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<DIV>Plus or minus 6 db depending on environment. That variability is the problem.</DIV>
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<DIV class=signature id=signature>--<BR>District 6 AVP <BR>www.aeroslave.com</DIV>
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<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: "Joe Lachowski" <jlachow@hotmail.com> <BR><BR>> >From what I measured a quite a while ago, I believe the equivalent at 25 ft <BR>> to that at 10ft is about a 7db difference. <BR>> <BR>> <BR>> >From: "Lance Van Nostrand" <PATTERNDUDE@COMCAST.NET><BR>> >Reply-To: NSRCA Mailing List <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> >To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> >Subject: Re: [NSRCA-discussion] Noise rules <BR>> >Date: Wed, 21 Jun 2006 22:53:36 -0500 <BR>> > <BR>> >I'm not sure if there may be a perception that measuring at 25 feet is <BR>> >somehow more palatable than at 10 ft. If this is the feeling in your club <BR>> >then go for it. However, I know from experience that all influences on the <BR>> >measured result (wind, hard/grass, fe
nces, proximity to a covered pit echo <BR>> >chamber, cars, etc) are exponentially amplified with distance. I measured <BR>> >the same Extra330 with a large gas engine in every way possible and found <BR>> >the results varied from 101-105 db. This is a huge variation. <BR>> >Upwind/downwind in about 10 mph winds is worth 2-3 db. At 10 ft the <BR>> >variation was from 102-103 db. If you have a guy with a plane near the <BR>> >limit he may argue your measurement result. If you say the lmit is the <BR>> >highest value measured then you are really restricting some guys with loud <BR>> >planes to less than the nominal. If you provide leeway, then your limit is <BR>> >effectively raised. It opens a can of worms. <BR>> > <BR>> >Lance <BR>> > ----- Original Message ----- <BR>> > From: Glen Watson <BR>> > To: 'NSRCA Mailing List' <BR>> > Sent: Monday, June 19, 2006 10:52 PM <BR>> > Subject: Re: [
NSRCA-discussion] Noise rules <BR>> > <BR>> > <BR>> > Links below are to a RC club in the Houston market who implemented a <BR>> >noise standard.. My club has adopted the same standard. In 2004 we had <BR>> >complaints from a nearby neighbor regarding noise. Since implementing this <BR>> >noise standard we've had zero complaints. <BR>> > <BR>> > <BR>> > <BR>> > http://fortbendrc.com/ <BR>> > <BR>> > <BR>> > <BR>> > http://fortbendrc.com/Field/Field%20Noiselevel.htm <BR>> > <BR>> > <BR>> > <BR>> > Regards, <BR>> > <BR>> > <BR>> > <BR>> > ~Glen <BR>> > <BR>> > <BR>> > <BR>> > <BR>> > <BR>> > <BR>> > <BR>> > <BR>> >------------------------------------------------------------------------------ <BR>> > <BR>> > From: nsrca-discussion-bounces@lists.nsrca.org <BR>> >[mailto:nsrca-discussio
n-bounces@lists.nsrca.org] On Behalf Of John Ferrell <BR>> > Sent: Monday, June 19, 2006 8:09 PM <BR>> > To: NSRCA Mailing List <BR>> > Subject: [NSRCA-discussion] Noise rules <BR>> > <BR>> > <BR>> > <BR>> > If someone out there has a set of noise rules for a general purpose RC <BR>> >club? Especially a set that works. <BR>> > <BR>> > <BR>> > <BR>> > I cannot expect the masses to conform to pattern numbers, but I need <BR>> >something to start with. "Reasonable" does not seem to mean the same thing <BR>> >to every one. <BR>> > <BR>> > <BR>> > <BR>> > <BR>> > <BR>> > John Ferrell W8CCW <BR>> > "My Competition is not my enemy" <BR>> > http://DixieNC.US <BR>> > <BR>> > <BR>> > <BR>> >------------------------------------------------------------------------------ <BR>> > <BR>> > <BR>> > _____________________________
__________________ <BR>> > NSRCA-discussion mailing list <BR>> > NSRCA-discussion@lists.nsrca.org <BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion <BR>> <BR>> <BR>> >_______________________________________________ <BR>> >NSRCA-discussion mailing list <BR>> >NSRCA-discussion@lists.nsrca.org <BR>> >http://lists.nsrca.org/mailman/listinfo/nsrca-discussion <BR>> <BR>> <BR>> _______________________________________________ <BR>> NSRCA-discussion mailing list <BR>> NSRCA-discussion@lists.nsrca.org <BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion </BLOCKQUOTE></body></html>