LynnBlakeGolf Forums - Trajectory Control

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Trajectory Control

To quote "Clubface loft (2-C-1) and Hinge Action (2-D) determine altitude and backspin and are the basic elements of Ball Control."

Can someone explain to me why hinge action has any effect on the above parameters is loft is given. Isn't it redundant? Shouldn't it just be Clubface Loft determine.....

or

Is he saying that the hinge action creates a loft and it's just poorly written?

Quote:

Originally Posted by nevercrosses (Post 77008)

HK is saying that much of the Spin on a Ball is caused by the Line of Compression although some spin is caused by the ball rolling on the face of the inclined striker. Hinge Action controls the Line of Compression, therefore Hinge Action also is a factor in determining altitude and Spin; Ball Control.

Quote:

Originally Posted by nevercrosses (Post 77008)

That is quite a question for your first post Nevercrosses. Have you bee studying TGM very long?

Quote:

Originally Posted by Daryl (Post 77010)

Just to clarify, are you saying the amount of the spin is mostly caused by the Line of Compression? Does speed play a part? Does loft play a part? Is HK also assuming a centered strike?

He goes on to say in 2-C-0 that maximum compression is the ideal result. Where can I find his definition of compression?

Quote:

Originally Posted by nevercrosses (Post 77012)

HK Said:

Quote:

The Principle of Golf is the “Line of Compression.” The Mechanics of Golf is the production and manipulation of the “Line of Compression.” Precision is recognizing and reconciling minute differentiations.

and

Quote:

The ball is subjected to a violent deforming compression. The ball is actually distorted, not compressed – except for reduction of one dimension. Rubber is incompressible. Trapped air bubbles can be compressed – but not the rubber itself – it flows. It flows in two directions – but acts like a solid in the third. This third direction is the direction of the compressing force. The momentum of the violent return of flow after impact also distorts the ball by exceeding the normal dimension of the compressed point. The “kick” given to the ball by this action is an important factor in ball response. Roll of the ball on the face of an inclined striker does not account for all the action produced by such an impact, especially in imparting spin to the ball. When the direction of the compressing force does not pass exactly through the center of the ball, a spin will be imparted to the ball. It will rotate on the plane of a line drawn form the line of compression to a parallel center line.

and most Important is:

Quote:

2-C-0 LINEAR FORCE The ball will respond to non-linear (angular) force exactly the same as to linear forces only if the application produce forces equally linear to the ball but not necessarily linear to anything external to the ball.

Briefly stated, it is necessary to find a way to compress the ball through a particular point along a particular line, and maintain this compression through the same particular point along this same particular line straight line, through the entire arc of the Impact Interval, and with geometrical precision for consistent control. Study 2-K and 2-N.

To maintain compression at a particular point that point, then, must rotate around the same center that the rotating force does. Not just the physical center of the ball nor the gravitational center – just the point of compression. In other words, the original contact points of the Clubface and ball must remain in contact throughout the entire Impact Interval. This is possible only if the motion – or arc – is uniform. Therefore there must be a perfectly centered action – or a compensating manipulation.

The Ball leaves the Clubface with a force proportional to the compression produced by Impact. Then the ideal result of the above procedures is maximum compression. But any Clubface imprecision during Impact will permit compression to leak away. Lost compression cannot be recovered. Between the precision Impact of 2-C-1#3 and the total loss of compression in 2-C-3#3, there can be every degree of Compression Leakage – some intentional (Back Spin) but mostly unintentional. Your main lines of defense are the Flat Left Wrist, Hinge Action and a Three Dimensional Downstroke – that is DOWNward (Attack Angle) AND OUTward (Plane Angle) AND FORward (Approach Angle) per 2-C-1#2A/B. Study 2-H, 2-N and 7-3.

And finally, to help further your understanding:

Quote:

2-H SHOULDER MOTIONS The point may be made that it is impossible to inscribe perfect circles while the center is in motion – that is the turning Shoulder. The straight line requirements of the Compression Point are satisfied as long as both the Vertical and Horizontal Centers move precisely in unison. Direction control remains stable because both Centers are also moving in a circle – that is, the circumference of the Shoulder Turn.

Bold by Daryl to highlight points of interest.

Quote:

Originally Posted by nevercrosses (Post 77008)

He's just noting that - not only is the delivered loft important at impact - but also the motion the face is making through impact will affect the actual loft at separation.

Quote:

Originally Posted by nevercrosses (Post 77012)

Amount of spin is controlled by the location of the line of compression and the amount of compression. If speed affects the amount of compression and/or the location - then yes speed. Since loft is one factor that controls the location of the line of compression - then yes it plays a part.

He wouldn't assume a centered strike - but he would assume a strike on the sweet spot as one factor influencing a "maximum" compression impact. He also covers some issues of impacts where there is "compression leakage".

Besides studying the Golfing Machine book and the issues that you are interested in - you'd best understand his definition of compression by looking it up in the dictionary - also see the "Line of Compression" in the Glossary of the book.

Am I correct in saying that maximum compression is created with the least amount of loft (assuming all other impact variable remaining constant)?

If so, why would this be the most desirable?

Quote:

Originally Posted by nevercrosses (Post 77026)

Am I correct in saying that maximum compression is created with the least amount of loft (assuming all other impact variable remaining constant)?

If so, why would this be the most desirable?

First, let me say that I do see an issue with Homer Kelley's writings and ball flight. Second, the D Plane does expose a key concept(s) that isn't stated or implied in the Golfing Machine. And that maybe all you are really seeking - now on to your specific questions.

Regarding your first question above - Yes.

Regarding your second question - If so, why would this be the most desirable? The statement of "maximum compression is most desirable" would be in the context of any particular club. Your question to me implies your comparing a two iron to a 9 iron - which obviously isn't what we are doing - unless you want to take it literally - which wouldn't be very smart. Really the goal of maximum compression would just allow you to hit shorter clubs into holes - thereby creating more control based on the shorter club - more loft, etc. As long as you know what you are doing or can consistently repeat it - then that's what's really important to the general golfing public. If you are not shooting for the ideal then there are alot of good golfers that plan on compression leakage - and given any issues in their swing actually use it for a purpose - that is to create less spin on the ball and therefore prevent less curvature on their shots. Essentially - creating or living with compression leakage is one compensation a player can make for other flaws in their swing.

Quote:

Originally Posted by drewitgolf (Post 77011)

That is quite a question for your first post Nevercrosses. Have you bee studying TGM very long?

Studying? Maybe not the right word. Reading and rereading and rereading would be better. There's so much information about golf, I'm just trying to get it straight in my head.

Was it a good or bad question?