Games using tangible projectile – Projectile – per se; part thereof or accessory therefor – Arrow – dart – or shuttlecock; part thereof
Patent
1996-10-04
1998-07-14
Graham, Mark S.
Games using tangible projectile
Projectile, per se; part thereof or accessory therefor
Arrow, dart, or shuttlecock; part thereof
F42B 604
Patent
active
057795770
ABSTRACT:
A system for selecting an arrow shaft by determining an optimum spine based on a type of bow, a point weight, a peak bow weight, and an arrow shaft length; and a graph for providing a pictorial representation of a relationship between static spine, dynamic spine, and weight per inch of the arrow shaft. In a preferred embodiment, a table which provides an optimum spine for combinations of different bow types, point weights, peak bow weights, and arrow shaft lengths is provided. A preferred method for selecting an arrow shaft comprises the steps of (a) selecting a bow type, (b) selecting a point weight in grains, (c) selecting a peak bow weight, (d) selecting an arrow length, (e) using an optimum spine selection table to determine an optimum spine which corresponds to the selected type of bow, point weight, peak bow weight, and arrow length, (f) selecting a spine versus shaft weight selection chart that corresponds to the optimum spine range, and (g) selecting the arrow shaft from one of a group of arrow shafts within a dynamic spine window on the spine versus shaft weight selection chart.
REFERENCES:
Easton Archery, 1993-1994 edition, pp. 1-29.
Easton Target.cndot.Field.cndot.3-D Shaft Size Selection Chart.
Easton Hunting Shaft Size Selection Chart.
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