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    Prediction equations for estimating cycle time were developed for five small tractors studied under various silvicultural treatments and operating conditions. The tractors studied included the Pasquali 933, a Holder A60F, a Forest Ant Forwarder (Skogsman), a Massey-Ferguson, and a Sam4 Minitarus. Skidding costs were estimated based on the cycle-time equations. Using these equations to determine the incremental effect of log size on cost shows that hooking a 30-fP log cost $0.1 03/ft3 while hooking six logs to form a 30-cubic foot turn cost $0.234/ft3, an increase of 127 percent.

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    LeDoux, Chris B.; Huyler, Neil K. 1992. Cycle-time equations for five small tractors operating in low-volume small-diameter hardwood stands. Res. Pap. NE-664. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 6 p.


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    Harvesting, thinning, cost, production

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