This study continues to build upon the database of average time consumption and productivity models of forwarder machines in mechanised CTL operations in South African pine sawtimber plantations.

The aim of this study was to calculate the time consumption, productivity, and fuel consumption of two models of Ponsse forwarders (15-t and 20-t capacity) to compare the effects of multiple variables including machine capabilities, product assortment, load size, and extraction distance.

From these results it was possible to quantify and examine the effects of varying dimensions of products on forwarder payload limits and fuel consumption, and observe which products should result in highest productivity rates per machine.