Zelocity Clubspeed

[Clubfitter73]

So I started with the clubspeed. First stap is to see if the
calculations need improvement.

I tested 221 shots.... euh 222 shots but deleted 1 because it's
deviation was too extrem.

Average deviation from the TM measured clubspeed : -1.0 mph. That
doesn't look to bad, however when looking at this value in detail :

All shots are within +11.7 mph / -14.5 mph !

57% of the shots are within +/- 2.5 mph
48% of the shots are within +/- 2.0 mph
36% of the shots are within +/- 1.5 mph
26% of the shots are within +/- 1.0 mph
13% of the shots are within +/- 0.5 mph
5% of the shots are as measured by the TM


Please note that that 2.5mph deviation is for all clubspeeds in these
shots. This test set has clubspeeds between 110mph and 47 mph. In
precentage the purelaunch is between 18% to high and 24% to low with
it's values for clubspeed.

[Clubfitter73]

Update : Clubdata is very weird and doesn't for now make any sense. I
decided to buy a special doppler radar calibration tool. That tool
will allow me to set a speed and the see what the purelaunch has
measured.

Keep you informed.

[Ron Tonnessen]

Thanks Frans...

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[Clubfitter73]

On 8 mrt, 13:45, Clubfitter73 <miep...@gmail.com> wrote:
>
> All shots are within +11.7 mph / -14.5 mph !
>
> 57% of the shots are within +/- 2.5 mph
> 48% of the shots are within +/- 2.0 mph

> 26% of the shots are within +/- 1.0 mph

> 5% of the shots are as measured by the TM
>

The calibration tool is not here yet. Interim results from a new
calculation

All clubspeeds within +10mph / -8 mph

7% of the clubspeeds are the same as measured by the TM
33% of the clubspeeds are within +/- 1.0 mph
52% of the clubspeeds are within +/- 2.0 mph
71% of the clubspeeds are within +/- 3.0 mph
82% of the clubspeeds are within +/- 4.0 mph
90% of the clubspeeds are within +/- 5.0 mph
95% of the clubspeeds are within +/- 6.0 mph

[Ron Tonnessen]

Frans
A step in the right direction...thanks.  BTW I am put in mind of a song (I believe from the 60's) entitled "The Tighten Up"by Archie Bell and the Drells.  There was an associated dance....no video evidence available thank goodness.
Cheers
Ron

[Clubfitter73]

Yes! Yesterday the calibration tool arrived! With some luck I will
have some spare time today to do some tests. I will post those first
tests here.

[Clubfitter73]

>
> Yes! Yesterday the calibration tool arrived! With some luck I will
> have some spare time today to do some tests. I will post those first
> tests here.

Did some 44 tests but I'm still trying to understand the results. But
I know for sure I have some time tomorrow.....keep you informed

[Ron Tonnessen]

Thanks for the update Frans...

[Clubfitter73]

>
> > All shots are within +11.7 mph / -14.5 mph !
>
> > 57% of the shots are within +/- 2.5 mph
> > 48% of the shots are within +/- 2.0 mph
> > 26% of the shots are within +/- 1.0 mph
> > 5% of the shots are as measured by the TM
>

> Interim results from a new calculation
>
> All clubspeeds within +10mph / -8 mph
>
> 7% of the clubspeeds are the same as measured by the TM
> 33% of the clubspeeds are within +/- 1.0 mph
> 52% of the clubspeeds are within +/- 2.0 mph
> 71% of the clubspeeds are within +/- 3.0 mph
> 82% of the clubspeeds are within +/- 4.0 mph
> 90% of the clubspeeds are within +/- 5.0 mph
> 95% of the clubspeeds are within +/- 6.0 mph

New calculations :

14% of the clubspeeds are the same as measured by the TM
38% of the clubspeeds are within +/- 1.0 mph
56% of the clubspeeds are within +/- 2.0 mph
69% of the clubspeeds are within +/- 3.0 mph
81% of the clubspeeds are within +/- 4.0 mph

90% of the clubspeeds are within +/- 5.0 mph

96% of the clubspeeds are within +/- 6.0 mph

Most likely I will release new beta this weekend. That Beta will also
show pre-impact clubspeed.

[Clubfitter73]

Ok. Clubspeed data is more clear now. The PureLaunch will measure
clubspeed but has a deviation for each measurement of around +/-
10mph. When using a consistant moving object (the calibration tool) it
is possible to use all points (between 35-80 points) measured to
calculate an average. That rather simple calculation will produce a
clubspeed which will be within 1% of the real value.

However, where the calibration tool produces a radar image of a moving
object with a consistant speed in real life the club has almost never
a consistant speed. In fact it can accelerate AND deccelerate before
impact (like when fitting the mat before the ball). Due to this unknow
"pattern" a simple average calculation is not possible.

An other issue is that Zelocity decided to not include the full moment
of the impact in the data. So the calcualtion has to "guess" when the
impact really happend. If before impact the club is really
accelerating but we stop calculation to early we will "measure" a
speed which it to slow, when we continue the calculation for to long
we will measure a speed which will be to high. IMHO the firmware for
the PureLaunch should be re-written to include the impact data thus
creating more chance to improve calculations

In the next beta I will include clubspeed data before impact in a
graph. It will explain the issue more clearly then I can do using
words :-)

[Ron Tonnessen]

Frans
Thanks for your expertise, perseverance and help.
Cheers
Ron