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The figure depicts a drag test setup with a wheelchair and subject on a treadmill, measuring drag force using a force transducer, studying mechanical efficiency of lever-propulsion mechanisms.
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Figure 2. Drag test setup showing wheelchair and subject on treadmill while force transducer measures drag force (Fd). Lui J, MacGillivray MK, Sheel AW, Jeyasurya J, Sadeghi M, Sawatzky BJ. Mechanical efficiency of two commercial lever-propulsion for mechanisms for manual wheelchair locomotion. J Rehabil Res Dev. 2013;50(10):1363–72. http://dx.doi.org/10.1682/JRRD.2013.02.0034