This paper describes the results of a study of log
truck travel speeds in three locations in Western Oregon on
favorable grades and curves. Independent variables of grade,
curve radius, width, ditch depth, superelevation, sight
distance, time of day, and maximum engine braking horsepower
were regressed against speed. Only grade...
Western hemlock and Sitka spruce are relatively thin-
barked species and susceptible to damage during thinning
operations. Damage to the wood allows decay-causing fungi
to enter resulting in loss of merchantable volume at the
time of final harvest. Cable yarding systems are needed for
much of the thinning because most...
A semi-empirical mobility model is presented which predicts tracked vehicle performance in timber harvesting applications. The interactions between the log load and the
terrain, the log load and the vehicle, and the vehicle and the terrain cause resistances for the vehicle. The mobility
model calculates these resistances, comparing them to...
LOCCOST is an interactive computer program that
predicts stump to mill logging costs, stumpage and net
present value of a harvest based on stand data, pond value
and logging parameters, entered by the user. The program is
intended for use by foresters to evaluate the economics of
different stand management...
The selection of a road standard is a complex decision involving consideration of design, construction, maintenance, and vehicle operating costs. The first step in any analysis involves a definition of the physically feasible alternatives. In the Oregon Coast Range, a combination of steep topography and sensitive soils influence the type...
The North Bend skyline system was first introduced into the Pacific Northwest in 1912 by the North Bend Lumber Company, North Bend, Washington. The system was able to raise the front end of logs over obstacles while yarding large payloads uphill. Yarding efficiency was improved since hangups were minimized. The...
Forest management is typically associated with a high degree of uncertainty, since it relies on predictions of natural growth processes over long periods of time. A number of methods exist for mitigating the risk associated with this uncertainty, but few have the ability to explicitly minimize risk. This study will...
