Hi!
Motorbikes at full throttle position are very loud.
What about a sound detector very close to the race track?
Use a microphone with adjustable gain so it won't be
affected by other noises like your fireworks.
Mount the microphone in a tube, to isolate unwanted noise
and make a directional microphone.
You detect the sound of the passing motorbike and after a fixed delay
you trigger the fireworks. Do that where the motorbikes are
at full throttle so that the covered distance will be always
the same and the noise very loud.
There is no need for speed/time calculation unless you trigger the
firework only for the best speed/ best laps.
Make sure that all the race participants (pilots) are aware of your fireworks
and that the generated light will not temporarily blind them.
Luciano
200 kilometer/hour = 55.5555556 meter/second
200 kilometer/hour = 5,555.5555556 centimeter/second
200 kilometer/hour = 124.2742384 mile/hour (mph)
200 kilometer/hour = 182.2688831 foot/second
200 kilometer/hour = 2,187.2265967 inch/second
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