5. Multiplying results from 3 and 4 get 97, thus y = 97/x, 



where y = setup time/acre 



X = average skidding distance 



97 = constant written into program as "XETUP" or "SETUP." 



At this point, one might question the accuracy of the hyperbolic function which was used 

 to determine setup times for all ranges of skidding distances . It is true that the function was 

 derived without benefit of data to match setup times with various skidding distances. Without 

 this data, we relied upon the most common portable tower configuration as the source for the 

 best values available. 



Figure 2. — Typical configuration for a high-lead^ portable tower. 



