[NSRCA-discussion] db Rules

[Scott Pavlock]

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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