[NSRCA-discussion] db Rules

Wed May 20 09:16:06 AKDT 2009

Guys,

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

Mike

On Wed, May 20, 2009 at 11:06 AM, J N Hiller <jnhiller at earthlink.net> wrote:

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