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.
Analysis of productivity and cost of forestry transportation : Part two: theoretical analysis of the impact of vehicle operating conditions on power losses, and experimental determination of the resistance forces attributable to oil churning
The first part of this report deals with the theory of energy balance of a moving vehicle, which will provide the basis for future investigations taking the form of duty cycle analysis. The second part of the report examines the data of a study of power losses though oil churning in the power transmission system. Results with regular and synthetic oils at different temperatures are given
