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Re: Didn't we already talk science? (1095 Views)
Posted by: TGJB (IP Logged)
Date: May 29, 2002 03:27PM
I'm glad you brought this up. The following is one of my posts following last year's B.C.
TGJB
Changing Track Speeds
Posted by TGJB on November 17, 2001 at 20:52:56:
One of the few reasonable questions posted amid all the recent noise was, in effect, what would cause a track to change speeds during the day?
Track speed is to a large degree a function of moisture. The variables include: composition of track relative to holding water, amount of water added, when the water is added (before the races, between the races, between some of the races), proximity to large bodies of water (Bay Meadows and Monmouth are examples of tracks where tracks change speed regulary, presumably because of the tides), temperature (in terms of freeze, thaws, and general drying out on hot days), and wind (evaporation).
Even if water is added each race, in equal amounts, the track can change speed. If x is added, it may be cancelled out by evaporation, At 3x, it gets a lot wetter throughout the day. At 1/2x, it gets dryer. At track A, it may get faster as it gets wetter, while at track B it may get slower. At track C, it may get faster until it reaches a certain degree of wetness, and then gets slower.
If a lot of water is added before the races, but not between them, you get a gradual drying, perhaps with the track speed getting faster or slower, but then leveling off at some point when the water has evaporated. Unless the temperature is below freezing, in which case you get a gradual freeze, and the track gets faster; except, for example, at Turfway, where the chemicals in the track keep it from freezing, so it just gets thick and slow.
Keep in mind how small a change in speed we're talking about. One fifth of a second equals one point. Lets say a race goes in 1:10, or 350 fifths of a second. A 1% change change in track speed means a difference of 3.5 fifths, or 3.5 points and that was, in fact, about the amount the track changed on Breeders Cup day.
Again, I refer anyone who wants to know more to my post of 5/2/00.
TGJB
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