This involves solving the quadratic equation: To calculate the time when converted to 50m pool length we need to solve the equation for T50.Ĭonverted Time = T50 * PoolMeasure – (TurnFactor / T50) * (NumTurnperH – 1) The expression for pool length conversion is: The first step – conversion from the actual length pool in which the swim was made to the 50m equivalent is slightly more complicated. Rounded to nearest tenth and truncated = 57.3 seconds Rounded to nearest tenth and truncated = 62.2 secondsįor a 33 1/3 yds pool there is a difference in distance swum, therefore PoolMeasure = 0.91187 and the extra number of turns = 1Ħ3.5 * 0.91187 – 0.63779527 * 1 = 57.2659 seconds TurnVal = TurnFactor / T50 = 40.5/63.5 = 0.63779527įor a 25m pool there is no difference in the distance swum, therefore Poolmeasure = 1 and the extra number of turns = 2.Ħ3.5 * 1 – 0.63779527 * 2 = 62.22 seconds (BUT note that 1650 yards is a special case)ġ00m Backstroke in a 50m pool in 63.5 seconds The PoolMeasure (Event Distance Factor) value for metric and “36 2/3y”, “27 1/2y” pools is the same constant for all events on the basis that the distance covered does not vary by very much between the two categories, i.e. The table also shows the PoolMeasure (Event Distance Factor) for each event in Imperial yards pools. Where TurnFactor is provided by the LookUp table shown below. The Time per turn is determined by the relationship: NumTurnperH = Number of turns per 100 in the required length pool. TurnVal = Time per turn – The time in seconds attributed to execution of a single turn The second step – 50m pool length to desired pool length – is expressed as:Ĭonverted Time = T50 * PoolMeasure – TurnVal * (NumTurnperH – 1) The second step then involves using the same turning speed factors and the new distance and pool length to convert from 50m pool length to the desired pool length. The first step process involves using the turning speed factors for the event and the difference in distance covered between the actual pool length for the swim and a 50m pool. Compute the equivalent pool time 50m pool time to the time in the desired pool length(s). Convert the actual swim time achieved to the equivalent time in a 50m pool.Ģ. #Time converter swimming manual#The factors used have been influenced by the original manual tables.ġ. The time benefit/deficit of executing more or less turns during the swim Difference in distance actually covered.Ģ. To establish the equivalent time in a different length pool the following factors have to be allowed for:ġ. #Time converter swimming download#The EQUIVALENT PERFORMANCE TABLES have been available for download from British Swimming website since 2004. Where differences from the original tables occur they are due to the inherently greater accuracy of the modern digital computer and to the direct transfer from computer to printers artwork. The tables have been determined and printed using modern computing methods, however the rules for converting times has been retained. The range of times covered by the tables has been reviewed in line with current World Records, National Standard Times and the lowest grade of the Graded Swimming system. These tables are a reworked and expanded version of the original EQUIVALENT PERFORMANCE TABLES developed by Rex Smith.įour new tables have been added to cater for the 50 metres on each of the strokes. This is the official basis for all time conversions used for Championship entries by the ASA and its constituent clubs, counties and regions. The current ASA Equivalent Performance Tables were computer generated by SPORTSYSTEMS. Http iframes are not shown in https pages in many major browsers.
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