Ultra light Helicopter AK1-3(5)

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The cockpit’s floor is a load-bearing element in itself, holding on it: pilots’ seats, controls, control panel; and under it, elements of the control system for the rotor and the anti-torque rotor, elements of electric system, heating and ventilating systems.
The cockpit’s glass paneling provides f good field of vision ahead, ahead down, left, right, and up.
The crew seats are not adjustable, since the field of vision is good in any position. The seats are also equipped with safety belts. Shoulder and lap belts are designed for reliable fixation of crew members during all stages of the flight.

 
 1.Door 4.Control panel
2.Seat 5.Floor
3.Glass paneling 6.Cowl
 
Figure 4.3 COCKPIT
 
 
4.5. TAIL BOOM 
The tail boom (Fig. 4.3) is a cylindrical riveted construction made out of plate. 

 
 
1. Pipe    5. Fork
2. Light indication  6. Frame
3. Hatch    7. Support fork
4. Strut fork
 
Figure 4.4. TAIL BOOM
 
The tail boom holds:
- helicopter’s light indication;
- four hatches (to access the main units of the tail boom);
- strut fork (the strut keeps the tail boom horizontal);
- fork attaching the tail boom to the V-belt drive;
- nine frames (for main units of the rotor control, and also as a wireframe for the pipe);
- fork for support and attachment of stabilizer.
The helicopter’s stabilizer provides the necessary characteristics of directional stability and controllability in the main flight regimes for saving the necessary resources of directional control. The vertical empennage provides for yaw stability and relieves the rotor at high speeds.
 
4.6. UNDERCARRIAGE
The helicopter’s undercarriage (Fig.4.5.) are skid-equipped.
 

 
1. Skids
2. Tubular spring
3. Rolling device fitting point
4.  Footboard
 
Figure 4.5. UNDERCARRIAGE
 
 
 
 
 
The skids are made of jointless pipes.
For softening the impact during incorrect landing, the helicopter is equipped with springs made of bent pipes. The skids are equipped with holders for the detachable rolling device for land transportation of the helicopter within airports or hangars.
  To make getting into the cockpit more comfortable, the footboards are attached to the fore springs.
 
4.7. ROTOR
The rotor (Fig. 4.6.) moves the helicopter. 
There are three blades of rectangular shape made of composite materials with nonlinear twist and variable in width symmetric profile.
The blades are torsion-attached. Steel detail package VNS-2 serves as a torsion bar.
 

 
1. Torsion bar
2. Blade
 
Figure 4.6. ROTOR
 
 
 
 
 
 
 
 
 
 
 
 
Torsion rotor hub (Pic 4.7.) successfully solves the problem of reliability of the blade fitting point, is easily manufactured, requires no service, and has a good weight characteristic. The hub details are corrosive-resistant.
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1.рукав  в сборе     6. Штырь
2. Тарелка нижняя     7. диск
3. Тарелка верхняя     8.сфера
4. Корпус      9. ось
5. Ось       10. болт
11. пружина
 
Pic 4.7. Torsion rotor hub 
 
 
3

2

1

6

4

9

11

5

7

10

8

 
 
 

 

 
1. Casing     8. Body
2. Ear 9. Bolt
3. Hub 10. Plate
4. Nut 11. Hub
5. Fork 12. Rest
6. Torsion bar 13. Plate
7. Torsion bar fork
 
Pic.4.8. ARM
 
4.8. ANTI-TORQUE ROTOR
The two-blade anti-torque rotor serves as a balance for the reactionary torque of the rotor and provides controllability. It is attached to a generic horizontal joint. The blades are made of composite materials.
　
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