The D format in speed event is how they separate the class for pay out. Each division is based off the fastest time.
So the fastest time for that class wins the 1D. Then depending on entries that 1D may pay for places. Then the 2D is .5 seconds slower then the 1D time. That is the 2D division and again depending on entries may pay to 4 places. Then you add 1 second on to the 1D time and you get your 3D time and it pays to 4 places. However each division may only pay to 2 places may pay to 6. Each is different.
So lets say that the fastest score is 17 seconds. That is you 1D time. So the 2D starts at 17.5 and the 3D starts at 18 seconds. So first is 17 next could be 17.011 next could be 17.1 then say 17.25 and then 17.3 and then 17.45. These are all 1D times but if it only pays to 4 places then the 17.3 and the 17.45 will get nothing but now lest say the next fastest time is 17.52. They now win the 2D and get paid and so on.
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