Driver Club Head Geometry for Higher Ball Speed Within CT Limits
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Solution Overview
Problem
Golf club designers face a challenge in maximizing ball speed while maintaining compliance with the United States Golf Association's (USGA) Characteristic Time (CT) limits, as increasing strike face thickness for higher ball speed often exceeds these limits.
Innovation Solution
A driver-type golf club head design with a shallower and thinner strike face, combined with strategic redistribution of mass and adjustments to the club head's geometry, maintains CT within USGA limits while achieving higher ball speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the strike face thickness is increased to achieve higher ball speed, then the ball speed is improved, but the Characteristic Time (CT) exceeds USGA limits
Solution Approach 1:
The patent applies parameter changes by precisely controlling the strike face thickness within a specific range (0.060 to 0.100 inches) and adjusting the face height (1.50 to 1.75 inches) to optimize the balance between ball speed and CT. By changing these dimensional parameters, the design achieves higher ball speeds while keeping CT within USGA limits, resolving the contradiction between speed improvement and CT constraint.
Solution Approach 2:
The patent implements local quality by creating variable thickness zones within the strike face, with different regions having different thickness values. This allows specific areas of the face to be optimized for ball speed while other areas control the overall CT, enabling localized performance enhancement without exceeding regulatory limits across the entire face.
2Duration of action of moving object
If the strike face thickness is decreased to maintain CT within limits, then the CT compliance is improved, but the ball speed is reduced
Solution Approach 1:
The patent overcomes this limitation by changing multiple parameters simultaneously - not just thickness but also face height, curvature radii, and mass distribution. This multi-parameter optimization allows the design to maintain CT compliance while compensating for the reduced thickness through other geometric adjustments that preserve or enhance ball speed.
Solution Approach 2:
The patent transitions from a single-dimensional solution (thickness only) to a multi-dimensional approach by incorporating face height, curvature radii (bulge and roll), and mass distribution into the optimization. This dimensional expansion allows the design to achieve CT compliance and ball speed goals through combined geometric effects rather than relying solely on thickness.
3Speed
If the strike face area is increased to provide greater face flexion, then the ball speed is improved, but the Club Head Volume exceeds USGA limits
Solution Approach 1:
The patent applies this principle by designing a thin yet flexible strike face that can achieve significant flexion and rebound effect. The thin face (0.060 to 0.100 inches) acts as a flexible membrane that stores and releases energy during impact, generating high ball speeds without requiring a large club head volume, thus complying with USGA regulations.
Solution Approach 2:
The patent utilizes curvature by specifying particular bulge radius (0.75 to 1.25 inches) and roll radius (1.50 to 2.50 inches) to create a rounded, flexible face geometry. This spherical curvature enables the face to flex more effectively during impact, enhancing ball speed generation within the constraints of reduced thickness and volume.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design results in a net gain in ball speed and improved durability, while adhering to CT regulations, by optimizing strike face thickness and height, and redistributing mass to enhance moment of inertia and center of gravity positioning.
Implementation Method 1
The striking surface can be analogous to a drum surface or a trampoline, where a larger surface will create more flexion/displacement of that surface. This holds true for golf club faces as well.
Implementation Method 2
CT measurement is indicative of the flexibility and energy transfer of the face.
Data Source
AI summary
A driver-type golf club head having a reduced strike face height and a reduced strike face thickness produces a greater golf ball launch speed while maintaining a conforming CT value. In addition, the driver-type golf club head preserves or improves the club head durability, ball flight path optimization, and forgiveness by careful club head mass distribution.