Lawn Speeds and their Measurement
by Louis Nel
Lawn speed is an important consideration for enjoyable croquet. When comparing lawn A to lawn B as regards speed, we call lawn A faster than lawn B if, for the same initial velocity, a croquet ball will roll further on lawn A than on lawn B.
There are two reasons why faster lawns (up to a reasonable limit) are generally considered preferable to slower lawns. On the faster lawn, full rolls and pass rolls can be executed with control over longer distances than on slower lawns. In fact, on a really slow lawn, the routine split shot to hoops 2 and 3 after scoring hoop 1 can sometimes not be executed at all. Some standard rush shots are likewise impossible. This is frustrating to the player who has spent a lot of time practicing these basic shots only to find (at a certain tournament) that he cannot put them to use and must now resort to a more primitive style of play. A second reason, is that for play near the hoops a faster lawn better separates the men from the boys - a slow lawn is too forgiving of slipshod play.
In view of the above, it is useful to have an objective measurement of lawn speed, suitable for comparison of lawns at different venues. Such a measurement already exists: the well known Time Test. To apply it, one measures the time (in seconds) that a ball takes to come to rest on the North boundary of a full court after being struck on the South boundary. However, it is relatively cumbersome to apply this test. Two people are needed, one to strike the ball, the second to measure the time. Most of the time the struck ball - being the uncooperative inanimate object which it is - will not come to rest exactly on the north boundary, but be a few feet too long or short. So a lot of trial shots need to be recorded, with tabulation of the erroneous distances reached and corresponding times measured, and interpolation and averaging applied before an accurate measurement is possible.
This calls for simplification. So we invented the Standard Ramp Test (SR test) for lawn speed. It can be done by one person in just a few minutes, with simple equipment which is easily transportable and widely available. (Those familiar with the Stimpmeter tests used for Golf greens, will notice some similarity while recognizing that the Standard Ramp Test introduced here is more precise and more suitable for comparison of lawn speeds at different places measured by different people. For theoretical discussion of rolling croquet balls and further discussion of distance based mesurements, see the article of Ian Plummer elsewhere on this website).
(a) An ordinary straight rectangular plank about 6 inches wide and ¾ inch thick and of length at least 48 inches, preferably an inch or so longer. If it is longer than 48 inches, then a distance of 48 inches from its end should be clearly marked by a line across on the upper surface and a similar line on its lower surface directly below the one on the upper surface.
(b) a measuring tape capable of measuring up to about 16 feet (for most lawns; for an exceptionally fast lawns a longer tape is useful).
Procedure for applying the Standard Ramp Test
Install the plank so that the 48" mark on its bottom side is at rest exactly 12 inches above the ground while its opposite end rests on the ground. A convenient way of doing this is to let that 48" mark on its bottom surface lean on the crown of a hoop. A hoop should (by croquet rules/laws) be installed so that the top of its crown is exactly 12 inches above the ground. On a given hoop this may be a little off, so for an accurate application of the SR test, check the height of the crown and correct if necessary before proceeding.(No skidding was noticed in our tests, of either ball on ramp or ball on grass)
Place a croquet ball so that it rests on the 48" mark on the top surface of the plank, equidistant from the two sides. Let go of the ball without pushing it and let it roll down the ramp onto the lawn until it naturally comes to rest. Care should be taken to ensure that the ball does not run off the plank before reaching the bottom.
Measure the distance the balled rolled on the lawn i.e. the distance from the lower edge of the plank to the center of the ball in its rest position.
For a good measurement, Step 3 should be repeated several times and the average taken. That average is the Test Distance obtained i.e. the looked for Test Result.
The distances of successive balls traveling over the same terrain will normally differ very little, typically by no more than 6" over a distance of 14 feet.
If there is any reason to believe that the terrain used is not typical of the whole lawn, then the whole test should be repeated at various places and the various Test Distances obtained should all be recorded and reported. This is particularly relevant where there is a discernable slope in the lawn. The recorded measurements should state, for example, that the North to South Test Distance is 14'6" while the South to North distance is 13'6".
The following should be recorded.
Since lawn speeds vary considerably over the course of the season (generally slower in spring than in midsummer), and with wetness of the soil, length to which grass has been cut, the Remarks in (c) can be very important so as to convey an accurate impression. The absence of remarks will suggest that there was nothing special as regards wetness or cut to report i.e. that it seemed a typical speed for the time of year suggested by the date and time of day.
Wait, if possible, until all dew has evaporated.
List of recorded Standard Ramp Test esults
We invite players to do an SR measurement at their club and send it to us for posting. We would like to collect this information from as many venues as possible: Louis Nel can be contacted on acna (at) magma.ca
19 May 2005
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