X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from willowsprings.uwyo.edu ([129.72.10.31] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3876796 for flyrotary@lancaironline.net; Tue, 06 Oct 2009 18:16:33 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht2.uwyo.edu (ponyexpress-ht2.uwyo.edu [10.84.60.209]) by willowsprings.uwyo.edu (8.14.2/8.14.2) with ESMTP id n96MFs9M017152 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO) for ; Tue, 6 Oct 2009 16:15:55 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from Boesexps (172.26.4.6) by uwmail.uwyo.edu (10.84.60.199) with Microsoft SMTP Server id 8.1.393.1; Tue, 6 Oct 2009 16:15:54 -0600 From: sboese To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Mystery Radio Noise Date: Tue, 6 Oct 2009 16:15:46 -0600 Message-ID: <0FBDE51103654187AD5558DC53489766@gg.uwyo.edu> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006F_01CA46A0.42DA39B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 ------=_NextPart_000_006F_01CA46A0.42DA39B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bobby, =20 Is it possible that you were on a westerly heading and only when you = pitched down, direct sunlight was passing through the prop onto the headset = mike? =20 I imagine that you are thinking I've really gone over the edge now. =20 I had a similar problem with my Lightspeed headset that was caused by sunlight passing through the prop early in the morning when facing east. = It took a long time to figure out that placing my hand over the mike to = shield it from the light would stop the noise. It took a longer time to get up = the courage to call Lightspeed and ask them about this. They simply said = "send the headset in and we'll fix it." I did that and haven't had the = problem since. =20 Steve Boese =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes Sent: Tuesday, October 06, 2009 4:54 PM To: Rotary motors in aircraft Subject: [FlyRotary] Mystery Radio Noise =20 Got the plane back together late Sunday just in time for a few laps = around the airport. Oil temps showed major improvements with the larger inlets. Climbing at 100 mph to 3000 ft, 7200 rpm on take off, reduced to 6500 = rpm at 500 ft agl. Maintained 6500 rpm at 37" MP for several circuits. Oil temps went to = 220F but started to come down when I leveled off. Water stay at 190F or = below. OAT was 88F . My new "test" ducts do not seal as well as the first set = so hopefully I still have room for improvement.=20 =20 While level at 3000 ft \ ground speed showing 145 knots I pitched the = nose down and heard a startling noise in my headset. Almost like wires = shorting. Leveled off and noise stopped. Pitched up no change. Pitch down the = noise returned. I decided it could not be wiring and repeated this several = times. It also happened at slower speeds but I don't remember at what speed it stopped. It doesn't happen on the ground at full power run up. My guess = is my new exhaust is somehow affecting the comm antenna when in a nose down attitude. The exhaust ends about 1 ft in front and 1 ft to the side of = the antenna. Any ideas? =20 Bobby J Hughes RV-10 SC Renesis =20 ------=_NextPart_000_006F_01CA46A0.42DA39B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bobby,

Is it possible that you were on a = westerly heading and only when you pitched down, direct sunlight was passing = through the prop onto the headset mike?

I imagine that you are thinking = I’ve really gone over the edge now.

I had a similar problem with my = Lightspeed headset that was caused by sunlight passing through the prop early in = the morning when facing east. It took a long time to figure out that = placing my hand over the mike to shield it from the light would stop the = noise. It took a longer time to get up the courage to call Lightspeed and ask = them about this. They simply said “send the headset in and = we’ll fix it.” I did that and haven’t had the problem = since.

Steve Boese

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Tuesday, October = 06, 2009 4:54 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Mystery Radio Noise

Got the plane back together = late Sunday just in time for a few laps around the airport. Oil temps showed major improvements with the larger inlets. Climbing at 100 = mph to 3000 ft, 7200 rpm on take off, reduced to 6500 rpm at 500 ft = agl.

Maintained 6500 rpm at = 37" MP for several circuits. Oil temps went to 220F but started to come down = when I leveled off. Water stay at 190F or below. OAT was 88F . My new "test" ducts do not seal as well as the first = set so hopefully I still have room for improvement.

While level at 3000 ft \ = ground speed showing 145 knots I pitched the nose down and heard a startling noise in my headset. Almost like wires shorting. = Leveled off and noise stopped. Pitched up no change. Pitch down the noise returned. = I decided it could not be wiring and repeated this several times. It also happened = at slower speeds but I don't remember at what speed it stopped. It doesn't = happen on the ground at full power run up. My guess is my new exhaust is = somehow affecting the comm antenna when in a nose down attitude. The exhaust = ends about 1 ft in front and 1 ft to the side of the antenna. Any = ideas?

Bobby J = Hughes

RV-10 SC = Renesis

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