Best Stiff vs. Regular Flex Driver: 8+ Guide


Best Stiff vs. Regular Flex Driver: 8+ Guide

Shaft flexibility in golf golf equipment is categorized by descriptors like “stiff” and “common,” indicating how a lot the shaft bends throughout a swing. This attribute considerably influences launch angle, trajectory, and general distance. A shaft with much less bend (“stiff”) is mostly suited to golfers with quicker swing speeds, whereas a shaft with extra bend (“common”) is best suited to these with average swing speeds. Selecting the suitable shaft flexibility is essential for optimizing efficiency and accuracy.

Matching shaft flexibility to a golfer’s swing pace is essential for maximizing distance and management. An improper match can result in inconsistent pictures, lack of distance, and issue controlling trajectory. Traditionally, shaft expertise has advanced considerably, with developments in supplies and design resulting in lighter and extra responsive shafts. This evolution has expanded the becoming choices obtainable, permitting for extra exact matching of shaft traits to particular person swing profiles.

This understanding of shaft flexibility supplies a basis for exploring associated matters corresponding to swing evaluation, membership becoming, and the affect of shaft supplies on efficiency. By contemplating these elements, golfers could make knowledgeable selections to enhance their sport.

1. Swing Pace

Swing pace is essentially the most essential think about figuring out the suitable driver shaft flex. A correct match between swing pace and shaft flex optimizes power switch, launch situations, and in the end, distance and accuracy. Mismatched flex can result in suboptimal efficiency and inconsistent ball flight.

  • Driver Head Pace and Shaft Flex

    Driver head pace, measured in miles per hour (mph), straight correlates with the beneficial shaft flex. Usually, slower swing speeds (beneath 90 mph) profit from common or senior flex shafts, whereas quicker swing speeds (above 105 mph) require stiffer shafts like further stiff or tour stiff. Mid-range swing speeds (90-105 mph) usually fall into the common or stiff flex class, relying on particular person traits and preferences.

  • Impression of Shaft Flex on Launch and Spin

    Shaft flex influences launch angle and spin fee. Stiffer shafts produce a decrease launch angle and decrease spin fee, excellent for quicker swing speeds to forestall ballooning and maximize distance. Extra versatile shafts generate the next launch angle and better spin fee, serving to slower swing speeds obtain larger carry and distance.

  • Figuring out Swing Pace

    Swing pace may be measured utilizing launch displays or private swing pace radar units. Golf professionals can even present an estimated swing pace evaluation. Correct measurement is important for correct membership becoming.

  • Becoming Past Swing Pace

    Whereas swing pace is the first issue, different parts like tempo, transition, and launch level additionally affect shaft choice. A complete membership becoming with a certified skilled considers all these elements to make sure the optimum match.

Understanding the connection between swing pace and shaft flex is prime for attaining optimum driver efficiency. A correct match maximizes distance, management, and general enjoyment of the sport. Consulting a membership becoming skilled ensures customized suggestions based mostly on a complete evaluation of swing traits.

2. Launch Angle

Launch angle, the vertical angle at which the ball leaves the clubface, is considerably influenced by driver shaft flex. This relationship performs an important function in figuring out trajectory, carry distance, and general efficiency. A stiffer shaft usually produces a decrease launch angle, whereas a extra versatile shaft generates the next launch angle. This cause-and-effect relationship stems from the differing bending traits of the shafts in the course of the swing. A stiffer shaft resists bending, resulting in a descending blow and decrease launch. Conversely, a extra versatile shaft bends extra simply, facilitating an upward strike and better launch.

Contemplate a golfer with a quick swing pace utilizing a daily flex shaft. The extreme bending of the shaft may trigger an excessively excessive launch angle, resulting in a lack of distance and management. Alternatively, a golfer with a slower swing pace utilizing a stiff shaft may wrestle to generate enough launch, leading to low, quick pictures. Skilled golfers usually make the most of launch displays to fine-tune launch angle by adjusting shaft flex, loft, and different membership specs. This optimization demonstrates the sensible significance of understanding the launch angle/shaft flex relationship.

Optimizing launch angle by way of correct shaft choice is essential for maximizing distance and attaining desired ball flight. Challenges come up when golfers prioritize distance over management, resulting in improper shaft choice. A balanced strategy considers swing traits, desired trajectory, and course situations. A radical understanding of the interaction between launch angle and shaft flex empowers golfers to make knowledgeable selections about tools and swing mechanics, in the end contributing to improved efficiency.

3. Spin Fee

Spin fee, the rotations per minute (RPM) of the golf ball in flight, is straight influenced by driver shaft flex. Stiffer shafts usually produce decrease spin charges, whereas extra versatile shafts generate greater spin charges. This relationship stems from the dynamics of the golf swing and the affect of shaft flex on clubhead supply. A stiffer shaft, resisting bending in the course of the downswing, delivers the clubhead to the ball with a much less upward angle of assault, lowering backspin. Conversely, a extra versatile shaft, bending extra readily, promotes a extra upward angle of assault, growing backspin. For instance, a golfer with a excessive swing pace utilizing a daily flex shaft may expertise extreme spin, resulting in a ballooning trajectory and diminished distance. Conversely, a golfer with a slower swing pace utilizing a stiff shaft may wrestle to generate enough spin, leading to a low, flat trajectory with minimal carry.

The significance of spin fee as a element of driver efficiency lies in its affect on trajectory and distance. Optimum spin fee maximizes carry and roll, contributing to general distance. An excessive amount of spin results in a excessive, quick flight, whereas too little spin ends in a low trajectory with much less carry. Skilled golfers usually analyze spin fee information utilizing launch displays to optimize their tools and swing mechanics. They could regulate shaft flex, loft, and even ball sort to attain the specified spin fee for particular course situations. Novice golfers can even profit from understanding the connection between spin fee and shaft flex. Selecting the suitable shaft flex based mostly on swing pace and desired trajectory can considerably enhance efficiency.

Understanding the interaction between spin fee and shaft flex permits golfers to make knowledgeable selections about tools and optimize their swing for max distance and management. Challenges come up when golfers focus solely on distance with out contemplating the affect of spin fee. A balanced strategy, incorporating spin fee optimization, results in extra constant and efficient ball flight. This understanding is essential for translating swing mechanics and tools decisions into improved on-course efficiency.

4. Ball Trajectory

Ball trajectory, the flight path of the golf ball, is considerably influenced by driver shaft flex. Understanding this relationship is essential for optimizing distance, accuracy, and general efficiency. Shaft flex impacts launch angle and spin fee, which straight decide the trajectory’s top and form. A correct match between shaft flex and swing traits ensures the specified trajectory for particular course situations and enjoying kinds.

  • Launch Angle Affect

    Shaft flex straight impacts launch angle. Stiffer shafts promote a decrease launch angle, leading to a extra penetrating trajectory with much less backspin. Extra versatile shafts generate the next launch angle, resulting in the next, extra arched trajectory with elevated backspin. For instance, a golfer with a quick swing pace utilizing a stiff shaft may obtain a decrease, flatter trajectory excellent for windy situations. Conversely, a golfer with a slower swing pace utilizing a daily flex shaft may profit from the next trajectory to maximise carry distance over obstacles.

  • Spin Fee Impact

    Spin fee, influenced by shaft flex, additional shapes the trajectory. Decrease spin charges, usually related to stiffer shafts, contribute to a flatter trajectory with extra roll. Greater spin charges, usually generated by extra versatile shafts, create the next, softer trajectory with much less roll. Contemplate a golfer looking for most distance on a agency fairway. A decrease spin fee achieved with a stiffer shaft could be advantageous. Conversely, a golfer enjoying on a softer fairway may profit from the next spin fee generated by a extra versatile shaft to attain higher stopping energy on the inexperienced.

  • Trajectory Management and Adaptability

    Matching shaft flex to swing traits allows golfers to regulate trajectory in line with course situations and shot necessities. A golfer dealing with a headwind may go for a stiffer shaft to attain a decrease, extra penetrating trajectory that cuts by way of the wind. Conversely, a golfer needing to hold a hazard may select a extra versatile shaft for the next trajectory. This adaptability highlights the sensible significance of understanding the shaft flex/trajectory relationship.

  • Impression on Distance and Accuracy

    The optimized trajectory ensuing from correct shaft choice contributes to each distance and accuracy. A trajectory that maximizes carry and roll with out extreme aspect spin enhances general distance. Moreover, a managed trajectory improves accuracy by permitting golfers to focus on particular touchdown areas with larger consistency. This mixture of distance and accuracy underscores the significance of matching shaft flex to particular person swing traits.

By understanding the connection between ball trajectory and driver shaft flex, golfers could make knowledgeable selections about tools choice and optimize their swing mechanics. This understanding empowers golfers to attain desired trajectories, resulting in improved distance, accuracy, and general efficiency on the course. Ignoring this important relationship can result in inconsistent ball flight, diminished distance, and issue controlling shot form. A complete understanding of those rules allows golfers to maximise their potential and luxuriate in a extra constant and rewarding sport.

5. Distance

Distance, a essential efficiency metric in golf, is considerably influenced by driver shaft flex. The connection hinges on the interaction of launch angle, spin fee, and ball pace, all affected by how a lot the shaft bends in the course of the swing. A correctly matched shaft optimizes these elements, maximizing distance potential. An improper match can result in inefficient power switch, suboptimal launch situations, and in the end, diminished distance. Contemplate a golfer with a excessive swing pace utilizing a daily flex shaft. The extreme bending may trigger a excessive launch angle with extreme spin, leading to a lack of distance. Conversely, a golfer with a slower swing pace utilizing a stiff shaft may wrestle to generate enough launch and spin, resulting in shorter pictures.

The significance of distance as a element of driver efficiency is plain. Maximizing distance permits golfers to achieve greens in fewer strokes, enhancing scoring alternatives. It additionally supplies a bonus on longer holes and enhances general course administration methods. Skilled golfers meticulously analyze launch information and regulate shaft flex to optimize distance based mostly on swing traits and course situations. They perceive that maximizing distance requires a balanced strategy, contemplating not solely shaft flex but in addition different elements like loft and ball sort. For novice golfers, understanding the affect of shaft flex on distance can considerably enhance efficiency. A correct becoming, contemplating swing pace and different particular person traits, can result in noticeable distance features.

Optimizing distance by way of correct shaft choice is essential for attaining decrease scores and larger enjoyment of the sport. Challenges come up when golfers prioritize distance above all else, neglecting the significance of accuracy and management. A balanced strategy, contemplating each distance and dispersion, results in extra constant and efficient efficiency. Understanding the connection between distance and driver shaft flex is a key step in the direction of enhancing general sport and attaining {golfing} objectives. This information, mixed with skilled becoming and apply, empowers golfers to unlock their distance potential and play their greatest.

6. Accuracy

Accuracy, a cornerstone of efficient golf, is considerably influenced by driver shaft flex. Whereas distance usually takes heart stage, constant accuracy is paramount for decrease scores and improved efficiency. The connection between accuracy and shaft flex hinges on management, a direct consequence of matching the shaft’s bending traits to a golfer’s swing. A correctly fitted shaft promotes constant ball hanging and predictable shot form, resulting in larger accuracy. Conversely, an improper match can lead to inconsistent contact, erratic ball flight, and diminished management, in the end hindering accuracy.

  • Middle Face Contact

    Constant heart face contact is important for accuracy. The proper shaft flex permits the golfer to ship the clubhead squarely to the ball, maximizing power switch and minimizing dispersion. An improper flex can result in off-center hits, leading to decreased accuracy and distance. As an example, a golfer with a quick swing utilizing a too-flexible shaft may expertise issue timing the discharge, resulting in heel or toe strikes. Conversely, a golfer with a slower swing utilizing a too-stiff shaft may wrestle to sq. the clubface at affect, producing related off-center hits.

  • Dispersion Management

    Dispersion, the diploma to which pictures deviate from the supposed goal line, is straight impacted by shaft flex. A correctly fitted shaft promotes tighter dispersion patterns, growing accuracy and consistency. An improper flex can result in wider dispersion, making it troublesome to constantly hit fairways or greens. Contemplate a golfer aiming for a selected touchdown space. With the right shaft flex, pictures will cluster nearer to the goal, demonstrating improved accuracy. With an improper flex, pictures may scatter extra broadly, highlighting a lack of management and decreased accuracy.

  • Shot Form Consistency

    Controlling shot shapedraws, fades, or straight shotsis important for strategic course administration and correct focusing on. The proper shaft flex facilitates constant shot shaping by selling predictable ball flight. An improper flex could make it troublesome to regulate shot form, resulting in unpredictable outcomes. For instance, a golfer who usually performs a draw may discover their pictures fading with a very stiff shaft. Conversely, a golfer who prefers a fade may see their pictures drawing with a shaft that’s too versatile.

  • Impression of Swing Tempo

    Swing tempo, the rhythm and timing of the swing, interacts with shaft flex to have an effect on accuracy. A easy, constant tempo, paired with the suitable shaft flex, promotes managed, correct pictures. Conversely, an inconsistent tempo, exacerbated by an improper shaft flex, can result in erratic ball hanging and decreased accuracy. As an example, a golfer with a quick tempo may profit from a stiffer shaft to regulate the timing and improve accuracy. A golfer with a slower tempo may discover a extra versatile shaft improves timing and management.

Accuracy in golf depends closely on constant ball hanging and predictable ball flight. By understanding the affect of driver shaft flex on these parts, golfers could make knowledgeable tools decisions to enhance their accuracy and general efficiency. A correct becoming, contemplating swing traits and desired shot form, is essential for maximizing accuracy and attaining decrease scores. Neglecting the affect of shaft flex on accuracy can result in inconsistent efficiency and frustration on the course. A complete understanding of this relationship empowers golfers to make knowledgeable selections, resulting in larger management, improved accuracy, and a extra rewarding enjoying expertise.

7. Management

Management, a essential side of golf efficiency, is considerably influenced by driver shaft flex. The power to form pictures, management trajectory, and preserve accuracy depends closely on matching the shaft’s bending traits to the golfer’s swing. A correctly fitted shaft enhances management, permitting for intentional shot shaping and predictable ball flight. Conversely, an improper match can diminish management, resulting in inconsistent outcomes and issue managing trajectory and accuracy. This connection between shaft flex and management is important for golfers looking for to refine their sport and execute desired pictures with consistency and precision.

  • Trajectory Management

    Trajectory management, the power to control the peak and form of the ball flight, is straight influenced by shaft flex. Stiffer shafts promote decrease, extra penetrating trajectories, whereas extra versatile shafts produce greater, extra arched trajectories. This affect permits golfers to adapt to various wind situations and course layouts. For instance, a decrease trajectory could be most popular in robust headwinds, whereas the next trajectory could be essential to hold obstacles or maximize distance on a shorter gap. Choosing the suitable shaft flex empowers golfers to regulate trajectory and optimize efficiency based mostly on particular enjoying situations.

  • Shot Shaping Precision

    Shot shaping, the intentional manipulation of ball curvature (attracts or fades), is considerably impacted by shaft flex. The proper shaft flex permits for predictable and managed shot shaping, enabling golfers to navigate doglegs, keep away from hazards, or assault particular pin positions. An improper flex could make it troublesome to constantly form pictures, resulting in unpredictable outcomes and missed alternatives. A golfer aiming for a draw, for instance, may expertise an undesirable fade with a shaft that’s too stiff, highlighting the significance of correct shaft choice for exact shot shaping.

  • Dispersion Administration

    Dispersion, the diploma to which pictures deviate from the supposed goal line, is straight associated to regulate. A correctly fitted shaft promotes tighter dispersion patterns, indicating larger management and consistency. An improper flex can result in wider dispersion, making it troublesome to constantly discover the green or inexperienced. As an example, a golfer utilizing a shaft that’s too versatile may expertise inconsistent ball hanging and elevated aspect spin, resulting in wider dispersion and decreased accuracy. Conversely, a shaft that’s too stiff can even contribute to off-center hits and erratic ball flight.

  • Affect of Swing Tempo and Transition

    A golfer’s swing tempo and transition, the change from backswing to downswing, work together with shaft flex to affect management. A easy, managed transition, paired with the suitable shaft flex, enhances general management and shot consistency. An abrupt or inconsistent transition, exacerbated by an improper shaft flex, can diminish management, resulting in unpredictable ball flight and decreased accuracy. Golfers with quicker tempos may profit from stiffer shafts to take care of management in the course of the downswing, whereas these with smoother tempos may discover extra versatile shafts improve their rhythm and timing.

Management in golf is multifaceted, encompassing trajectory, shot form, dispersion, and the affect of particular person swing traits. The proper driver shaft flex performs an important function in optimizing these parts, empowering golfers to execute desired pictures with larger consistency and precision. Ignoring the affect of shaft flex on management can result in inconsistent efficiency and issue managing ball flight. A complete understanding of this relationship, mixed with skilled becoming, permits golfers to refine their management, enhance accuracy, and obtain decrease scores.

8. Really feel

Really feel in golf, a subjective but essential side of efficiency, is straight influenced by driver shaft flex. This often-overlooked ingredient describes the sensory suggestions a golfer receives in the course of the swing, impacting timing, confidence, and in the end, efficiency. The connection between really feel and shaft flex stems from the shaft’s bending traits in the course of the swing. A stiffer shaft transmits extra vibrations and suggestions to the fingers, usually described as a “sturdy” or “boardy” really feel. A extra versatile shaft absorbs extra vibrations, resulting in a smoother, much less resistant really feel, typically described as “whippy.” This distinction in sensory suggestions impacts a golfer’s notion of the clubhead all through the swing, influencing timing and management. For instance, a golfer accustomed to a stiff shaft may discover a common flex shaft feels too free and unresponsive, making it troublesome to sense the clubhead’s place in the course of the swing. Conversely, a golfer used to a daily flex may understand a stiff shaft as too inflexible and unforgiving, hindering easy tempo and constant timing.

The significance of really feel as a element of driver efficiency lies in its affect on confidence and consistency. A golfer who feels snug and linked to the membership is extra prone to swing confidently and produce constant outcomes. Conversely, a golfer combating an unfamiliar or uncomfortable really feel may expertise hesitation and inconsistency of their swing. Skilled golfers usually prioritize really feel when choosing tools, recognizing its affect on efficiency. They could experiment with completely different shaft flexes to seek out the optimum stability between management and luxury. For novice golfers, understanding the affect of shaft flex on really feel can considerably enhance efficiency and delight of the sport. A correct becoming, contemplating particular person preferences and swing traits, can result in elevated confidence and extra constant outcomes. Contemplate a golfer transitioning from a daily to a stiff flex shaft. Initially, the stiffer shaft may really feel harsh and unforgiving. Nevertheless, with apply and adaptation, the golfer may develop a choice for the elevated suggestions and management supplied by the stiffer shaft, in the end resulting in improved efficiency.

Optimizing really feel by way of correct shaft choice enhances confidence, consistency, and general enjoyment of the sport. Challenges come up when golfers prioritize goal metrics like distance and ball pace over subjective really feel. A balanced strategy acknowledges the significance of each goal information and subjective suggestions. Ignoring the affect of shaft flex on really feel can result in discomfort, inconsistency, and decreased enjoyment. A complete understanding of this relationship, mixed with customized becoming, empowers golfers to decide on tools that feels proper and promotes assured, constant efficiency. This understanding permits golfers to translate sensory suggestions into improved swing mechanics and in the end, a extra rewarding enjoying expertise. It underscores the significance of customized membership becoming, the place each goal information and subjective suggestions contribute to discovering the perfect shaft flex for particular person wants and preferences.

Incessantly Requested Questions

Choosing the suitable driver shaft flex is essential for optimizing efficiency. This FAQ addresses widespread questions and misconceptions relating to “stiff” versus “common” flex.

Query 1: How does swing pace decide the right shaft flex?

Swing pace is the first issue. Sooner swing speeds usually require stiffer shafts to regulate launch and spin, whereas slower swing speeds profit from extra versatile shafts to generate enough launch and carry.

Query 2: What occurs if the shaft flex is simply too stiff?

A shaft that’s too stiff can lead to a low, weak ball flight with diminished distance. It will possibly additionally make it troublesome to sq. the clubface at affect, resulting in inconsistent accuracy.

Query 3: What occurs if the shaft flex is simply too versatile?

A shaft that’s too versatile could cause a excessive, ballooning trajectory with extreme spin, additionally resulting in diminished distance. It will possibly additionally create inconsistencies in shot form and accuracy.

Query 4: Can different elements apart from swing pace affect shaft flex choice?

Sure. Tempo, transition, and launch level can even affect the optimum shaft flex. A complete membership becoming considers these elements for a exact suggestion.

Query 5: Ought to really feel be thought of when selecting shaft flex?

Really feel performs a big function in confidence and consistency. Whereas goal information like swing pace is essential, subjective really feel shouldn’t be disregarded. A golfer ought to really feel snug and linked to the membership for optimum efficiency.

Query 6: How can a golfer decide their excellent shaft flex?

An expert membership becoming is essentially the most dependable methodology for figuring out the perfect shaft flex. Launch displays and knowledgeable evaluation present goal information and customized suggestions based mostly on particular person swing traits.

Understanding the nuances of shaft flex is essential for maximizing driver efficiency. A radical understanding of those rules, mixed with skilled steerage, permits golfers to make knowledgeable selections and enhance their sport.

For additional insights into driver expertise and efficiency optimization, discover the next sections on clubhead design, loft, and adjustability. These facets, mixed with correct shaft choice, contribute to a complete strategy to driver efficiency enhancement.

Optimizing Driver Efficiency

Choosing the right driver shaft flex is paramount for maximizing distance, accuracy, and general efficiency. The next ideas present steerage on navigating the essential determination between “stiff” and “common” flex.

Tip 1: Prioritize Skilled Membership Becoming: An expert membership becoming supplies goal information and customized suggestions based mostly on particular person swing traits, guaranteeing the optimum match between shaft flex and swing dynamics.

Tip 2: Perceive the Relationship Between Swing Pace and Shaft Flex: Sooner swing speeds usually require stiffer shafts to regulate launch and spin, whereas slower swing speeds profit from extra versatile shafts for elevated launch and carry. Precisely assessing swing pace is prime for knowledgeable shaft choice.

Tip 3: Contemplate Tempo and Transition: Whereas swing pace is the first issue, tempo and transition affect shaft conduct. A easy, deliberate transition may profit from a extra versatile shaft, whereas a faster transition may require a stiffer shaft for optimum management.

Tip 4: Think about Desired Ball Flight: Decrease, extra penetrating trajectories are usually achieved with stiffer shafts, whereas greater, extra arched trajectories profit from extra versatile shafts. Contemplate desired ball flight based mostly heading in the right direction situations and private preferences.

Tip 5: Do not Neglect the Significance of Really feel: Whereas goal information is essential, subjective really feel performs a big function in confidence and consistency. A golfer ought to really feel snug and linked to the membership for optimum efficiency. Experimenting with completely different shaft flexes throughout a becoming helps determine the popular really feel.

Tip 6: Keep away from the “Distance Entice”: Focusing solely on distance can result in improper shaft choice. Prioritize a stability of distance, accuracy, and management for optimum efficiency. A shaft that generates extreme distance however compromises accuracy is counterproductive.

Tip 7: Repeatedly Reassess Shaft Flex: Swing traits can change over time because of bodily conditioning, swing changes, or age. Periodically reassessing shaft flex ensures continued optimization and efficiency features.

By understanding and making use of these rules, golfers could make knowledgeable selections relating to shaft flex, resulting in improved distance, accuracy, and general efficiency. Correct shaft choice is an important ingredient of maximizing driver efficiency and attaining decrease scores.

This complete exploration of shaft flex supplies a stable basis for understanding its essential function in driver efficiency. The following conclusion will summarize the important thing takeaways and emphasize the significance of customized membership becoming for attaining optimum outcomes.

Conclusion

The exploration of shaft flex traits, encompassing the excellence between “stiff” and “common” choices, has revealed its profound affect on driver efficiency. Key elements corresponding to swing pace, launch angle, spin fee, ball trajectory, distance, accuracy, management, and really feel are all considerably influenced by the selection of shaft flex. A complete understanding of those interconnected parts is important for optimizing driver efficiency and attaining desired outcomes. The evaluation has highlighted the significance of matching shaft flex to particular person swing traits, emphasizing the detrimental results of mismatched tools. Prioritizing a balanced strategy that considers each goal information and subjective suggestions is essential for maximizing efficiency features and attaining {golfing} objectives.

The pursuit of optimum driver efficiency necessitates a dedication to knowledgeable decision-making and customized membership becoming. Leveraging technological developments like launch displays and knowledgeable evaluation empowers golfers to make data-driven decisions relating to shaft flex and different essential membership specs. This proactive strategy to tools choice, coupled with devoted apply and swing refinement, unlocks a golfer’s full potential, resulting in enhanced efficiency, elevated confidence, and a extra rewarding enjoying expertise. Continued exploration of developments in driver expertise and swing mechanics will additional refine the understanding of shaft flex optimization and its contribution to attaining peak efficiency on the course.