Calibrated serve speed measuring device

[230230]

Hello just wondering if anyone knows where in Europe it's possible to hit on a calibrated speed measuring device/system? I live in Sweden and there is not one in the whole country. Haven't been able to locate one in Finland or Estonia either. I know many coaches in these countries and still no one has been able to find one.

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Any tips? Thanks.

 

[Hagberg]

Just film yourself with good frame rate. Then count the frames (or time) from hit to bounce at service line.
V=D/t

Distance is about 18.3 m
1 frame at 60 fps = 0.0667s
1 frame at 120 fps = 0.00833s

This will get you average speed and not ball speed at contact like you see on TV. This requires radar.

However, one can approximate ball contact speed if average speed is known.
A hard serve loses about 50% speed on the way to the returners racquet.
I have seen figures of a 120 mph serve being down to about 82 mph at bounce. Calculating up until bounce seems safer because it eliminates surface differences.

Having said all this, there is nothing like immediate feedback. I live in Sweden too and haven't seen any advanced infrastructure for real time measurements.
I'm looking at devices like the pocket radar (https://www.pocketradar.com/pages/tennis) but haven't pulled the trigger. Meanwhile, I'm doing frame counting...

 

[LeeD]

Or go watch a pro tennis match and compare your serve to theirs.

 

[230230]

One well respected coach measures my serve sometimes with a serve app. He has done that with a Davis Cup member who came up to 208kmh and some other good players up to 200kmh. So far the fastest he has measured my serve is 233kmh. One former ATP pro said there is no difference to the speed of the best servers on tour. Yeah sounds good but I would like to get facts and not go around telling fishing stories...

 

[onehandbh]

One well respected coach measures my serve sometimes with a serve app. He has done that with a Davis Cup member who came up to 208kmh and some other good players up to 200kmh. So far the fastest he has measured my serve is 233kmh. One former ATP pro said there is no difference to the speed of the best servers on tour. Yeah sounds good but I would like to get facts and not go around telling fishing stories...

That is 145 mph. Not bad. How fast is your second serve?