ORIGINAL: abel_pranger
ORIGINAL: cyclops2
BINGO!!!
I now know why people near our fields complain.
No plane excedes the DB limit. True. Times 6 of them up there is, 6 X louder and being high up spreads the noise over the noise absorbing trees and bushes.
Duuh. How do we solve that part of the problem Boss ?
cyclops2-
The sound sources (different models) are uncorrelated. In that case, each doubling in the number of sources increases the resultant level by 3 dB, assuming the different sources are equal in level. For six sources, that works out to a resultant about 8 dB greater than each contributing source. It is important to consider this in calculating the sound levels your club site as a whole is emitting. A club noise abatement rule should include the number of models allowed to operate simultaneously.
Abel
p.s.: Re
www.nonoise.org, consider it a valued resource, even if you only view it in the "know thine enemy" sense. There is a lot of useful info in and linked to that site that can help you get along with neighbors, and if necessary to mount a defense against unreasonable ones.
Now this IS a good idea. Know thy enemy .
So far we have identified several issues in this thread. One issue, some folks are dealing with is vague and subjective noise laws. These clubs are, in my opinion at greatest risk of being subjected to harassing complaints, valid or invalid.
The 90db muffler concept was introduced during my time in this hobby. Perhaps, we as consumers can voice our interest in even quieter engines to the manufactures. It would be in the manufactures interest to help preserve the market for their products.
I owned a Jetski a few years ago. It was powered by a two cycle engine. During the 6 years that I owned the Jetski, I learned that many people living along lakeshore property found the noise made by these machines offensive. Many lakes around the counrty banned or restricted the use of Jetskies because they were loud. Often the charge against the Jetskies was that they polluted too much. The market responded. Honda produced a 4 cycle powered Jetski that was quieter and cleaner.
I believe our hobby can respond just as the Jetski sport responded. We must make people aware that noise is an issue. We can find quieter engines such as 4 cycles. We can reduce the number of planes permitted to fly at one time.
We must meet this challenge head on. We must be responsible and good neighbors in our communities.
And as for knowing thy enemy : It would not be a very bad idea to monitor or even join organizations formed around the issue of noise pollution. Perhaps a voice from within could penetrate their discussions and even steer them in a reasonable path albeit covertly.
Nothing stays the same. We are all old enough to know that change happens. We must examine our own ability to modify our behavior as our environment changes. If/as noise becomes a larger and more pressing issue, we must fight for our rights while at the same time we must adjust to the ever changing "reasonable" person's concept of unreasonable noise. With time and urban sprawl will we soon be face to face with that "reasonable" person.