56. Renties Ypres Rally Belgium 2021

[Mirek]

go figure...

The photo does not correspond with the all live footage (which corresponded with the tweet you posted earlier). Either the speedgun was wrongly calibrated or the wrc plus footage was wrongly calibrated (don't know what is the source of the data there but it's not GPS for sure).

[tommeke_B]

Had an amazing event. First time (and probably last time) seeing these extreme cars on my home event, packed with action. Great shakedowns and good action on all 3 competition days. The WRC cars were stunning to see. I've seen these cars plenty of times, also in Croatia earlier this year. But seeing them on roads I know so well helped me to put in perspective how crazy they are. I think both crashes of Fourmaux and especially Katsuta could be some kind of warning, that these cars are probably beyond the limit for tarmac. The line between being in a position where you can see some action, and being in danger, is thinner than ever before. Fortunately there seemed to be less spectators than usual in Ypres. Rally2-category was a bit boring to see after the WRC cars, probably due to the big difference in the cars themselves, and perhaps a bit due to slightly weaker entry field (with all respect to those who participated). Nearly all foreign RC2-drivers were discovering the event, so there's not much more they could do. Also, sadly my prediction of at least 3 of the 5 WRC2-drivers going off became reality. The junior category was, very entertaining to see, despite a solid win from Armstrong who seemed to be more confident than anyone else.

A few photos:











A few more: https://www.facebook.com/media/set?v...99647850047047

[dimviii]

The photo does not correspond with the all live footage (which corresponded with the tweet you posted earlier). Either the speedgun was wrongly calibrated or the wrc plus footage was wrongly calibrated (don't know what is the source of the data there but it's not GPS for sure).

Thats why I posted the photo
We have yo take with a pint of salt these info about top speeds


@Tom amazing photos mate!

[dimviii]

guys watch the flying wheel how close to camera man was

[MartijnS]

You see there is a full car in front of the wheel haha? Just kidding.

[BigWorm]

The photo does not correspond with the all live footage (which corresponded with the tweet you posted earlier). Either the speedgun was wrongly calibrated or the wrc plus footage was wrongly calibrated (don't know what is the source of the data there but it's not GPS for sure).

Onboard (WRC+) of Hyundais on Franchorchamps 2 is not corresponding with that photo or all live either!

[Fast Eddie WRC]

Official speed guns like used by the police have to be calibrated very regularly to be truly accurate.

[denkimi]

Official speed guns like used by the police have to be calibrated very regularly to be truly accurate.

And even the speed guns of the police have a rather big margin of error.

Only gps speeds should really be trusted.

[dupanton]

Martijn Wydaeghe said in a podcast after the rally, that the topspeeds on WRC+ are not reliable. He says that in reality, they go near the 200km/h.

[Mirek]

And even the speed guns of the police have a rather big margin of error.

Only gps speeds should really be trusted.

Police radars are usually under +/- 3 km/h (at least here). That's not a big margin of error and it's not worse than GPS.

GPS speed is not accurate. GPS has large latency, limited position accuracy and very bad accuracy in vertical (i.e. when the road leads uphill or downhill it can not correctly count the real distance you drove during the signal period). It's accurate basically only when the speed is high and constant over a certain period of time. For dynamic driving where you accelerate and brake and nothing in between it is useless. It is also useless when you drive really slow. Basically the faster you move the lower GPS error (because it comes from the position accuracy which is usually around +/- 6 meters). When you walk GPS gives total bullshit speed numbers which is normal. With rising speed that bullshit gets more reasonable.

The most accurate measurement of speed is via optical or radar sensors mounted on the car itself (those tubes pointed on the ground you see during testing). The stationary radars are second best, if well calibrated (there are more precise ones than those used by police as well).