Bend-Twist Coupled Golf Club Shaft

Technology #13438a

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Peter Ifju, Ph.D.
Peter Ifju, Ph.D., is a Knox T. Millsaps Professor at the University of Florida and is the Co-Program Director of the Department of Mechanical and Aerospace Engineering. He earned his Ph.D. from Virginia Polytechnic Institute in Materials Engineering Science in 1992. In 2000, “Discovery” magazine granted Dr. Ifju a Top Ten Technology Innovation Award for Micro Air Vehicle Development. His research interests include the development, application and fielding of Unmanned Aircraft Systems (UAS) for natural resources and agriculture, micro air vehicles, and experimental stress analysis.
Jarrod Bonsmann, Ph.D.
Jarrod Bonsmann, Ph.D., was a graduate student research assistant at the University of Florida. He earned his B.S. in Aerospace Engineering at the University of Florida in 2008, and his M.S. in Mechanical Engineering from the University of Florida in 2010. He further earned his Ph.D. in Mechanical Engineering from the University of Maryland in 2013.
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US Patent Pending

Adjustable Graphite/Epoxy Golf Club Shaft for More Accurate, Controlled Strokes

This graphite/epoxy golf club shaft counters the twisting effect that usually occurs when the club is subjected to the inertial forces incurred by applied pressure. When a golf club is swung, the shaft of the club undergoes a series of bending deflections, causing it to bend through the swing. In response to the inertial force of these bending deflections, a twisting effect also occurs mid-swing, causing the club face to open or close, rather than strike the ball perfectly perpendicular as a play would intend. This happens to even the best golfers because, until now, this twisting effect was relatively unpredictable and uncontrollable. Researchers at the University of Florida have designed a graphite/epoxy composite club shaft capable of resisting the twist that occurs under the applied pressure of a golf swing. In addition to the complete elimination of the twisting effect, the design of this composite shaft also allows for the twist to be controlled and predisposed if it is in fact desired. The weight saved by using the graphite/epoxy composite also allows the golfer to achieve a higher acceleration of the golf club with the same amount of force put into a swing.


A graphite/epoxy composite that can control the degree of twisting that occurs when the material is under pressure.


  • Compensates for a less-than-perfect swing, reducing the chance of slicing or hooking the ball
  • User has the option to adjust the bend, loft, and direction of his golf swing by just adjusting the shaft, affording more accurate, controlled strokes
  • More accurate ball contact on a more frequent and repeatable basis, leading to better club-ball impact behavior
  • Features an improved shaft design, allowing for a significantly lighter weight golf club
  • Built with a composite graphite/epoxy, saving production and manufacturing costs


When force is applied to a metal, plastic, or composite material, that material undergoes a series of bending deflections that cause it to bow in response to the applied pressure. In order to accommodate the bend, a twisting effect also frequently occurs, which inadvertently changes the plane of the material’s edges. This new graphite/epoxy composite golf club counters this twisting effect, allowing for the shaft to bend under pressure without twisting or buckling. Depending on the player’s skill level and desired application, the composite can either completely eliminate or control the twisting effect.

Patent Pending: See Technology 13438 for more information