X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qw-out-2122.google.com ([74.125.92.25] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3864342 for flyrotary@lancaironline.net; Thu, 24 Sep 2009 08:42:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.92.25; envelope-from=rwstracy@gmail.com Received: by qw-out-2122.google.com with SMTP id 8so360002qwh.25 for ; Thu, 24 Sep 2009 05:42:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to :content-type; bh=ugplevmUTb20kmqJo+O1XNDQ2h1iZQRfzFHBtRMQjds=; b=mleQD0ZEGq5zyhAYxUjwxiHJGpsmO5awV8UYnYeDXkcFFbL/PEh+v5BAuHAt7RpI1Z fxIbsRcMhFJ11BnqYqaukZwWVtEoR52d8M2AYKh0DR2w/aKHhJXqNPbloZm7Ll1Ug+BY IQVY9rvww9U/xpO9s1zoV1v2E+OF7auwFvi+U= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=te2Xn7KmL/PNS2I/lxqZuYB93AxWnKTf21X5OHwe7J6cZ0ts1pcaZVfhaahsdKh5hf 2+hkXpPfU5J82UxoLIiIGC/EUwP78fy6+XsB7BOFR1CmDyXx1H2NuMqthKp/4trMKElF 7l+LC5VWhvuaXTzQ4EWkc1LIjAnuVSV8LX9Cg= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.81.132 with SMTP id x4mr3134125qak.163.1253796136557; Thu, 24 Sep 2009 05:42:16 -0700 (PDT) In-Reply-To: References: Date: Thu, 24 Sep 2009 08:42:16 -0400 X-Google-Sender-Auth: 8f51156454198bb4 Message-ID: <1b4b137c0909240542p975514ds6034c858bb72a2f1@mail.gmail.com> Subject: Re: [FlyRotary] Re: Noise reduction (was) nothing to report From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000feaedef9f571e9a04745229e0 --000feaedef9f571e9a04745229e0 Content-Type: text/plain; charset=ISO-8859-1 With today's technology, ANR only works at low frequencies. All attenuation at higher freqs is passive by virtue of the physical design of the headset. I use Bose but never tried the in-ear type. Flight without ANR in most experimentals is just not pleasant no matter what engine you have. Tracy (getting closer on RV-8 cooling but off to Colorado tomorrow) On Wed, Sep 23, 2009 at 11:40 PM, Mike Wills wrote: > Thanks for the info. The website emphasizes effectiveness at low freqs. I > wonder how they handle the higher freqs? Not clear how well these would work > with the rotary. > > Mike Wills > RV-4 N144MW > > ----- Original Message ----- From: "Phil White" > To: "Rotary motors in aircraft" > Sent: Wednesday, September 23, 2009 11:20 AM > Subject: [FlyRotary] Noise reduction (was) nothing to report > > > Mike, Mark; and all you going deaf with noisy Rotary engines: >> I have 2 sets of Halo Tubephones from Quiet Technologies, that provide >> about 30 dB of quieting at 125 Hz, and up to 45 dB at 4,000 Hz and higher. >> They sell for $360 each at www.quiettechnologies.com, or their booth at >> OSH. >> >> Not connected in any way to them. Just a satisfied customer, especially >> after flying with my brother who was using his $1,000 Bose headset. We >> swapped, and both of us found the light Tubephones to be quieter and more >> comfortable. >> >> Phil >> RV-10 20B in Downers Grove, IL engine + cowling on, lotsa plumbing + >> wiring to go >> >>> >>> Subject: >>> Re: [FlyRotary] nothing to report... >>> From: >>> Mark Steitle >>> Date: >>> Mon, 21 Sep 2009 07:26:25 -0500 >>> >>> >>> Good report Mike. I know what you mean about a quieter muffler. My ANR >>> headset does a good job of killing the low frequencies, but a poor job on >>> the higher frequencies. The rotary has both. So take your pick, turn the >>> ANR on and listen to the high frequencies, or turn it off and listen to the >>> low rumble. If I could only find an ANR that can do both I would be a happy >>> camper. Mark >>> >>> On Sun, Sep 20, 2009 at 10:55 PM, Mike Wills >> rv-4mike@cox.net>> wrote: >>> >>> I added another 1.3 hours to my total flight time today. And for >>> the first time I landed and was completely satisfied with the >>> flight. I'd still like to quiet it down a little, but this was the >>> first flight where I didnt feel like there was anything that had >>> to be fixed before the next flight. Even the landing was pretty >>> decent. >>> I've got just over 9 hours of flight time and about 40 hours of >>> engine run time now. So far all of my flight time has been >>> directly over the airport because to venture away requires flying >>> over about 50 miles of mostly unlandable mountainous terrain. But >>> I'm starting to think seriously about stretching the legs a little... >>> Mike Wills >>> RV-4 N144MW >>> >>> >>> >>> ------------------------------------------------------------------------ >>> >>> Subject: >>> Re: [FlyRotary] Re: nothing to report... >>> From: >>> Steve Thomas >>> Date: >>> Mon, 21 Sep 2009 07:41:57 -0700 >>> >>> >>> Mark, >>> >>> Which ANR do you use? >>> >>> Best Regards, >>> >>> Steve Thomas >>> _______________________________________________________ >>> >>> >>> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --000feaedef9f571e9a04745229e0 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable With today's technology, ANR only works at low frequencies.=A0 All atte= nuation at higher freqs is passive by virtue of the physical design of the = headset.=A0=A0 I use Bose but never tried the in-ear type.=A0 Flight withou= t ANR in most experimentals is just not pleasant no matter what engine you = have.

Tracy=A0 (getting closer on RV-8 cooling but off to Colorado tomorrow)<= br>
On Wed, Sep 23, 2009 at 11:40 PM, Mike Wi= lls <rv-4mike@cox.= net> wrote:
Thanks for the in= fo. The website emphasizes effectiveness at low freqs. I wonder how they ha= ndle the higher freqs? Not clear how well these would work with the rotary.=

Mike Wills
RV-4 N144MW

----- Original Message ----- From: "Phil White" <philwhite9@aol.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, September 23, 2009 11:20 AM
Subject: [FlyRotary] Noise reduction (was) nothing to report


Mike, Mark; and all you going deaf with noisy Rotary engines:
=A0 I have 2 sets of Halo Tubephones from Quiet Technologies, that provide= about 30 dB of quieting at 125 Hz, and up to 45 dB at 4,000 Hz and higher.= They sell for $360 each at www.quiettechnologies.com, or their booth at OSH.

=A0 Not connected in any way to them. =A0Just a satisfied customer, especi= ally after flying with my brother who was using his $1,000 Bose headset. = =A0We swapped, and both of us found the light Tubephones to be quieter and = more comfortable.

Phil
RV-10 20B in Downers Grove, IL =A0engine + cowling on, lotsa plumbing + wir= ing to go

Subject:
Re: [FlyRotary] nothing to report...
From:
Mark Steitle <ms= teitle@gmail.com>
Date:
Mon, 21 Sep 2009 07:26:25 -0500


Good report Mike. =A0I know what you mean about a quieter muffler. =A0My AN= R headset does a good job of killing the low frequencies, but a poor job on= the higher frequencies. =A0The rotary has both. =A0So take your pick, turn= the ANR on and listen to the high frequencies, or turn it off and listen t= o the low rumble. =A0If I could only find an ANR that can do both I would b= e a happy camper. Mark

On Sun, Sep 20, 2009 at 10:55 PM, Mike Wills <rv-4mike@cox.net <mailto:rv-4mike@cox.net>> wrote:<= br>
=A0 =A0I added another 1.3 hours to my total flight time today. And for =A0 =A0the first time I landed and was completely satisfied with the
=A0 =A0flight. I'd still like to quiet it down a little, but this was = the
=A0 =A0first flight where I didnt feel like there was anything that had =A0 =A0to be fixed before the next flight. Even the landing was pretty
=A0 =A0decent.
=A0 =A0 I've got just over 9 hours of flight time and about 40 hours o= f
=A0 =A0engine run time now. So far all of my flight time has been
=A0 =A0directly over the airport because to venture away requires flying =A0 =A0over about 50 miles of mostly unlandable mountainous terrain. But =A0 =A0I'm starting to think seriously about stretching the legs a lit= tle...
=A0 =A0 Mike Wills
=A0 =A0RV-4 N144MW



------------------------------------------------------------------------
Subject:
Re: [FlyRotary] Re: nothing to report...
From:
Steve Thomas <glasa= ir2@me.com>
Date:
Mon, 21 Sep 2009 07:41:57 -0700


Mark,

Which ANR do you use?

Best Regards,

Steve Thomas
_______________________________________________________



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