PD- 50.49

AA just smashed it with 51+kn run

Jezz it would be nice to have a live video feed streaming like the PWA. They may need to do it next year.

Agreed choco. Anders now on par with A2 both on 51.34!!! Lenna 45+ too! CB now over 50 as well!

izaak said...
Anders now on par with A2 both on 51.34!!! Lenna 45+ too!

OK,is it just me, or does that sound a bit suss? This is the second time today that two people have come up with the same speed to a hundredth of a knot!
Once, maybe.......
twice? hmmmmm?.............

When we investigated using video cameras for speed timing a few years ago, one of the issues was frame rate. PAL = 25 frames a second which means you can have higher resolution than 1/25th of a second or 0.04 seconds.

Anything in between is just an estimate.

I figured they would be using at least 50 FPS if not 100 FPS.

Anyone seen any info on this?

Who is good at Math? what is the speed difference over 500m for 0.02 of a second?

Spotty said...

izaak said...
Anders now on par with A2 both on 51.34!!! Lenna 45+ too!

Incredible speeds, and a real battle going on, Patrik and Cedric now into the Five-O fold, how many others will follow????? .....the Dunk?

I'd have a few bob on Martin VM to join that club.........

Read somewhere dunky is arriving on the 20th. A2 may have just lifted the bar again!!

izaak said...
Reports of people saying A2 is up to 51.75.

Izaac r you on the fone to Antonie? HTF r u gettin all this info??

hardie said...

izaak said...
Reports of people saying A2 is up to 51.75.

Izaac r you on the fone to Antonie? HTF r u gettin all this info??

51.75, Hardie maybe Izaac is a "Indigo child"

AA 51.69

Love to see someone now plug in the original windsurfer one design board to crack 40 on it would be great recognition for the board that started it all.
A2s 2 sec was 53.42 average 52.05 500m 51.88 thought he would have gone faster
gee the run looks sweet as

choco said...
Love to see someone now plug in the original windsurfer one design board to crack 40 on it would be great recognition for the board that started it all.
A2s 2 sec was 53.42 average 52.05 500m 51.88 thought he would have gone faster
gee the run looks sweet as

Choco I'm sure Jim Drake would be proud coming from a background of speed, but I think the triangular sail would hold us back.

Incredible speeds by all, a smashing effort!

It depends if they're recording interlaced or progressive. If they're recording on fields, they will be getting 50 fields per second and doubling their accuracy.

I learned yetsterday they're using software created by Manfred Fuchs, which is approved by the WSSRC. This software uses the last image before the starting line and the next image after the starting line. Markers are set on the front of the mast base in the images and on the starting line itself and the software interpolates the positions of the mast base to know exactly when the rider passed the line. This can be done since you know the interval between two images and that the speed of the rider will not vary by too much between the images, which I think they'll have figured a worst case scenario out for.

Do the same again for the finish line and you can pretty accurately calculate the time it took from start to finish.

The only factors that would influence this are the viewing angle of the lenses used, the distance to the rider and the horizontal resolution, but I'm sure they can find a worst case scenario there and subtract it from the result just to be sure. That would still make a 25Hz PAL system pretty darn accurate.

choco said...
Love to see someone now plug in the original windsurfer one design board to crack 40 on it would be great recognition for the board that started it all.
A2s 2 sec was 53.42 average 52.05 500m 51.88 thought he would have gone faster
gee the run looks sweet as

does the start of the 500mtr. mark start at the blue flag (bottom of pic) where it becomes more broad anyone??