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Direct speed calculations using the USAC recorded elapsed time averages for the two way runs on October 23, 1970:
3600 (time constant) = 3600 seconds/hour
Mile distance: (5.739 + 5.829)/2 = 5.784 seconds average
3600/5.784 seconds = 622.407 mph
Kilometer distance: (3.554 + 3.543)/2 = 3.5485 seconds average
3600/3.5485 seconds = 1014.513 km/h
Converted speed calculations from the direct speed calculations, using 6 significant figures:
Mile distance: 622.407 mph X 1.60934 = 1001.667 km/h
Kilometer distance: 1014.513 km/h X 0.621371 = 630.389 mph
Mayoman,
You may be forgetting that the FIA don't calculate like most of us.
Here is my educated guess at how they arrive at the official records.
Mile distance: (5.739 + 5.829)/2 = 5.784 seconds average
3600/5.784 seconds = 622.407 mph
(622.4066 rounded up to 622.407 to 3 decimal places - so far, so good)Kilometer distance: (3.554 + 3.543)/2 = 3.5485 seconds average
(rounded down to 3.548 to 3dp) 3600/3.548 seconds = 1014.
6561 km/h (rounded down to 1014.656 to 3dp)Converted speed calculations from the direct speed calculations, using 6 significant figures:
Mile distance: 622.407 mph X 1.60934
4 = 1001.
6669 km/h (rounded up to 1001.667 to 3dp)
Kilometer distance: 1014.
656 km/h X 0.621371
192 =
630.478 mph
From my experience, understanding how the published speeds have been derived can be very difficult. Not helped by the algorithm apparently changing over the years.