On a similar vein... What's with the "you can't start your bike before 9:00 am " at Donny? Meanwhile the planes are coming in and taking off almost 24/7 ?? Bonkers, or am I missing something...?
Yes pal, there is a noise monitor in pit lane. If any bikes are started before 9AM then it flags up at the local council office so they know the circuit are not policing it. I've never quite worked out how they differentiate between people arriving on road bikes and bikes being run ready for circuit use but that's why someone will come around and tell you to turn your bike off. I'm sure some of the locals must complain about the planes too but you'll always get a few. The circuit noise meters are continually linked to the council so they know if bikes are breaching the agreed noise level, hence you get black flagged. To be fair I think Donny has it spot on at the minute with a common sense approach to noise. No static noise test and a two black flag rule before you go home means you know exactly where you stand. They even suggested I might like to try running with my baffles out of the Pani one day as they know the Termis are louder with them in. They were already out so I just backed it off a bit as it was a 98db day and I didn't want to go home.
Measuring sound and listening to it are 2 different things, our hearing is not linear we only perceive equal loudness of frequencies at approx 98dB, above that level low and high frequencies are exaggerated and as loudness reduces low & high frequencies seem lower than they actually are, we are most sensitive to frequencies in the 3 to 4 kHz bandwidth ( unsurprisingly the area where a baby's cry is centred ) for a full/better explanation Google Fletcher Munson curves. When actually measuring sound you will see that levels reduce very linearly and in the "far field" it falls off at a rate of 6dB for every doubling of distance from source that you take a measurement. Low frequencies are the least affected but high frequencies reduce more due to obstacles and air absorption. So buy a screaming stroker
Have been a victim of failed noise test at Oulton park so I feel the pain, but, and I hate to say it if we don't comply to the rules ( most tracks are around 102db nowadays) we wont have any tracks to play superbike heroes on! And nope I don't do noise testing for MSV before thats thrown at me. I do not, however want to see Mallory park situations appearing regularly through out the country! Maybe local residents, some of whom likely make money from living next to a Motorsport event facility should re consider buying a fecking house within hearing distance of a Motorsport track. Then there would be no issues.... Go abroad and see how the track days should be run, not a noise test in sight at Jerez awesome!
