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Through this screen you can estimate the working capacity and the working times of the extraction system with tractor with trailer, according to the operating conditions of the plot in question. You can access to the calculation procedure through the Scrolling menu of the forestry management, selecting the seventh item, or "Extraction with tractor and trailer."
The calculation of working capacity and the working times are based on bibliographic data related to productivity in each phase of the extraction ( loading and unloading of the trailer), the speed of load and unload tractor in different traffic situations and the average load of the trailer.
 extraction with tractor and trailer
The calculation procedure requires you to enter the following parameters for the calculation of the working time and the working capacity.
Parameters:
| • | Timber volume: expressed in m3, you can choose values between 10 and 300 (with intervals of 10 units). |
| • | Average tree volume: expressed in m3, you can choose values between 1 and 10 (with intervals of 1 unit). |
| • | Average extraction distances off the striproad: in meters, you can choose values between 25 and 500 (with intervals of 25 units). |
| • | Average extraction distances on the striproad: in meters, you can choose values between 50 and 1000 (with intervals of 50 units). |
| • | Extraction distances on the forestry road: in meters, you can choose values between 50 and 500 (with intervals of 50 units). |
| • | Method used for unloading: how to unload the trailer, you can choose between Rear dump and Yarder. |
| • | Method used for loading: how to load the trailer, you can choose between: |
| ► | large log, loaded alongside the lenght of the trailer; |
| ► | small log, loaded alongside the lenght of the trailer; |
| ► | large log, loaded alongside the width of the trailer; |
| ► | small log, loaded alongside the width of the trailer; |
| • | Trailer type: you can choose among an axle trailer or trailer with two axles, depending on what you use. |
| • | Wood Stacking: concentration of the timber, you can choose between: |
| ► | direct haulage (more than 5 loading points); |
| ► | partially extracted (between 2 and 5 loading points). |
The possibility to calculate the working time and the working capacity through the button  is activated only when all required parameters are entered. otherwise it is shown on the screen to insert the missing data.
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