The IAAF sent us the full results for today's World Challenge meet in Dakar. You can see them here:
http://www.letsrun.com/news/2016/05/results-2016-iaaf-world-challenge-darkar-results/
The winning performance of former Louisiana Tech jumper Jarvis Gotch caught our attention. Gotch has a wind legal pb of 8.24m. He's gone 8.35 this year with a 2.7 wind helping him.
Now he's allegedly gone 8.31 but into a huge headwind??
Long Jump - Men
Wind
1 Gotch , Jarvis USA 8.31 -4.0
2 da Silva , Mauro Vinicius BRA 7.94 -4.8
3 Gueye , Mamadou SEN 7.78 -0.4
4 Frederick , Norris USA 7.71 -2.6
5 Méliz , Luis Felipe ESP 7.68 -3.1
6 Lane , Cal USA 7.62 -0.3
7 Cotter , Dylon RSA 7.60 -3.1
8 N'Tia , Romeo BEN 7.49 -1.7
Broken wind or measurement gauge? American Jarvis Gotch just won the Dakar LJ w 27' 3¼" (8.31) leap into -4m/s wind!
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You are implying he "broke wind" in order to achieve that mark? I'd love to know what his pre-meet meal was to get such a boost!
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It sounds like they just had it set up backwards, and then nobody thought to correct the sign to make it a positive (tail) wind.
Da Silva's best this year is 8.14, so I doubt he would have jumped 7.94 into a 4.8m/s headwind.
On the other hand, I would have hoped some of those guys would jump a bit farther with that massive of a tail wind.
So maybe it really is just a broken gauge? -
Baked beans with a side of garlic roasted Bussels sprouts FTW!
PEEEEWWWWW wrote:
You are implying he "broke wind" in order to achieve that mark? I'd love to know what his pre-meet meal was to get such a boost! -
He broke wind on the measuring robot and it short circuited.
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Most of the marks for the best jumps of each participant had big negative wind (-4.8, -2.6, etc.) so it is probably not a mistake. A few very good marks for the conditions. The wind reading is taken along the runway (an average over a time period; 10 seconds for the 100, not sure for the LJ) and maybe it was swirling and when they were at the pit the actual wind was not so bad.
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According to the IAAF recap, his jump was aided by a +4.0 m/s wind....So, which is it?!
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Great. Now he'll start referring to himself as a 8.31 guy.
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How much does a head wind of 3.0 mph or greater actually effect sprints/jumps?
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MeHereYouWhere?! wrote:
Great. Now he'll start referring to himself as a 8.31 guy.
His IAAF profile ever so briefly had him as an 8.31 guy. When the error in the wind reading was corrected so, alas, was the profile. Back to 8.24.
Here's video of the 8.24 PB from April. He's only 5'9". And (from his response to comment) fan friendly.
https://www.youtube.com/watch?v=2XGj7fyVaYE -
The results have been corrected:
Men's results
Long Jump - Men
Wind
1 Gotch , Jarvis USA 8.31 +4.0
2 da Silva , Mauro Vinicius BRA 7.94 +4.8
3 Gueye , Mamadou SEN 7.78 +0.4
4 Frederick , Norris USA 7.71 +2.6
5 Méliz , Luis Felipe ESP 7.68 +3.3
6 Lane , Cal USA 7.62 +0.3
7 Cotter , Dylon RSA 7.60 +3.1
8 N'Tia , Romeo BEN 7.49 +1.7 -
xcrunner6 wrote:
How much does a head wind of 3.0 mph or greater actually effect sprints/jumps?
4m/s is about 9 mph.
I would estimate a 4 m/s headwind to reduce an 8m (with no wind) jumper about 40cm. I would expect a 4m/s tailwind to help by about 25cm.
It depends on the jumper though. A "slower" jumper with lots of pop off the board (somebody like Chris Tomlinson, for example) is going to be less affected than a faster jumper with not as much height off of the board.
For the sprints, there are calculators that provide reasonable estimates. Again, it depends on the individual sprinter to some extent. But a 4m/s head or tailwind is pretty significant, it could be a .2 or .3 swing in time either way compared to 0.0 wind. -
you can get good estimate with wind-altitude calculator & square the benefit/handicap as wind helps/hinders twice : once on runway & 2ndly in the trajectory
an elite guy shoud have have near enough 6.70s basic speed
http://myweb.lmu.edu/jmureika/track/wind/index.html
from trial/error, the 60m time which with a -4m/s wind at 0 altitude which yields a basic 6.70 is 6.92s
therefore the jump with 0 wind wouda been ~
8.31 * ( 6.92/6.70 )^2 =
8.86m
so, more like 55cm handicap
for a +4m/s wind, the calculator says basic time is 6.57
therefore the jump with 0 wind wouda been ~
8.31 * ( 6.57/6.70 )^2 =
7.99
about 30cm help
