European harvesters and processors have generated a lot of interest in Eastern Canada. This technical note reviews their current configurations, major components and suitability to Canadian logging systems.
The classic ride model CR48 air-cushioned suspension for fifth-wheels was studied to determine its effects on fuel consumption saving, motion-induced vibrations, and load sway (trailer roll) when used on logging trucks in their actual working environment. Comparison of trips made by a tractor-trailer, on various road surfaces, both loaded and empty, with the air cushion inflated and deflated, shows overall improvements of 1 to 2% in the fuel consumption rate when inflated. Some positive effects on vibration levels were found on the tractor and trailer when loaded. Little improvement was found when empty. No detrimental effect on load sway was observed.
A roadside logging system consisting of a feller buncher, a grapple skidder, two stroke delimbers, and a but- and-top log loader was monitored as it harvested an old-growth stand in the central Interior of British Columbia. Productivity was calculated by phase, and delays caused by unequal productivities between phases were documented. Estimated logging costs by phase were included. The work cycle for a stroke delimber was examined using detailed-timing analysis. Study results showed that approximately 1.5 falling and processing shifts were required for each skidding shift, and that about 1.5 skidding shifts were required for each loading shift.