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US 11,686,562 B2Granted
Archery vane
OwnerKyle Davidsoninventor
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OwnerKyle Davidsoninventor
Estimating the term…
An aerodynamic element (often referred to as a vane or fletching) that is operatively coupled to the nock end (the back) of an arrow that adds significant stability associated with vanes of similar height (referred to as “high profile” in the archery community) without the noise (amplitude and frequency) commonly associated with such vanes while also providing low drag characteristics. The vane has an initial front or leading edge at a shallow initial angle relative to the axis of the arrow. When the vane is mounted at an angle (known as offset or helical) to the axis of the arrow, this front shallow initial angle (and area under it) is utilized as a vortex generator. This vortex mixes and therefore helps balance velocities in the lower pressure, large aft area which is initiated at a point along the leading edge that increases to a steeper angle relative to the initial angle. The top of the vane is parallel to the axis of the arrow for stability as well as sound advantages. The back edge of the vane then angles down at a steep angle in a straight line to help with noise as well as control airflow.
An aerodynamic element configured to improve a component center of pressure, rotational stability, reduce a low pressure developed when mounted in an offset or helical position relative to a longitudinal axis of a projectile, mounted in a plurality, that also reduces trailing edge vortices that generate sound in both amplitude and frequency, the aerodynamic element having a base geometry suitable to be operatively coupled to the outer diameter of the projectile, the aerodynamic element further having a profile above the base geometry defined with a thickness and having a height H and a length L, the height H and the length L having a ratio of approximately 1:4;
An aerodynamic element including a main element with a continuous profile, when operatively coupled to a projectile at an angle to a longitudinal axis of the projectile and therefore at an angle to the direction of flow of fluid, presents a leading edge having a shallow angle relative to the projectile followed by a steep angle relative to the projectile, the shallow angle being less than the steep angle, still in the plane of the main element that acts as a vortex generator which creates a vortex that travels down a low pressure side of a larger, main trailing area of the aerodynamic element mixing slower and faster moving fluids thereby reducing a pressure difference between a high pressure side and an opposing low pressure side of the element which reduces vortices off the trailing area created from the fluid attempting to travel from the high pressure side to the lower pressure side, along with the noise amplitude and high frequencies associated with vortex shedding.
A projectile with a plurality of aerodynamic elements operatively coupled to a projectile, each aerodynamic element configured to improve a component center of pressure, rotational stability, reduce a low pressure developed when mounted in an offset or helical position relative to a longitudinal axis of the projectile that also reduces trailing edge vortices that generate sound in both amplitude and frequency, the aerodynamic element having a base geometry suitable to be operatively coupled to the outer diameter of the projectile, a profile above the base geometry defined with some thickness and having a height H and a length L, the height H and the length L having a ratio of approximately 1:4;
Dependencies are inferred from the claim text.