Helicopter saw

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As Hubschraubersäge (also Helikoptersäge a vertical or horizontal circular saw is called) denotes that of a helicopter mounted by means of supporting tube and for the cutting free of overhead lines , cable cars is and railway catenaries used in wooded routes.

Description vertical saw

The helicopter saw consists of a tank, drive and working unit and the multi-part support tube. The working length of the system suspension attached to the helicopter is usually around 40 meters and can be adjusted depending on the application. The entire system is operated by the pilot. Inside the pipe there is a control cable that can be used to operate the saw from the cockpit, as well as a wire rope that would hold the saw in the event of a pipe break.

The tank volume is designed for the range of the helicopter. The fuel used is premium gasoline with two-stroke oil in a ratio of 1:50.

The drive unit consists of air-cooled two-cylinder two - stroke engines with a continuous output between about 45 HP (33 kW) and 60 HP (44 kW), which drives the vertical saw, which is equipped with 10 carbide saw discs, via a gearbox and shafts . Each circular saw blade has a diameter of around 55 cm and rotates at an operating speed of approx. 2000 / min. With this, branches up to a diameter of around 25 centimeters can be cut. The unit has a total weight of around 450 kilograms.

Description horizontal saw

In contrast to the vertical saw, the drive unit is equipped with a less powerful motor. Tree tops are cut with the horizontal saw hanging on the helicopter. The power generated by the engine is transmitted via a centrifugal clutch and belt to two counter-rotating circular saw blades with a diameter of around one meter. Trunks with a diameter of around 20 centimeters can be sawed off.

commitment

The helicopter used has a transparent bulge on the side; The pilot can observe the sawing process through this special door. During the entire working time of the helicopter saw, a coordinator is on the ground in radio contact with the pilot. It informs the pilot about possible danger spots and gives information about the distance of the saw to the ground or obstacles. The traffic safety obligations are defined together with the train operator.

Applications

  • Power lines of all voltage ranges
  • Routes of gondolas, chairlifts and ski lifts
  • Railway overhead lines
  • Pipeline routes for the oil and gas supply industry
  • Public and private roads
  • Paths and forest aisles
  • Crown pruning as additional forest fire prophylaxis

swell

  • EVU-Betriebsspraxis, route maintenance work with the helicopter saw, edition 7–8 / 1999, pp. 18–25
  • Helicopter Special, fine cut HELIMATIC - saw for aerial work by helicopter, edition 9/2001, pp. 12–13
  • das magazin, customer magazine of EnBW Energie Baden-Württemberg, quick cut for free routes, issue 01/2005, pp. 26-29

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