Golf Club Head Inertia Variation for Flight Stability
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Solution Overview
Problem
Iron-type golf clubs with higher loft angles experience unstable flight distances due to varying back spin caused by off-center hits, leading to inconsistent ball flight.
Innovation Solution
A set of iron-type golf clubs with club heads having gradually increased loft angles and coefficients of inertia, where the difference in coefficients between the highest and lowest lofted club heads is 0.3 or more, along with a design featuring a top side protruding part and specific metallic materials distribution to reduce vertical gear effect and stabilize back spin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the loft angle of the club head is increased to hit the ball higher and achieve greater vertical gear effect, then the ball flight height is improved, but the back spin amount becomes unstable and flight distance stability deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying the coefficient of inertia (A) across different club heads in the set. Specifically, club heads are designed with progressively increasing coefficients of inertia corresponding to increasing loft angles. This parameter adjustment stabilizes the relationship between loft angle and back spin, ensuring that higher lofted clubs maintain consistent back spin amounts and stable flight distances while still achieving the desired ball flight height.
2Reliability
If the coefficient of inertia is increased to stabilize back spin and improve flight distance stability, then the vertical gear effect is reduced, but the club head design complexity increases
Solution Approach 1:
The patent applies local quality by implementing differentiated coefficient of inertia values specifically in the club head design. Each club head is designed with a locally optimized coefficient of inertia that corresponds to its specific loft angle, rather than using a uniform design across all clubs. This localized parameter adjustment achieves flight distance stability while maintaining manageable design complexity through systematic progression rather than radical design changes.
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 solution stabilizes flight distances and reduces back spin variability, enhancing the consistency of golf ball flight even with higher loft angles by adjusting the moment of inertia and mass distribution in the club heads.
Implementation Method 1
the coefficient of inertia (A) of the club head is the ratio Ms/M of a moment of inertia Ms (gram sq·cm) of the club head around a horizontal axis extending in a toe-heel direction of the club head passing through the center of gravity of the club head
Data Source
AI summary
A set of iron-type golf clubs and a set of iron-type golf club heads are disclosed. The loft angles of the heads are gradually increased from the lowest numbered golf club to the highest numbered golf club in the set. Given that a coefficient of inertia of the head is the ratio Ms/M of a moment of inertia Ms (gram sq·cm) of the head around a horizontal axis extending in a toe-heel direction of the head passing through the center of gravity of the head, to the mass M (g) of the head, the coefficient of inertia is gradually increased with the increase in the loft angle, and the difference of the coefficient of inertia of the head of the highest numbered club from that of the lowest numbered club is 0.3 or more.