All measurements were made with two different riders and one dummy in different setups to simulate realistic body and head positions. All tests made with the static truncated dummy (with cut off lower arms and lower legs) were made in order to obtain a repeatable and accurate measurement of helmet performance. For time trial / triathlon helmets, the dummy body position was set to a typical flat position with the head measured in up to 2 different angles relative to the road - 45° (standard head position),and  60° (low head position).The wind tunnel results showed a consistent correlation between the two different experiments demonstrating the applicability of the data for  other riders. All measurements were made at 45km/h over a full yaw (cross-wind) range of -20° to +20°. The Swissside weighting system for 'triathletes' is applied to the results measured at all angles over the yaw range, to calculate one aero drag performance number in watts for each helmet. This is referred to as 'merit' aero p (w) in the data tables.