Golf clubhead with a high polar moment of inertia

Details Golf clubhead with a high polar moment of inertia Golf clubhead with a high polar moment of inertia

1988-12-27

1990-02-06

Coven, Edward M.

Amusement devices: games

Puzzles

Take-aparts and put-togethers

273169, 273171, 273173, A63B 5304

Patent

active

048983870

ABSTRACT:
There is disclosed a putter head no longer, no wider, no higher, nor heavier than ordinary at 5.0.times.2.0.times.1.2 inches and 302 grams. Yet, it has a polar moment of inertia about 8300 g-cm.sup.2.
The polar inertial efficiency of a golf clubhead is defined as its actual moment of inertia divided by its maximum theoretical polar moment of inertia.
The theoretical polar moment of inertia is an intrinsic property of every golf clubhead. It is determined by positioning half the mass of the head at a toe point and the other half at a heel point a heel-to-toe length apart, and then calculating the polar moment of inertia from the center of mass for the system. Thus, for the preceeding head the theoretical moment of inertia is 12,200 g-cm.sup.2 giving an inertial efficiency in excess of 0.69.
By comparison, the polar inertial efficiency of any thin bar is shown to be 0.33. Prior art clubheads generally have inertial efficiencies close to this value, with the best clubheads having values slightly larger.
The putter head includes a low density striking face of alumininum and a toe section with a lead weight. The toe weight has an expanded surface area along the toe.
Mechanical expressions are developed which provide insight for the design of a clubhead with a high polar moment of inertia. The expressions involve masses, densities, lengths, and surface areas. It is also shown that a correctly designed, weighted clubhead is superior to a similar, un-weighted clubhead.

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"Need a New Putter", by Lew Fishman, Golf Digest, Dec. 1988, pp. 96-99.
"Long Green Glider" as seen in Golf World, May 28, 1976, p. 19.

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