Guys,<br><br>Just returned from flying . Quiet flyers can start at 8:00 am now, use to be 10:00 am.I have to find out at what distance they are measuring from? Thanks for your help<br><br>Mike<br><br><div class="gmail_quote">
On Wed, May 20, 2009 at 11:06 AM, J N Hiller <span dir="ltr"><<a href="mailto:jnhiller@earthlink.net">jnhiller@earthlink.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
My local club went through a noise related closing back in the ballistic<br>
pattern days. Reopening involved working with the county zoning commission<br>
and reopening as a recreational airpark, or something like that, with<br>
specified hours of operation and sound level restriction (100 DBa @ 3m). As<br>
I remember there were references to sound level at the property line, yes<br>
even in rural areas, which cover all type of activities with time if day<br>
references. City and county sound limits may already exist and can be used<br>
as a guideline or reference when negotiating with whomever.<br>
Quiet fliers shouldn't be offensive beyond the immediate area but the<br>
average 40+ size sport flier turning umpteen RPM's can be annoying even if<br>
it's DB level is within limits.<br>
In quieting the piped 60 I was running in the old AMA pattern I found the DB<br>
level to be proportional to RPM's. Encourage / help the club members to run<br>
larger props.<br>
Jim Hiller<br>
<div class="im"><br>
<br>
-----Original Message-----<br>
From: <a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a><br>
</div><div><div></div><div class="h5">[mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>]On Behalf Of Ron Van Putte<br>
Sent: Wednesday, May 20, 2009 8:30 AM<br>
To: General pattern discussion<br>
Subject: Re: [NSRCA-discussion] db Rules<br>
<br>
That's highly unlikely. Very few, if any, internal combustion<br>
engines and even few electric-powered airplanes could meet a noise<br>
standard of 78 dB at three meters. The sound pressure level doubles<br>
every six dB, so 78 dB is 1/8 the sound pressure level of 96 dB.<br>
That's about the level of a mouse burp.<br>
<br>
Ron<br>
<br>
On May 20, 2009, at 10:20 AM, Duane Beck wrote:<br>
<br>
> I hit send too quickly. I meant to suggest that perhaps they're<br>
> using the same distance.<br>
><br>
><br>
> Duane<br>
><br>
><br>
> ----- Original Message -----<br>
> From: "Duane Beck" <<a href="mailto:duane.e.beck@comcast.net">duane.e.beck@comcast.net</a>><br>
> To: "General pattern discussion" <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
> Sent: Wednesday, May 20, 2009 11:12:23 AM GMT -05:00 US/Canada Eastern<br>
> Subject: Re: [NSRCA-discussion] db Rules<br>
><br>
><br>
> p { margin: 0; }<br>
> "...shall be 96 decibels measured at three (3) meters from the<br>
> center line of the model..."<br>
><br>
><br>
> ----- Original Message -----<br>
> From: "Bob Kane" <<a href="mailto:getterflash@yahoo.com">getterflash@yahoo.com</a>><br>
> To: "General pattern discussion" <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
> Sent: Wednesday, May 20, 2009 10:10:38 AM GMT -05:00 US/Canada Eastern<br>
> Subject: Re: [NSRCA-discussion] db Rules<br>
><br>
><br>
> <!-- DIV {margin:0px;} --><br>
> Do they have a distance parameter defined? The dB number by itself<br>
> is meaningless.<br>
><br>
> Bob Kane<br>
> <a href="mailto:getterflash@yahoo.com">getterflash@yahoo.com</a><br>
><br>
><br>
> From: Scott Pavlock <<a href="mailto:f3aflyer7@gmail.com">f3aflyer7@gmail.com</a>><br>
> To: General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
> Sent: Wednesday, May 20, 2009 8:19:03 AM<br>
> Subject: Re: [NSRCA-discussion] db Rules<br>
><br>
> Bob<br>
><br>
> The club has set 78db as the standard for quiet flyers. Thanks for<br>
> the info.<br>
><br>
> Mike<br>
><br>
> On Wed, May 20, 2009 at 7:09 AM, Bob Kane <<a href="mailto:getterflash@yahoo.com">getterflash@yahoo.com</a>><br>
> wrote:<br>
> From the AMA Competition Regulations for RC Aerobatics (I removed<br>
> the text on motor type and scoring penalties)<br>
><br>
> 4.2: Noise Limit. <snip> The maximum noise level for all classes<br>
> shall be 96 decibels measured at three (3) meters from the center<br>
> line of the model with the model standing on concrete or macadam,<br>
> and 94 dB if an earth or short grass surface must be used All<br>
> measurements will be taken perpendicular to the fuselage centerline<br>
> on the right hand side of the model, with the nose of the model<br>
> aircraft pointed into the wind, with motor running at full power;<br>
> the microphone to be placed on a stand 30 centimeters above the<br>
> ground and in line with the motor. No noise reflecting objects<br>
> shall be nearer than three (3) meters to model or microphone. <snip><br>
><br>
> What actual dB number you use is up to the club. 94 dB would be too<br>
> loud for a park flyer. You might want to measure an acceptable<br>
> plane to see what the number is and use that as the standard. You<br>
> could also measure a plane considered too loud and see what it<br>
> measures. The tough thing is "loud" and "unpleasant" are not easily<br>
> related.<br>
><br>
> Bob Kane<br>
> <a href="mailto:getterflash@yahoo.com">getterflash@yahoo.com</a><br>
><br>
><br>
> From: Scott Pavlock <<a href="mailto:f3aflyer7@gmail.com">f3aflyer7@gmail.com</a>><br>
> To: NSRCA Discussion List <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
> Sent: Wednesday, May 20, 2009 7:28:05 AM<br>
><br>
> Subject: [NSRCA-discussion] db Rules<br>
><br>
> Our club has recently added more flying times for quiet flyers. But<br>
> we need to have our planes db'ed before we can fly in these new<br>
> very early hours. Where can I find a set of guidelines on how a<br>
> plane should be properly db'ed ?<br>
><br>
> Regards<br>
> Mike<br>
><br>
><br>
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><br>
><br>
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</div></div></blockquote></div><br>