How does a ball fade/draw?
in [Golf]
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From: zox625 on 13 Aug 2010 15:19 Thinking about the physics of the golf ball, I assume that there must be some side-spin (something around the Z-axis or thereabouts) to make a ball fade or draw. (Assume right-handed golfer): I can get the idea how you could get clock-wise rotation (as seen from above) with a golf swing, (which would make it fade, right?), by having the club head pulling toward the golfer at contact. How do you swing to make it draw? I can't quite see how the club head would be moving away from the golfer at contact. ____________________________________________________________________� RecGroups : the community-oriented newsreader : www.recgroups.com
From: Frank Ketchum on 13 Aug 2010 15:07 "zox625" <a46668(a)webnntp.invalid> wrote in message news:meigj7xtek.ln2(a)recgroups.com... > Thinking about the physics of the golf ball, I assume that there must be > some side-spin (something around the Z-axis or thereabouts) to make a ball > fade or draw. > > (Assume right-handed golfer): I can get the idea how you could get > clock-wise rotation (as seen from above) with a golf swing, (which would > make it fade, right?), by having the club head pulling toward the golfer > at contact. Correct. > > How do you swing to make it draw? I can't quite see how the club head > would be moving away from the golfer at contact. Club should naturally be contacting ball from inside the target line, which does mean (slightly) going away from the golfer at impact. Spin is also imparted from the clubface being open or closed at impact. Open imparts cut spin, close imparts draw spin.
From: Alan Baker on 13 Aug 2010 15:07 In article <meigj7xtek.ln2(a)recgroups.com>, "zox625" <a46668(a)webnntp.invalid> wrote: > Thinking about the physics of the golf ball, I assume that there must be > some side-spin (something around the Z-axis or thereabouts) to make a ball > fade or draw. > > (Assume right-handed golfer): I can get the idea how you could get > clock-wise rotation (as seen from above) with a golf swing, (which would > make it fade, right?), by having the club head pulling toward the golfer > at contact. > > How do you swing to make it draw? I can't quite see how the club head > would be moving away from the golfer at contact. The golf ball curves because of aerodynamic forces created by its spin. There's no need for the club to be moving away or towards the golfer to get a particular spin. All that matter is the relationship between direction of motion of the clubhead and the direction in which the face... ...faces. Draw two vectors: The first is the direction the club head is traveling at impact, the second, the direction the club face is facing (a vector perpendicular to the club face. The spin of the ball is along an axis that is perpendicular to both of those vectors. So let's start with a "square" hit. The club is traveling directly at the target and the club is facing such that the vector normal to its face lies in a vertical plane that passes through the target. The axis of spin will be perfectly horizontal and square to the target. IOW, the ball will have pure backspin. The force generated by the backspin will be at right angles to the direction of motion and the axis of the spin; so essentially, upward. Now turn the face open a few degrees. The plane that contains the two vectors will change such that the balls axis of spin will now go downward (and a little backward) from left to right (for a rightie). IOW, the axis of the balls spin will now be tilted to the right at the top. The aerodynamic force created by the spin now points to the right. Close the face and the situation is reversed. -- Alan Baker Vancouver, British Columbia <http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg>
From: William Clark on 13 Aug 2010 15:24 In article <meigj7xtek.ln2(a)recgroups.com>, "zox625" <a46668(a)webnntp.invalid> wrote: > Thinking about the physics of the golf ball, I assume that there must be > some side-spin (something around the Z-axis or thereabouts) to make a ball > fade or draw. > > (Assume right-handed golfer): I can get the idea how you could get > clock-wise rotation (as seen from above) with a golf swing, (which would > make it fade, right?), by having the club head pulling toward the golfer > at contact. > > How do you swing to make it draw? I can't quite see how the club head > would be moving away from the golfer at contact. > > ____________________________________________________________________� > RecGroups : the community-oriented newsreader : www.recgroups.com Take the club back to the inside, then come through the ball inside to out, which will impart the draw.
From: JohnO on 13 Aug 2010 17:24
On Aug 14, 7:19 am, "zox625" <a46...(a)webnntp.invalid> wrote: > Thinking about the physics of the golf ball, I assume that there must be > some side-spin (something around the Z-axis or thereabouts) to make a ball > fade or draw. > > (Assume right-handed golfer): I can get the idea how you could get > clock-wise rotation (as seen from above) with a golf swing, (which would > make it fade, right?), by having the club head pulling toward the golfer > at contact. > > How do you swing to make it draw? I can't quite see how the club head > would be moving away from the golfer at contact. > > ____________________________________________________________________ > RecGroups : the community-oriented newsreader :www.recgroups.com The simple answer is that if, at the point of impact, the club face is not perpendicular to the club head path, there will be side spin. So even an inside-out swing path can still lead to cuts, hooks or straight flight depending on the club face angle. |