Impact test system and method of testing a helmeted impact

An impact test system comprising:

• an arm configured to support a helmeted headform in a mounted position, the helmeted headform including a headform wearing a helmet, the arm including:
• a tube disposed about a translation axis;
• a collar disposed about the translation axis and coupled to an end of the tube, the collar including a lower contact surface configured to abut a lower rear portion of the headform in the mounted position;
• an anti-rotation protrusion coupled to the collar and including an upper contact surface that is radially outward of the lower contact surface and is configured to abut an upper rear portion of the headform in the mounted position;
• and
• a piston extending within the tube and coupled to the tube for translation relative thereto along the translation axis between a retracted position and an extended position such that an end portion of the piston is configured to push the headform out of the mounted position and eject the helmeted headform away from the collar toward an impact surface, free from the arm.