From Aqwa theory manual, 
, the unit of the damping coefficient can be determined
[N]=[beta] * [N/m] * [m/s], so that [beta] =[s]. Â
"Size" in Details of a fender is the uncompressed length of that fender along the fender normal direction. "Action" as Fender X-direction only means that the fender's normal direction is in the global x-direction at the definition position.
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