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Welcome to Dave Tutelman's Club Design Notes This e-book is about how golf clubs work, from the point of view of an engineer. But you don't have to be an engineer to understand it. There are some science basics early, explained in intuitive terms (see the Principles chapter). That is the only science the rest of the book really uses. You will need to understand simple graphs or tables of numbers -- but if you don't, you're seriously limited as a clubmaker already. You can jump in where you want, or just read the chapters sequentially. I've tried to be diligent about placing links, so if you jump in and encounter something that depends on what came earlier, you should be only be a click away from what you need. The Notes were first put on the Web in 1999. There have been a lot of advances since 1999 in our understanding of what makes a golf club work. There have also been advances in hype, legislation (in the USGA and R&A) to limit performance, and some real advances in club technology and instrumentation. It has been a challenge to keep this up-to-date, and what you see here is inevitably behind what I would like it to be. The updates continue; I know I won't catch up, but I'll keep trying. At the bottom of this page you will find a checklist of modifications: intended, under way, and completed. Introduction
Physical Principles Force,
Acceleration, and Velocity
Applying
Physics to GolfCentrifugal Force Torque Moment of inertia Vibrational frequency What determines distance Club Length Lie Angle Heft What
it is, and why we care
History Heft and release Fitting for heft Computing heft Estimating heft Graphs of moment of inertia and swingweight Measuring swingweight Measuring moment of inertia Other Heft Issues How I fit for Heft Altering heft
Shaft
Flex
The Shaft Flex Section is obsolete! What
is it, and why do we care?It is going to be replaced when I can get around to it. In the meantime, check the references on the temporary page. Measuring a golfer for flex Assigning a grade of flex The
standard flex grades
Length
and tip trimmingOther flex grades: Frequency Other flex grades: DSFI and RSSR Other flex grades: TrueTemper letter-number Other flex grades: Brunswick frequency slope Frequency matching Customizing The Clubs Effects of Clubhead Features Center
of gravity (CG)
Effects
of Shaft FeaturesFace angle Gear effect Grooves Lie angle Loft angle Offset Sole bounce and camber Weighting Material and manufacturing process Effects of Grip Features Special Situations Resources, References, and Bibliography Status of update:
Last updated -- Mar 3, 2019
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