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Why Size Matters in MOI, Moment of Inertia, Radii of Gyration in Traditional Putters

The formula for MOI, moment of inertia, is mass (g) times distance (cm) squared. So you can increase MOI a little by increasing the mass; but a lot by increasing the distance of the mass from the axis of rotation. MOI divided by mass is radius of gyration squared (k2). This is a very simple calculation; and allows a direct measure of the effectiveness of the mass distribution in generating MOI.

Why Size Matters in MOI

The Scottsdale anser was an important improvement over the old blades; 19% more k2 (9.43/7.92) than the old blade. The Newport 2 was another important improvement; 30% more k2 (12.34/9.43) than the original anser style blade. But there is a limit to the improvement possible in the traditional geometry using the heavy steel base material. Steel weighs about 7.92 g/cm3

The CURE TX1 develops 40% more k2 (17.41/12.34) than the Newport 2 by using lightweight aircraft grade aluminum as a base material. The aluminum weighs only 2.72 g/cm3 (and feels great!). By using tungsten weights in the toe and heel, the TX1 develops the MOI of a large high mallet in a blade.

The CURE RX5 uses the same aircraft grade aluminum but in a 6” wide putter; developing levels of MOI, STABILITY and forgiveness never before seen.