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Putting green speed
and its variability
Micah Woods
Chief Scientist | Asian Turfgrass Center
www.asianturfgrass.com
29 November 2018
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Fuji Classic GC
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Today’s outline
1. Green speed as explained and as reported
2. Measurements I’ve made of green speed
3. Measurements under tournament conditions
4. Dispersion of ball roll
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The Stimpmeter instruction booklet
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First sentence:
“One of the most significant aspects
of a golf course is the uniformity of its
putting greens.”
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Second sentence:
“Variations in speed, whether from
one green to the next or on different
parts of the same green, can do more
to negate a player’s skill than can
ragged fairways or unkempt
bunkers.”
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Orchard Golf & CC
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PGA Catalunya
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Keilir GC
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Yufuin Kogen GC
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2. Measurements I’ve made of green speed
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Brooks GC, Japan
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Koshigaya GC with Dr. Eric Reasor & Dr. Jim Brosnan
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“The average golfer
seems unable to
detect a 6-inch
variation in green
speed … Therefore, a
6-inch variation
among greens is
probably a fair
definition of
consistency on a golf
course.”
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What is normal standard deviation within greens?
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What is normal standard deviation between greens?
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What does a standard deviation of 0.3
feet look like?
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3. Measurements under tournament conditions
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Keya GC
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Keya GC
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Measuring tools at Keya GC
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4. Dispersion of ball roll
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Balls rolled by “Perfect Putter”
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Balls marked and measured
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Dispersion measured
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Dispersion measured
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What happens when greens get
really fast?
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Hazeltine GC, 2016
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Hazeltine GC, 2016
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More information at
www.asianturfgrass.com