Equestrian helmet star system

A method of evaluating a helmet, comprising:

• applying a first impact configuration to the helmet and a second helmet that is a same model as the helmet, the first impact configuration comprising a first pair of single impacts applied separately to a front of each of the helmet and the second helmet, a second pair of single impacts applied separately to a side of each of the helmet and the second helmet, and a third pair of single impacts applied separately to a rear of each of the helmet and the second helmet;
• applying a second impact configuration to a third helmet and a fourth helmet that are each the same model as the helmet, the second impact configuration comprising a fourth pair of single impacts applied separately to a front of each of the third helmet and the fourth helmet, a fifth pair of single impacts applied separately to a side of each of the third helmet and the fourth helmet, and a sixth pair of single impacts applied separately to a rear of each of the third helmet and the fourth helmet;
• determining a plurality of injury risk values associated with the first and the second impact configurations, the plurality of injury risk values comprising an injury risk value for each of the first, the second, the third, the fourth, the fifth, and the sixth pair of single impacts of each of the first and the second impact configurations, wherein the injury risk value is determined based on an averaged linear acceleration value and an averaged angular acceleration value calculated for each of the first, the second, the third, the fourth, the fifth, and the sixth pair of single impacts of each of the first and the second impact configurations;
• and
• determining an overall injury risk metric for the helmet based on the plurality of injury risk values and a plurality of exposure values associated with the first and the second impact configurations.