Table 1. Measurement data for the 3 arborist blocks used in this study. Refer to Figure 3a for the interpretation of the geometric parameters. Data were recorded in inches or pounds-force (lbf), at the accuracy given by the values in parentheses.
BlockTread radius mm (in.)Shaft radius mm (in.)Sheave weight N (lbf)
BGF27.559 (1.0850)9.525 (0.375)2.2241 (0.5)
Hobbs52.324 (2.060)9.525 (0.375)5.8383 (1.3125)
Wall29.21 (1.150)9.3898 (0.370)6.3943 (1.4375)