Arrow Ballistics Study | 2026

FoC | KPI Definitions

Plain-language definitions, formulas, and directions for the derived KPIs used in the FoC analysis.


bh_extra_drift	Broadhead extra drift past field point under torque	How much farther the torqued broadhead landed past the torqued field point, laterally.	inches	Lower is better	Torqued field-point x centroid; torqued broadhead x centroid	Torqued field-point x centroid minus torqued broadhead x centroid.	Torqued field point; torqued broadhead	Positive values mean the broadhead drifted farther in the torque-jig direction than the field point did.
fb_dist_from_aim	Broadhead distance from synthetic aim under torque	Signed lateral miss from the synthetic torqued aim point to the torqued broadhead centroid.	inches	Lower is better	Untorqued field-point x centroid; torqued broadhead x centroid	Untorqued field-point x centroid plus 18 in, minus torqued broadhead x centroid.	Untorqued field point; torqued broadhead	The 18 in offset is the synthetic aim point for the torque condition, representing where the bow now points after the riser is rotated by the torque jig.
mr_fb_unt	Untorqued broadhead mean radius	Mean shot radius of the untorqued QAD Exodus 100gr fixed-blade broadhead group.	inches	Lower is better	Untorqued broadhead group shot coordinates	mean(sqrt((x_i - mean_x)^2 + (y_i - mean_y)^2)) over the untorqued broadhead group.	Untorqued broadhead	Primary broadhead group-quality metric and the headline KPI for the FoC and dynamic-spine results.
mr_fb_trq	Torqued broadhead mean radius	Mean shot radius of the same broadhead group under the torque condition.	inches	Lower is better	Torqued broadhead group shot coordinates	mean(sqrt((x_i - mean_x)^2 + (y_i - mean_y)^2)) over the torqued broadhead group.	Torqued broadhead	Broadhead group-quality companion under torque; signals resilience to bow-hand torque.
mr_fp_unt	Untorqued field point mean radius	Mean shot radius of the untorqued field-point group.	inches	Lower is better	Untorqued field-point group shot coordinates	mean(sqrt((x_i - mean_x)^2 + (y_i - mean_y)^2)) over the untorqued field-point group.	Untorqued field point	Field-point comparator; field-point groups are much tighter than broadhead groups in this matrix.
mr_fp_trq	Torqued field point mean radius	Mean shot radius of the field-point group under the torque condition.	inches	Lower is better	Torqued field-point group shot coordinates	mean(sqrt((x_i - mean_x)^2 + (y_i - mean_y)^2)) over the torqued field-point group.	Torqued field point	Field-point comparator under torque.

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