US Patent 9383177 Hunting arrow having one release passage

A hunting arrow having an interior passage that permits both air and blood to flow freely therethrough. A broadhead at the front of the arrow has an intake opening that permits the flow to enter a tubular shaft of the arrow, and a nock at the rear has a discharge opening that permits the air and blood to exit the shaft. The blades of the broadhead are radially spaced to permit air and blood to enter the intake opening. The nock includes internal vanes that react with the flow of air exiting the discharge opening to impart rotation to the arrow. The nock also includes vents that allow a portion of the air to escape so as to react with channels on the exterior of the nock to further stabilize the arrow during flight.