<br><font size=2 face="sans-serif">John</font>
<br>
<br><font size=2 face="sans-serif">To add to Lance's experience (he and
I authored that specific noise rule) most of the loud boys start out having
no idea how loud they really are. 103dB is real easy to obtain ,
almost all of our planes are under 100. 3dB = 2X loud. The "A"
weighting discards any sound below 500mhz. This is important as "bass"
does not irritate but can easily place you over the limit. 1000 to 4000
is the most irritating to Mr Bob Complainer. This brings up problem #2
which is large supersonic prop tips. Guess what frequency they pop at???
right at 1000-2000 and now matter how quiet on the ground the plane is,
a supersonic prop in a dive will not only piss off the neighbors but club
members too. We dealt with this by limiting prop size...that is making
the IMAC type planes go to 3 blades. You cannot believe the grief I got
by putting this in place....a guy spends over $5000 on his plane and then
bitches about having to buy a $150 prop. He ended up selling his whole
rig...plane, 5th wheel to haul it and all. The prop issue is much more
contrversial, and harder to regulate. Our rules state "no supersonic
props" so if at the field and you hear it any club member can ask
that person to stop flying. How to enforce that I do not know but luckily
the rules alone got rid of all the problems...that is, nearly all those
people quit, which was not the intention, but hey......we still have our
field and only one psychotic lady to deal with-and the County/Judges on
our side.</font>
<br>
<br><font size=2 face="sans-serif">We never have to check now. Like Lance
mentioned if someone brings out a plane above 103dB you will know it immediately.
By the way the IMAC planes 4 years ago were 107-108 dB at 10 feet WITH
supersonic props while flying. That is about 3.4 times louder than
a pattern plane plus prop noise.</font>
<br>
<br><font size=2 face="sans-serif">A wise Vulcan once told me "The
needs of the many outweigh the needs of the few", or something like
that.....</font>
<br><font size=2 face="sans-serif"><br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radome and Composites Engineering<br>
Raytheon</font>
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<td width=40%><font size=1 face="sans-serif"><b>"Lance Van Nostrand"
<patterndude@comcast.net></b> </font>
<br><font size=1 face="sans-serif">Sent by: nsrca-discussion-bounces@lists.nsrca.org</font>
<p><font size=1 face="sans-serif">06/19/2006 10:30 PM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
NSRCA Mailing List <nsrca-discussion@lists.nsrca.org></font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">"NSRCA Mailing List" <nsrca-discussion@lists.nsrca.org></font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [NSRCA-discussion] Noise rules</font></table>
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<br><font size=2 face="Arial">John,</font>
<br><font size=2 face="Arial">I've been part of setting noise limit in
2 clubs. One because I was an officer and we put them in place just
in time because when the complaint came in the town saw that we were being
proactive. In the second, I got roped in because I had "experience".
I've got the same sound meter that they use at nats. First
rule is to get a great meter and spend the money. You don't want
to make a rule that limits a persons flying if, when you go to enforce
it, the defensive pilot points out the uncertainty of your equipment. McMaster
Carr has a +- 1Db meter, which is as good as you can get. Its self
calibrating too, which is important since it will probably be stored at
your field in the cold and hot.</font>
<br><font size=3> </font>
<br><font size=2 face="Arial">Second: I 've measured tons of planes from
close and far, upwind and down and talked to observers. You must
not succumb to claims that you can measure from 25 feet (or more) and get
reliable results. Way too many variables. Measer from 10 feet
at a consistent location. use A weighting, slow response to average
the results.</font>
<br><font size=3> </font>
<br><font size=2 face="Arial">Third: after doing this twice with different
observers 103dB limit (10 feet over hard surface) is reasonable. Thisis
where both clubs ended up. It is a lenient threshold that few planes
will exceed, but when they do you and everyone will know it. If the
law still complains you can lower it, but no one will say you are being
too restrictive with this. Even the loud boys will agree, but they'll
probably violently oppose the concept of a noise rule.</font>
<br><font size=3> </font>
<br><font size=2 face="Arial">--Lance</font>
<br><font size=3> </font>
<br><font size=3>----- Original Message ----- </font>
<br><font size=3><b>From:</b> </font><a href=mailto:johnferrell@earthlink.net><font size=3 color=blue><u>John
Ferrell</u></font></a><font size=3> </font>
<br><font size=3><b>To:</b> </font><a href="mailto:nsrca-discussion@lists.nsrca.org"><font size=3 color=blue><u>NSRCA
Mailing List</u></font></a><font size=3> </font>
<br><font size=3><b>Sent:</b> Monday, June 19, 2006 8:08 PM</font>
<br><font size=3><b>Subject:</b> [NSRCA-discussion] Noise rules</font>
<br>
<br><font size=2 face="Arial">If someone out there has a set of noise rules
for a general purpose RC club? Especially a set that works. </font>
<br><font size=3> </font>
<br><font size=2 face="Arial">I cannot expect the masses to conform to
pattern numbers, but I need something to start with. "Reasonable"
does not seem to mean the same thing to every one. </font>
<br><font size=3> </font>
<br><font size=3> </font>
<br><font size=2 face="Arial">John Ferrell W8CCW<br>
"My Competition is not my enemy"</font><font size=2 color=blue face="Arial"><u><br>
</u></font><a href=http://dixienc.us/><font size=2 color=blue face="Arial"><u>http://DixieNC.US</u></font></a>
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