Brad: “I’m not a weather man, but if you have really low pressure, under 1,000 [grams per cubic metre], you will travel a lot further on the day – anything up to one kilometre for the same power. The weather forecast for the first week in June is abnormally low pressure for London for that time of year, which is fantastic.”
Me: "grams/cubic metre" is density not pressure. Pressure is measured on Pascals (N/m^3). Brad, I hope you and your team use the correct units when setting your ride schedule.
Morbius wrote:One weather site (metcheck.com) is predicting 1032mb air pressure, which doesn't look good for 55km.
Anyway, a rather basic question. How do they calculate the final distance? The only attempt I have watched was Sarah Storey's, and I expected a gun after an hour. Instead she did a final lap, which would mean they calculate the distance based on an average speed over that last lap. Is that right?
Alex Simmons/RST wrote:
The distance = (number of complete laps x lap distance) +
(lap distance x time remaining at start of incomplete lap / time taken for final completed lap)
e.g. say rider on a 250m track crossed line at 59:50 elapsed and could not complete another full lap before 60-min had expired, and their final fully complete lap was completed in 16.000 seconds and that was their 200th complete lap.
Their distance would be 0.250km/lap x (200 laps + 10sec/16sec) = 50.156km
Distances are calculated to the nearest metre.
Morbius wrote:One follow up question: Do they fire a gun to indicate the last lap, and what happens if the rider is approaching the line with say 15 seconds to go, when there would be doubt over whether the lap would be the last one or whether the rider might cross the line once more before the hour is up.
Shame wrote:Here's results from the World Championships 4K Pursuit:
1 Bobridge avg. 56.201
2 Kueng avg 55.991
3 Serov avg 55.537
WIGGINS avg 55.526 (60 minutes instead of 4)
4 Morice avg 55.452
5 Tennat avg 55.228
6 Thiele avg 55.019
55 K is 4:21.818 every 4k.
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