X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3861823 for flyrotary@lancaironline.net; Tue, 22 Sep 2009 00:22:01 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id E6B2D173570 for ; Tue, 22 Sep 2009 12:21:20 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 3BB64BEC02E for ; Tue, 22 Sep 2009 12:21:20 +0800 (WST) Message-ID: <4E20715BDD944D02B7353DEDC04CEB8E@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: nothing to report... Date: Tue, 22 Sep 2009 14:21:20 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01CA3B8F.F497C670" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 090921-0, 09/21/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_003D_01CA3B8F.F497C670 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mike, It would most likely be a DNR ( Dynamic Noise Reduction) as opposed to = ANR (Active noise reduction). 'The DNR uses digital electronic = techniques to remove noise components from the incoming headphone = signal' - extract from Australian Flying magazine. I can give more of the extract if you want. George ( down under) One thing I did notice on this flight. Taking my feet off the rudder = pedals and placing them flat on the floor changes the vibration = characteristics of the floorboards and affects the operation of the ANR = circuit in the headset. In general I norice the ANR is much more = susceptible to being confused in the RV with the higher freq noise = environment. Previously the only time I'd ever experieinced problems with the ANR = was in my buddy's Mooney during takeoff. At full power the ANR would = cease functioning until the landing gear came up - then it would return = to normal. In the RV different power settings, even turning my head at = certain angles, confuses it. I dont recall the Zulu doing this. Probably = a more sophisticated ANR circuit in the Zulu. Mike Wills RV-4 N144MW ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Monday, September 21, 2009 5:26 AM Subject: [FlyRotary] Re: nothing to report... 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. =20 Mark On Sun, Sep 20, 2009 at 10:55 PM, Mike Wills = 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 ------=_NextPart_000_003D_01CA3B8F.F497C670 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Mike,
It would most likely be a DNR ( Dynamic = Noise=20 Reduction) as opposed to ANR (Active noise reduction). 'The DNR uses = digital=20 electronic techniques to remove noise components from the incoming = headphone=20 signal' - extract from Australian Flying magazine.
 I can give more of the extract if = you=20 want.
George ( down under)
 
 
One thing I did notice on this = flight. Taking=20 my feet off the rudder pedals and placing them flat on the floor changes = the=20 vibration characteristics of the floorboards and affects the operation = of the=20 ANR circuit in the headset. In general I norice the ANR is much more = susceptible=20 to being confused in the RV with the higher freq noise = environment.
 
Previously the only time I'd ever = experieinced=20 problems with the ANR was in my buddy's Mooney during takeoff. At full = power=20 the ANR would cease functioning until the landing gear came up - then = it would=20 return to normal. In the RV different power settings, even turning my = head at=20 certain angles, confuses it. I dont recall the Zulu doing this. = Probably a=20 more sophisticated ANR circuit in the Zulu.
 
Mike Wills
RV-4 N144MW
----- Original Message -----
From:=20 Mark=20 Steitle
To: Rotary motors in = aircraft=20
Sent: Monday, September 21, = 2009 5:26=20 AM
Subject: [FlyRotary] Re: = nothing to=20 report...

Good report Mike.  I know what you mean about a quieter=20 muffler.  My ANR headset does a good job of killing the low=20 frequencies, but a poor job on the higher frequencies.  The = rotary has=20 both.  So take your pick, turn the ANR on and listen=20 to the high frequencies, or turn it off and listen to the low=20 rumble.  If I could only find an ANR that can do both I would = be a=20 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=20 time today. And for the first time I landed and was completely = satisfied=20 with the flight. I'd still like to quiet it down a little, but = this was=20 the first flight where I didnt feel like there was anything that = had to be=20 fixed before the next flight. Even the landing was pretty=20 decent.
 
I've got just over 9 hours = of flight=20 time and about 40 hours of engine run time now. So far all of = my=20 flight time has been directly over the airport because to venture = away=20 requires flying over about 50 miles of mostly unlandable = mountainous=20 terrain. But I'm starting to think seriously about stretching the = legs a=20 little...
 
Mike Wills
RV-4=20 = N144MW

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