The tail assembly of the helicopter
The tail unit consisting of horizontal (stabilizer) and single-fin vertical or dvuhkilevoe must meet the requirements of strength, stiffness and fatigue. Load (voltage) should be determined by measurement during flight tests.
Stabilizer works similarly to the wing. The bending moment exerted on it, as well as in the wing spar is seen passing through the tail boom, and is therefore not transmitted to the fuselage.
In the process of calculating the longitudinal balance of the helicopter with the maximum front and rear alignment solve the problem of a rational change in flight or on the ground alignment stabilizer. If necessary, change the angle of attack of the stabilizer in flight it is mounted on two bearing assemblies disposed on the power components of the frame of the tail boom. In the plane on the axis of the beam stabilizer spar mounted lever with which the rotation of the stabilizer brackets.
If sufficient for balancing helicopter several fixed flight angle of attack of the stabilizer, the locations of its fastening to the tail boom spar stabilizer mounted on sliding hinge joints. The installation angle of the stabilizer is fixed rigid rod with a threaded couple. Thus, while the ground before the flight is achieved and secured the necessary installation angle of the stabilizer. This problem can be solved by changing the camber of the stabilizer by a fixed deviation of its tail.
Kiel single-rotor helicopter is a cantilever beam entrained tail boom twisting and bending. By Arrangement reasons he performed swept. Power circuit keel is different from the power circuit of the stabilizer.
At the top of the keel of the majority of helicopters set the gear unit PB. The keel beam PB passes shaft. For its installation and control of the main circuit keel beam is necessary to provide the hatches and removable panels. For this reason, power scheme runs the keel spar (single-spar to the rear wall or dvuhlonzheronnoe). Joining the keel beam for power elements of the tail boom like docking wing center section.
If the shaft RV for layout considerations may be placed in the bow keel, the nose portion is in the form of a fairing of the keel and the power circuit is performed caisson type.
Plumage coaxial helicopter, consisting of horizontal (stabilizer and elevator) and vertical (two keel with rudders), intended to improve the characteristics of longitudinal and directional stability and directional control of the helicopter with the help of rudders on the flight modes with forward speed. The efficiency rudders increases with the speed of horizontal flight. To obtain high performance directional stability on flight regimes translational velocity keels vertical fin set at an angle to the longitudinal axis of the helicopter, tails outwards.
The elevator is installed on the horizontal stabilizer control. It is fixed to the ground at an angle determined by the condition of a satisfactory balancing of data on all modes of flight, including autorotation.
All the above principles of KSS console cantilever wing are fully applicable to the design of the stabilizer and fin.
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