Did anyone else notice that players were apparently hitting over 400km/h today? I wonder if speed cameras are more accurate now or are using a different way to track the speeds, or it might even be possible that they aren't calibrated properly I wonder what speeds we'll see over the next two days! Chai Biao hit a cross court for this one
One would expect hawkeye to be more accurate. As the speed measurements are also used for shuttle tracking.
Maybe the new method is able to measure the shuttle closer to when it leaves the racket... you know, like how TBH recorded the 421 kph smash with ZSlash...
hawkeye? that hawkeye that is no hawkeye at all in reality? this is all very fishy to me -.- what system do they use exactly? is that known?
Yeah that's right said it tracks and measures the highest speed that the shuttle reaches at any point so will be right off the racket like the TBH recorded one.
This is the fastest that I saw today, again from Chai Biao. Surprisingly they rarely showed the smash speeds, only on 2 or 3 occasions.
http://www.bwfbadminton.org/news_item.aspx?id=94009 Appears to be real technology this time For this purpose. Still this is not used for line calls I assume.
Surely the shuttle speed changes all the time, being at peak velocity at impact and reducing to zero when it floored or right before being bounced back in opposite direction. The fairest way to compare it must be average speed, ie v=total length travel from racket face to first impact/travel time between the two.
The TBH z-speed 420kmph record is very hard to use as comparison if it only measure near the point of impact, ie over a very small distance from racket face. I wonder BWF has a proper definition of this?
I saw something the other day that the tecnology can measure the shuttle speed at many points along its trajectory, the fastest being straight after the shuttle leaves the stringbed. I would guess a fair point of reference would be to measure the speed when the cork first passes the net vertically, and then when the tip of the feathers do, and some average is taken.
Ahh.. I see now. They use doppler effect speed gun, not start-finish over time like in traffic camera. This way it cannot measure time elapsed btw two points, bcos the dopler effect is triggered at point of impact. See answer from nousername in the following link: http://tt.tennis-warehouse.com/archive/index.php/t-252186.html Even in tennis, the speed reduces to half by the time it reach receiver.
That thread talks about a radar speed gun being used. I am pretty sure it is done with high speed camera's not radar now. The system consists of at least two high-frame-rate cameras mounted above the court (right). The shuttle at any point in its trajectory is tracked, showing the astonishing speeds at which it is hit. The tracker is customised to record a shuttle’s whole flight path and can show the speed in real time at any point along the flight path. The system can therefore identify the exact point of impact the shuttle makes with the racket by analysing the inbound and outbound track from when a shot is played. The speed at which the shuttle leaves the racket is then calculated based on this tracking data and the speed is calculated and available immediately http://www.bwfbadminton.org/news_item.aspx?id=94009 So it can tell you the speed at any point but the figures you have been seeing flash up at the India open are just off the racket. I think that is the best way to measure because if you measured it only when crossing the net, net kill or smashes from close to front court are going to be way higher in speed and be silly data. We want to know how hard they can hit it don't we? that's why the best is a consistent spot which is straight off the racket.
