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Golf ball dimples and lift?
I learned from an article that a dimpled golf ball improves its lift in flight. At the same spin rate, the dimpled golf ball would exert a higher lift force than a smooth force.
What is the concept behind the increase in lift? I understand how dimples can reduce drag, but not HOW dimples can improve lift.
2 Answers
- 1 decade agoFavorite Answer
Ah yes, those dimples.
Well like you said they aid with producing lift. When hit correctly, the ball will fly with a backspin. This spin will have the dimples route more of the air it's traveling through to go over the top of the ball faster and in effect lowering the air pressure.
And just like anything that flies, higher air pressure on the bottom will push the object up.
Had the ball not been spinning then the drag in front of the ball would slow it down heavily whereas a spinning ball with dimples will decrease the air pressure on the top by moving the over it, creating lift, and send it hurling toward the green.
I like to think of the dimple's job as shoveling air in front of it over the top.
- 1 decade ago
Spinning balls moving through the air in the real world only generate drag not lift. The Magnus effect is caused by uneven friction drag around the spinning ball. The uneven friction drag is caused by the spinning ball being pushed into the oncoming air not unlike a spinning car tire being pushed into the ground, both tend to turn a circular force into a more linear force. Because the Magnus effect is caused by friction drag, surface preparations that cause more friction drag on the balls surface cause more Magnus effect. The more the ball spins while going through the air the more Magnus effect yet when determining the aerodynamic force that causes the Magnus effect the very large fact that the ball is spinning is totally ignored. Its pretty obvious that they are determining the lift from the relative airflow caused by the balls motion through the air when it fact it is caused by its motion through the air as well as it motion while in the air (rotation). Calling the Magnus effect lift is based on the false premise that the ball is not spinning, and totally ignores the large influence rotation has on the relative airflow that is influencing the ball. Not very scientific but it shows the amount of skew of actual occurrence that is acceptable when writing formula.
Source(s): The real world