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Biomechanics of the Backhand Frisbee Throw

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Matthew Zych

on 16 November 2012

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Transcript of Biomechanics of the Backhand Frisbee Throw

BY: Matthew Zych Biomechanics of a Backhand Frisbee Throw Magnus Force Lift force created by spin Biomechanical Question What are the main biomechanical concepts behind the perfect backhanded Frisbee throw? I have been playing Ultimate Frisbee recreationally with my swim team the past few years. Why I Choose Topic Overall Diagonal Plane
Saggital: Extension of the Elbow
Frontal: Lateral movement due to abduction of the shoulder
Transverse: shoulder rotation, torso rotation Major Planes of Movement Technique The act of throwing a Frisbee creates torque at 6 different places in the body.
Torque Angular Momentum quantity of angular motion possessed by a body; measured as the product of the moment of inertia and angular velocity. Errors and Improvements Errors
Throwing the Frisbee with your knees straightened
Not throwing with your whole body but just with your shoulders and arm.
Not keeping the Frisbee in a flat plane going throughout the throwing motion.

Improvements
Make sure to keep a bend in your knees during release, it will help you shift weight forward during the throw.
The throw should start from your hips and make its way out to your wrist.
Keep the Frisbee on a flat plane and it will fly flatter and straighter Conclusion Biomechanical Question: What are the main biomechanical concepts behind the perfect backhanded Frisbee throw?

Concepts:

Torque
Magnus Force
Angular Momentum References Rotary effect of a force about an axis of rotation, measured as the product of the force and the perpendicular distance between the force's line of action and the axis. Torso
Clavicle
Scapula
Humerus
Radial/Ulnar
Hand (wrist flexion) Wrist rapid rotation is the dominant factor imparting spin to the Frisbee which is critical for flight stability Wrist flick and extension is where the lift force is created during the throw. The various forces that effect a Frisbee in the air are not centered on the disc, so it needs angular momentum to keep from flipping over in air. When a Frisbee is thrown with a large spin, it has a large amount of angular momentum, causing the frisbee to be more stable in the air. The history of the modern ”Frisbee” dates to 1871 in Bridgeport,
Connecticut where William Russell Frisbie opened a small bakery, The
Frisbie Pie Company. Frisbie’s pies were popular at the nearby Yale
University and students began to enjoy tossing the empty pie tins
around. This became more popular and students began to call the
tins ”Frisbies” and the act of throwing them ”Frisbie-ing” Hummel, Sarah A., & Hubbard, Mont. (2000). A Musculoskeletal Model for Backhand Frisbee Throws. Retrieved from http://biosport.ucdavis.edu/research-projects/frisbee-flight-simulation-and-throw-biomechanics/8thISCSB_Frisbee_throws.pdf

·Hubbard, M., & Hubbard, M. 2000) Simulation of Frisbee Flight. Retrieved from http://biosport.ucdavis.edu/research-projects/frisbee-flight-simulation-and-throw-biomechanics/5thMACS_Frisbee_Simulation.pdf

Morrison, V.R. (2005). The Physics of Frisbees. Retrieved from http://web.mit.edu/womens-ult/www/smite/frisbee_physics.pdf (Angular Momentum)
Bent Knees, weight on back foot, cross throwing arm over front of your body.
Make sure throughout to keep the frisbee on a flat plane
As you shift your weight to your front foot, bring the frisbee across your body while rotating your torso and extending your arm
flick your wrist near the end of full arm extension Releasing the Frisbee when the elbow is closer to full extension might be more conducive to generating higher Frisbee velocity, however this configuration also would increase the risk of hyperextension and injury to the elbow. Subconscious protection mechanisms seem to inhibit full extension. This has been observed in other throwing events including baseball. (Hummel, 2003)
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