FOOTBALL WITH FINS THAT PROMOTE ROTATION IN FLIGHT

A football (10) having external fins (15a, 15b) mounted on opposite sides thereof which are configured to promote rotation of the football (10) about its longitudinal axis (13). Each of the fins (15a, 15b) is configured as an airfoil having an upper surface (20) and a lower surface (22), with the un...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	BOYLE, BRENDAN, J, MANDELBAUM, FERN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AMUSEMENTS APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING,CLIMBING, OR FENCING BALL GAMES GAMES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HUMAN NECESSITIES SPORTS TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS TRAINING EQUIPMENT
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A football (10) having external fins (15a, 15b) mounted on opposite sides thereof which are configured to promote rotation of the football (10) about its longitudinal axis (13). Each of the fins (15a, 15b) is configured as an airfoil having an upper surface (20) and a lower surface (22), with the understanding that the upper surface (20) represents the direction of the lift. Each fin (15a, 15b) is oriented to form a helical pitch angle of at least 15 degrees. The leading (17) and trailing (18) edges of the fins (15a, 15b) are longitudinally positioned such that the net center of aerodynamic lift of the fins (15a, 15b) is located aft of the longitudinal midpoint of the football (10) in order to promote stability in flight. L'invention concerne un ballon ovale de football américain (10) présentant des ailerons externes (15a, 15b) montés sur les côtés opposés du ballon (10) et conçus pour favoriser la rotation de ce dernier sur son axe longitudinal (13). Chaque aileron (15a, 15b) est configuré comme un profil de voilure présentant une surface supérieure (20) et une surface inférieure (22), la surface supérieure (20) représentant la direction de la poussée. Chaque aileron (15a, 15b) est orienté de manière à former un angle d'inclinaison hélicoïdale d'au moins 15 degrés. Les bords d'attaque (17) et de fuite (18) des ailerons (15a, 15b) sont positionnés longitudinalement de façon que le centre net de la poussée aérodynamique de ces derniers (15a, 15b) soit situé à l'arrière du point central dudit ballon de football (10) afin de favoriser la stabilité en vol de celui-ci.