Hello everyone, I'm an engineering student and I have to "size" a gas strut (i.e. spring+damper) to model a trunk lid opening mechanism. I have a problem: on every "datasheet" (something like this http://www.strutsdirect.co.uk/components/variable-force-gas-struts.php) only forces and dimensions are written but there's nothing about damping coefficent and spring constant. So, I would like to ask you if someone could tell me some approximated possible damping coefficent and spring constant values or how to obtain them from a datasheet. Thanks.