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First & foremost... "methinks a well-managed forgettery would come in very handy on the subject of COR"... Woody
The coefficient of restitution or "COR" of an object is a fractional value (always expressed as a number between 0.000 and 1.000) representing the ratio of velocities before and after an impact. Elasticity is a measure of how much bounce there is, or in other words, how much of the kinetic energy of the colliding objects before the collision remains as kinetic energy of the objects after the collision. An object with a "COR" of 1.000 collides elastically (100% elasticity), while an object with a "COR" of 0.000 will collide inelastic (zero elasticity), effectively "sticking" to the object it collides with, or not bouncing at all.
Coefficient of Restitution, as it relates to golf, is the energy transfer that occurs when a club head collides
with a ball. “COR” is directly related to the speed of a golf ball as it rebounds
from the clubface, and is generally equal to the rebound speed of the ball divided
by the initial speed of the club-head. Example, if the initial club-head speed is 100 MPH, and the rebound speed of the ball is 80 MPH, the “COR” would
be approximately .800. The maximum “COR” the USGA allows on drivers is .830.
| In terms of determining the distance a ball travels, a variety of factors contribute to this list: |
1. Swing speed.
2. Shaft flex & torque.
3. Tip stiffness.
4. Club-head center of gravity.
5. Launch angle.
6. Loft.
7. Angle of attack.
8. Clubface contact point (sweet-spot/or not).
9. Type of ball.
10. Wind & Weather. |
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For these and other reasons, Caldwell Golf chooses not to use “COR” while trying to sell you a golf club. |
That said, the MalibuWoody does conform to the USGA Rules of Golf!
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