0.43

0.43

0.47

0.50

0.50

0.57

0.57

0.60

0.63

0.70

0.77

0.76

1.08

1.27

1.70

1.94

2.10

Let’s say this are the ball times taken from video spin using avidemux

If we use original equation I published for FFA users

T= (0.86 x 1.08) / (2.5 x (1.08-0.86))

T=0.928 / 0.55

T=1.7s

I assume 1.7. may not be good enough since FFA was defining ACC more precisely from few rotations clocked and your timings are not so accurate.

So let’s use a full equation and to increase precision use range from 0.6 rotation to 1.08.

T is the function to define reference time for VB2

t is time duration until ball slows down from 0.6 to 1.08s. Adding rotations for this example t=0.63+0.7+0.77+0.76+1.08=3.94s

t1 is time of first ball rotation 0.6

t2 is time of last ball rotation 1.08

R is rotor time let it be around 2.5 seconds / rotation

T=( t1 x t2 x t) / (R x (t2 - t1))

In steps

T=(0.6 x 1.08 x 3.94) / (2.5 x (1.08 - 0.6)

= (2.55) / (2.5 x (0.48))

=2.55 / 1.2

T =2.12s