down angle, and the lower rotor rotates counterclockwise at a top-down angle, and the rotation speeds are the same, so the torque can be balanced and the helicopter can be prevented from spinning. At the same time, the device for changing the rotation speed by differential speed causes a complex structure, and has the beneficial effects of simple structure, not easy to be damaged, and easy to operate.

[0022] Therefore those skilled in the art are committed to developing a coaxial twin-rotor helicopter with simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the second three-dimensional structure of the present invention.

[0025] Figure 3 It is a schematic diagram of the connection structure of the upper rotor control structure and the lower rotor control structure and other parts in the present invention.

[0026] Figure 4 yes Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0027] Figure 5 It is a structural schematic diagram of the upper rotor control structure and other parts in the present invention.

[0028] Figure 6 It is a structural schematic diagram of the lower rotor control structure and other parts in the present invention.

[0029] Figure 7 yes Figure 6 Schematic diagram of the local enlarged structure at point B in the middle.

[0030] Figure 8 It is a schematic diagram of the connection structure between the transmission belt tensioning structure and the transmission machine and other components. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0032] like Figures 1 to 8 As shown, a coaxial twin-rotor helicopter comprises a frame 1 and a rotor adjustment device, wherein the rotor adjustment device comprises an upper rotor control structure 2 and a lower rotor control structure 3;

[0033] The upper rotor control structure 2 comprises two upper rotor hubs 5, the outer end of each upper rotor hub 5 is provided with an upper rotor blade 6, the inner end of each upper rotor hub 5 is rotatably connected to a first positioning seat 7 through a first connecting piece 9, the first positioning seat 7 is sleeved on the inner shaft 8, each first connecting piece 9 is connected to a first connecting rod 11 through an upper pitch rocker arm 10, and the first positioning seat 7 is located between each upper pitch rocker arm 10;

[0034] Inner shaft: connected to the transmission machine, longer than the outer shaft, and runs through the inner part of the outer shaft, connected to the upper rotor control structure and the upper rotor hub, the inner shaft is hollow and passes through two transmission shafts 12, and the two connecting shafts simultaneously connect the upper and lower upper rotor control structures;

[0035] The first connecting rod 11 is connected to the upper ends of two transmission shafts 12, each of which is arranged in the inner shaft 8, and the upper end of the inner shaft 8 is provided with two guide pieces 13, the first connecting rod 11 is located between the two guide pieces 13 and is movably connected to the guide pieces 13, the lower end of the inner shaft 8 is connected to the transmission machine 15, and the lower half of the inner shaft 8 is sleeved with an outer shaft 16 connected to the transmission machine 15;

[0036] Outer shaft: connected to the transmission machine, with a hollow interior that runs through the inner shaft and is connected to the upper rotor part of the lower rotor control structure and the lower rotor hub.

[0037] Upper rotor control structure 2: The operating lever transmission shaft controls the tilting degree of the operating plate in the front, back, left, and right directions or the height of the lifting and lowering, and synchronously affects the tilting degree and height of the swash plate, so that the transmission structure drives the transmission shaft, causing the two transmission shafts to have a height difference or rise and fall synchronously, thereby affecting the upper rotor control structure;

[0038] Since the transmission shaft follows the position change of the lower part, it drives the first connecting rod 11 to tilt or lift. After the position of the first connecting rod 11 changes, it drives the upper pitch rocker arm 10 to lift, thereby driving the upper rotor hub to rotate and change the pitch of the blades, so that the helicopter can lift or move left and right, forward and backward.

[0039] The lower rotor control structure 3 includes a second positioning seat 17, which is sleeved on the lower half of the outer shaft 16. Lower rotor hubs 18 are provided on both sides of the second positioning seat 17. The outer ends of the lower rotor hubs 18 are provided with lower rotor blades 19. The inner ends of the lower rotor hubs 18 are rotatably connected to the second positioning seat 17 through second connecting pieces 20, respectively. The second connecting pieces 20 are connected to the cross bars 22 through the lower pitch rocker arms 21, respectively. The second positioning seat 17 is located between the lower pitch rocker arms 21, and each cross bar 22 is connected to the lower end of the stabilizing arm 23. The upper end of the stabilizing arm 23 is connected to the second positioning seat 17.

[0040] The cross bar 22 is connected to a first tilting plate 26, the first tilting plate 26 is sleeved on the outer shaft 16, a second tilting plate 27 sleeved on the outer shaft 16 is arranged below the first tilting plate 26, four movable rods 28 are arranged on the second tilting plate 27, each of the movable rods 28 is connected to the second tilting plate 27 through a connecting piece 33, a positioning plate 29 is arranged below the second tilting plate 27, and two limit units 30 used in conjunction with the movable rods 28 are arranged on the positioning plate 29;

[0041] The lower rotor control structure; the operating plate is tilted forward, backward, left, right, or raised and lowered, driving the transmission shaft to change, and the transmission shaft drives the second swash plate 27 to synchronously affect the inclination and height, and the rotating bearing is at the contact surface between the second swash plate 27 and the outer shaft;

[0042] The second swash plate 27 changes the inclination and height of the first swash plate 26. After the second swash plate 27 changes, it drives the pitch rocker arm to perform lifting and lowering movements, thereby driving the lower rotor hub to rotate and changing the pitch of the blades, so that the helicopter as a whole can be lifted or moved left and right, forward and backward; the rotating bearing is on the contact surface between the first swash plate 26 and the outer shaft; the stabilizing arm 23 and the lower pitch rocker arm 21 are connected by two connected spherical shafts to prevent the spherical shaft at the connection between the lower pitch rocker arm 21 and the first swash plate 26 from being offset during rotation.

[0043] An operating group 31 is provided below the conveyor 15, and each of the movable rods 28 is connected to an operating rod transmission shaft 32 through the operating group 31. The tilting degree of the operating panel in the front, back, left, and right directions or the height of the lifting and lowering are actively controlled.

[0044] One end of each of the upper rotor hubs 5 and each of the lower rotor hubs 18 is provided with a mounting groove 35, and one end of each of the upper rotor blades 6 and each of the lower rotor blades 19 is located in each of the mounting grooves 35 and is detachably connected by bolts.

[0045] A limiting unit 30 is arranged between each two adjacent movable rods 28, and each limiting unit 30 includes an extension rod 36, one end of which is connected to the positioning plate 29, and the other end of the extension rod 36 is provided with two limiting rods 37 for limiting the movable rod 28, and the conveyor 15 is located directly below the positioning plate 29.

[0046] An engine 38 is disposed on the frame 1 , and the engine 38 is connected to the transmission machine 15 via a transmission belt tensioning structure 39 .

[0047] The transmission belt tensioning structure 39 includes a belt 50, and the output shaft of the engine 38 is connected to an outer transmission wheel 51 through the belt 50, and the outer transmission wheel 51 is connected to the transmission machine 15;

[0048] The frame 1 is provided with a fixed wheel and a telescopic wheel, and the belt 50 is located between the fixed wheel and the telescopic wheel.

[0049] A rectangular frame 55 is provided on the frame 1, and both ends of the fixed wheel are rotatably connected to the rectangular frame 55, respectively. Both ends of the telescopic wheel are connected to the front half of each adjustment plate 56, and the middle section of each adjustment plate 56 is connected through a connecting plate 57. The rear half of each adjustment plate 56 is rotatably connected to the rectangular frame 55, and the adjustment plates 56 are connected through a cylinder provided on the frame 1.

[0050] A helicopter transmission belt tensioning structure 39 is used to transmit the power of the engine 38 to the outer transmission wheel 51 of the transmission machine through a tensioned belt 50;

[0051] Since the helicopter engine 38 needs to be preheated, the transmission wheel cannot be connected during preheating, so a transition from preheating to transmission is required;

[0052] The engine wheel is connected to the engine at the bottom to output power;

[0053] The outer transmission wheel is connected to the transmission machine and is also connected to the engine wheel through a belt; the grooves of the outer transmission wheel and the engine wheel are smooth, and the belt has teeth;

[0054] The fixed wheel is fixed to one side of the belt and cannot move, it can only roll;

[0055] The telescopic wheel, as the main component of the belt tensioning structure, when continuously moving inwards, the belt is tensioned, thereby realizing the transition from preheating to transmission.

[0056] The rear end of the frame 1 is provided with an inclined tail structure 58, which includes tails 59 arranged on both sides of the frame 1, and an adjustment rod 60 for adjusting each tail 59 is respectively provided between each tail 59, and the adjustment rod 60 is connected to the steering pedal of the cockpit 61 through the tail lifting and retracting rod.

[0057] The cockpit 61 is provided with a joystick, a pitch lever, a steering pedal, a switch, a navigation screen and an instrument panel;

[0058] The joystick is connected to the operating lever transmission shaft 32 and is used to link the rotor adjustment device and swing forward and backward and left and right to control the horizontal movement of the helicopter;

[0059] The pitch lever is used to link the rotor adjustment device, and pulling it upward can increase the pitch and improve the lift;

[0060] The steering pedal is used to link the tail wing, wherein the steering pedal includes a left pedal and a right pedal. When the left pedal is pressed, the transmission rope in the telescopic rod of the tail wing is loosened, and the telescopic rod extends and rotates to the left; when the right pedal is pressed, the transmission rope in the telescopic rod of the tail wing is tightened, and the telescopic rod shrinks and rotates to the right.

[0061] The switch is linked to the transmission belt tensioning structure to control the movement of the telescopic wheel;

[0062] The navigation screen and the instrument panel are used to display navigation information and flight parameters.

[0063] An adjustment opening 62 is provided along the height direction of each guide piece 13 , and each first connecting rod 11 cooperates with the adjustment opening 62 and is movably connected to the guide piece 13 via a displacement rod 63 .

[0064] Compared with a single-rotor helicopter with a tail rotor, the coaxial twin-rotor helicopter of the present invention relies on the reverse rotation of the upper and lower rotors to balance the torque, so the tail rotor required to balance the torque like the common single-rotor helicopter is no longer needed.

[0065] Therefore, the tail of a coaxial twin-rotor helicopter is mainly used to adjust the steering. The common tail steering axis is perpendicular to the ground, and the tail swings left and right. By swinging left and right during driving, the airflow is guided to achieve steering. However, there is a problem with this type of helicopter, which is that the airflow it guides can only be horizontal, that is, the helicopter can only achieve steering during driving. When the helicopter is hovering, most of the airflow flows from top to bottom, and the left and right swinging tail cannot change the steering. To achieve steering during hovering, the rotation speed of the upper and lower rotors must be changed, and different balancing torques are used to achieve this. This method adds a device for changing the speed at a differential speed, resulting in a complex structure, and the operation of changing the speed is complex and requires a lot of operating experience.

[0066] Therefore, this structure adopts a tilted tail structure design. The tail can guide the airflow from top to bottom when the helicopter is hovering, so that the helicopter can turn when hovering. The structure is simple and the operation is simple. At the same time, during driving, the direction of the airflow after converging is obliquely downward, so the tilted tail has a better diversion effect and a better steering effect.

[0067] The nose rotates to the left: the telescopic rod extends, driving the long side of the L-shaped connecting rod (adjusting rod 60) to move, driving the connecting rod to move, and driving the tail wing;

[0068] The nose rotates to the right: the telescopic rod contracts, driving the long side of the L-shaped connecting rod (adjusting rod 60) to move, driving the connecting rod to move, and driving the tail wing;

[0069] The telescopic rod is extended and retracted by the left and right pedals of the cockpit 61. When the left pedal is stepped on, the transmission rope in the telescopic rod is loosened, and the telescopic rod is extended; when the right pedal is stepped on, the transmission rope in the telescopic rod is tightened, and the telescopic rod is retracted.

[0070] The operating group 31 includes an operating panel 65, and four first connecting arms 66 are provided on the outer edge of the operating panel 65. Each connecting arm 66 is connected to four movable rods 28 respectively. A second connecting arm 67 connected to the operating panel 65 is provided between each adjacent two first connecting arms 66. An operating rod transmission shaft 32 is provided on each second connecting arm 67, and each operating rod transmission shaft 32 is connected to the operating panel 65 through each connecting arm 66.

[0071] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A coaxial twin-rotor helicopter, characterized in that: It comprises a frame (1), on which a rotor adjustment device, a transmission belt tensioning structure (39) and a tail structure (58) are arranged; The rotor adjustment device comprises an upper rotor control structure (2) and a lower rotor control structure (3); the upper rotor control structure (2) comprises two upper rotor hubs (5), the outer end of each upper rotor hub (5) is provided with an upper rotor blade (6), the inner end of each upper rotor hub (5) is rotatably connected to a first positioning seat (7) via a first connecting piece (9), the first positioning seat (7) is sleeved on the inner shaft (8), each first connecting piece (9) is connected to a first connecting rod (11) via an upper pitch rocker arm (10), and the first positioning seat (7) is located between each upper pitch rocker arm (10); the first connecting rod (11) is connected to the upper rotor hub (5) via a first connecting piece (9), and the first connecting piece (7) is connected to the upper rotor hub (5) via a first connecting piece (9). 1) connected to the upper ends of two transmission shafts (12), each of the transmission shafts (12) is arranged in an inner shaft (8), the upper end of the inner shaft (8) is provided with two guide pieces (13), the first connecting rod (11) is located between the two guide pieces (13) and is movably connected to the guide pieces (13), the lower end of the inner shaft (8) is connected to a transmission machine (15), the lower half of the inner shaft (8) is sleeved with an outer shaft (16) connected to the transmission machine (15); the lower half of the outer shaft (16) is sleeved with a second positioning seat (17), both sides of the second positioning seat (17) are provided with a lower rotor hub (18), each of the lower rotor hubs (1 8) are provided with lower rotor blades (19) at their outer ends, the inner ends of the lower rotor hubs (18) are rotatably connected to the second positioning seats (17) through the second connecting pieces (20), the second connecting pieces (20) are connected to the cross bars (22) through the lower pitch rocker arms (21), the second positioning seats (17) are located between the lower pitch rocker arms (21), the cross bars (22) are connected to the lower ends of the stabilizing arms (23), the upper ends of the stabilizing arms (23) are connected to the second positioning seats (17); the cross bars (22) are connected to the first slanting plates (26), the first slanting plates (26) are sleeved on the outer shaft (16), A second inclined plate (27) sleeved on the outer shaft (16) is arranged below the first inclined plate (26); four movable rods (28) are arranged on the second inclined plate (27); each movable rod (28) is connected to the second inclined plate (27) through a connecting piece (33); a positioning plate (29) is arranged below the second inclined plate (27); two limiting units (30) used in conjunction with the movable rods (28) are arranged on the positioning plate (29); an operating group (31) is arranged below the transmission machine (15); each movable rod (28) is connected to an operating rod transmission shaft (32) through the operating group (31); An engine (38) is arranged on the frame (1), and the engine (38) is connected to the transmission machine (15) via a transmission belt tensioning structure (39); The rear end of the frame (1) is provided with an inclined tail structure (58), the inclined tail structure (58) comprising tails (59) arranged on both sides of the frame (1), and adjustment rods (60) for adjusting the tails (59) are respectively arranged between the tails (59), and the adjustment rods (60) are connected to the steering pedal of the cockpit (61) through the tail extension rod; a limiting unit (30) is arranged between each two adjacent movable rods (28), and each limiting unit (30) comprises an extension rod (36), one end of the extension rod (36) is connected to the positioning plate (29), and the other end of the extension rod (36) is provided with two limiting rods (37) for limiting the movable rod (28), and the transmission machine (15) is located directly below the positioning plate (29); The transmission belt tensioning structure (39) comprises a belt (50), the output shaft of the engine (38) is connected to an outer transmission wheel (51) via the belt (50), and the outer transmission wheel (51) is connected to the transmission machine (15); The frame (1) is provided with a fixed wheel and a telescopic wheel, and the belt (50) is located between the fixed wheel and the telescopic wheel; The frame (1) is provided with a rectangular frame (55), the two ends of the fixed wheel are rotatably connected to the rectangular frame (55), the two ends of the telescopic wheel are connected to the front half of each adjustment plate (56), the middle section of each adjustment plate (56) is connected via a connecting plate (57), the rear half of each adjustment plate (56) is rotatably connected to the rectangular frame (55), and the adjustment plate (56) is connected via a cylinder provided on the frame (1); A joystick, a pitch lever, a steering pedal, a switch, a navigation screen and an instrument panel are arranged in the cockpit (61); The joystick is connected to the operating lever transmission shaft (32) and is used to link the rotor adjustment device to swing forward, backward, left and right to control the horizontal movement of the helicopter; The pitch lever is used to link the rotor adjustment device, and pulling it upward can increase the pitch and improve the lift; The steering pedal is used to link the tail wing, wherein the steering pedal includes a left pedal and a right pedal. When the left pedal is pressed, the transmission rope in the telescopic rod of the tail wing is loosened, and the telescopic rod is extended and rotated to the left. Step down the right pedal to tighten the transmission rope inside the telescopic rod of the tail wing, and the telescopic rod will shrink and rotate to the right; The switch is linked to the transmission belt tensioning structure to control the movement of the telescopic wheel; The navigation screen and the instrument panel are used to display navigation information and flight parameters.

2. The coaxial twin-rotor helicopter according to claim 1, characterized in that: One end of each of the upper rotor hubs (5) and each of the lower rotor hubs (18) is provided with a mounting groove (35), and one end of each of the upper rotor blades (6) and each of the lower rotor blades (19) is located in each of the mounting grooves (35) and is detachably connected by bolts.

3. The coaxial twin-rotor helicopter according to claim 2, characterized in that: An adjustment opening (62) is provided along the height direction of each guide piece (13), and each first connecting rod (11) cooperates with the adjustment opening (62) and is movably connected to the guide piece (13) via a displacement rod (63).

4. The coaxial twin-rotor helicopter according to claim 3, characterized in that: The operating group (31) comprises an operating panel (65), and four first connecting arms (66) are arranged on the outer edge of the operating panel (65), and each of the connecting arms (66) is connected to four movable rods (28) respectively; a second connecting arm (67) connected to the operating panel (65) is arranged between each two adjacent first connecting arms (66), and each second connecting arm (67) is provided with an operating rod transmission shaft (32), and each of the operating rod transmission shafts (32) is connected to the operating panel (65) through each of the connecting arms (66).

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