Straight as an arrow... literally!
Have you ever made a perfect shot, eventually recovered the animal and discovered your broadhead in a completely unexplainable location within the animal? (Or perhaps made a perfect shot and never recovered the animal?)
When you shoot a stationary target, once your broadhead strikes the surface, you know where the broadhead is. Nothing concerning the target has impacted the arrow/broadhead's trajectory.
Now, let's put your target in motion - say, a whitetail jumping the string, or even the subtle movements of an animal that's feeding. Every slight, or not so slight movement the animal makes will obviously affect the arrow/broadhead's trajectory - up, down; right, left.
This is a real problem for some broadhead designs. The movement alone causes the arrow/broadhead to veer off course as it enters the animal. Plus, animal movement also results in unanticipated angles of impact regarding the alignment of the animal's bones. For example, there is potentially more ribcage to punch through if the animal is quartering, compared to directly broadside.
The affects of target movement are lessened when using a two-blade broadhead design. Because the Helix rotates in flight, maintains momentum upon impact and has a superior cutting design, your arrow/arrowhead is more likely to maintain its trajectory.
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