Trampoline Effect #2

Figs 1 and 2 show respectively the coefficient of restitution, COR, and the impact duration, Δt, for a large range for the stiffnes, k1, of the clubace. The dashed blue lines indicate the limit values, COR = 0.83 and impact duration Δt = 0.00045 sec, for a perfectly rigid clubface. The optimum trampoline effect, COR = 0.92, was obtained previously for a stiffness of k1 = 1470000 N/m which is corresponds to the vertical blue lines.

The trampoline effect is associated with an increase in the impact duration Δt for the model, from 0.00045 to 0.00071 sec. This means that the clubhead and ball are traveling together for a larger distance. Taking the average clubhead speed during impact this distance increases from 1.65 cm (0.65 inch) to 2.6 cm (1.02 inch). This is indeed a substantial increase.

The clubhead velocity gain of the trampoline effect is a given but what about this increase in distance clubhead and ball travel together? What is the opinion of the experts? Is there any known effect on spin, directional accuracy, trajectory, etc.?

mandrin