FERIC sampled butt-damage on 25 interior felling operations. One hand- faller, 4 shear machines and 20 non-shear machines were sampled. Lumber trim losses (2 X 6-inch basis) to remove damage were predicted as a percentage of total lumber content in the tree. Predicted losses were highest for the shear machines, substantially lower for most non-shear machines and negligible for the hand-faller.
This report was prepared under the auspices of the ENFOR (Energy from the Forest) Program of the Canadian Forestry Service. It investigated compaction as an addition to comminution, or as an alternative to comminution, as a practical and economical means for handling transporting and processing logging residues so that they can become a greater source of energy in Canada.
This study was carried out under the auspices of the International Energy Agency, Forest Energy Group C. One of the major objectives of the IEA is to provide co-operation among IEA participants in the development of alternative energy sources and through energy related research and development. This report reviews the current state-of-the-art in the harvesting and transport of logging residuals and residues, including stumps.
The free-flying aerial logging vehicle is an attractive alternative to conventional cable logging systems on steep slopes, because it requires fewer roads and landings, permits shorter operational lead times and reduces environmental impacts. Helicopter are being used to log high value timber, but high operating costs and limited payloads often offset the advantages. Heavy-lift airships, combining both static (helium) lift and aerodynamic lift, may offer a lower-cost alternative. Much of the world's remaining high quality timber is on areas too inaccessible for too environmentally sensitive for economical logging by current methods. The cyclocrane and other heavy-lift airship developments show promise for overcoming these obstacles.
This study was carried out under the auspices of the International Energy Agency, Forest Energy Group C. One of the major objectives of the IEA is to provide co-operation among IEA Participants development of alternative energy sources and through energy related research and development. This report is a state-of-the-art review of the equipment used for the preparation of forest biomass for optimum conversion into energy.