Factors Influencing Rotary Performance

Series effects in motor performance studies.

“…A number of studies reported in the human engineering literature might be characterized as having the general purpose of determining the optimal level of some stimulus condition for the performance of a particular task. Examples of the independent variables investigated in studies of this kind are differences in radii of handcranks (Reed, 1948), distance of a foot control from the back of a seat (Gough & Beard, 1936), and the angle of a display in remote handling equipment (Baker, 1960). The dependent variable is typically some measure of speed or accuracy of performance on a particular task.…”

The Design of Operator Controls: A Selected Bibliography

“…This literature is immense, and no attempt was made to exhaust it bibliographically. Illustrative examples, however, include handedness and crank operation (303), handgrip controls (84) and knob operation (38).…”

Human motor activities: Speed and accuracy.

“…Direction of rotation and hand used in cranking. For rapid cranking under no-torque conditions, Reed [35] found no significant difference between clockwise and counterclockwise rotation. As mentioned earlier, and as shown in Figure 11-14, the preferred hand performs better in the rapid operation of cranks than the nonpreferred hand.…”

“…Incidentally, it can be seen that the preferred hand (right or left as the case may be) is faster than the nonpreferred hand. [35].) Thus, it seems that for speed cranking without any torque, the optimum range of crank sizes seems to be from about 0.8-in.…”