X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.4.6) with ESMTP id 5644123 for flyrotary@lancaironline.net; Mon, 09 Jul 2012 12:43:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=2.0 cv=S+JbMfQP c=1 sm=0 a=g3L/TDsr+eNLfIieSKfGkw==:17 a=AHkS0RJitIMA:10 a=MOx_xhIay4AA:10 a=05ChyHeVI94A:10 a=ayC55rCoAAAA:8 a=LoHkbMfiAAAA:8 a=oCcaPWc0AAAA:8 a=aDXiq1Zcc9fChErl6zAA:9 a=wPNLvfGTeEIA:10 a=dgUnYx4bRmMA:10 a=Ia-xEzejAAAA:8 a=F8BlOQaaqcLZp9NZ3JoA:9 a=_W_S_7VecoQA:10 a=wvcWU0hdy_YA:10 a=EzXvWhQp4_cA:10 a=g3L/TDsr+eNLfIieSKfGkw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.170.10 Received: from [174.110.170.10] ([174.110.170.10:56807] helo=EdPC) by cdptpa-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 12/A2-00747-BF90BFF4; Mon, 09 Jul 2012 16:42:35 +0000 Message-ID: From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] First lift off with single rotor Date: Mon, 9 Jul 2012 12:42:39 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0011_01CD5DD0.5311F940" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_0011_01CD5DD0.5311F940 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sohn, was you conclusion that excessive air pressure under the cowl was = causing the engine to lean out?? What type of fuel induction system do = you have mounted? Sounds like you are a couple of taxi test away from first flight. Ed From: Richard Sohn=20 Sent: Monday, July 09, 2012 11:49 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] First lift off with single rotor Cleared the ground for a brief period today. As far as the airplane is = concerned, everything is good. CG seems to be right on the spot. Much = better as it was 12 years ago at the first flight with the SOOB.=20 Here is the reason why it was not a flight. A few days ago when I = started high speed taxi, as soon as it picked up air speed, the engine = started to sputter and almost cut out totally. This was at the same RPM = as at a run up, where it does not do that. With a wiggly tail dragger as = the Avid is, there was no way reading enough instrument for making a = preliminary analysis. I recorded the instrument panel with a GoPro at = 2sec intervals. Looking at the first pictures, the answer came up right away, increasing = pressure under the cowl where the intake for the engine is located. Like = the EGT shot up over 1600 just before the sputtering started. Since my = radiator air is going to the outside of the cowling, there was no impact = on cooling. Btw cooling is really good. At an OAT of 95F, oil and water = stayed at around 170F no matter what I did.=20 For todays runs, I taped the inlet around the prop hub shut. Sure = enough, the sputtering occurred at higher airspeed, and was not as = total, however, EGT was still going to around 1600.=20 The conclusion is, I have to open the cowling exits a lot. Richard Sohn N2071U http://www.fairpoint.net/~res12/home.html No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2195 / Virus Database: 2437/5121 - Release Date: = 07/09/12 ------=_NextPart_000_0011_01CD5DD0.5311F940 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Sohn, was you conclusion that excessive air = pressure under=20 the cowl was causing the engine to lean out??  What type of fuel = induction=20 system do you have mounted?
 
Sounds like you are a couple of taxi test away = from first=20 flight.
 
Ed

Sent: Monday, July 09, 2012 11:49 AM
Subject: [FlyRotary] First lift off with single=20 rotor

Cleared the ground for a brief period today. As far as the airplane = is=20 concerned, everything is good. CG seems to be right on the spot. Much = better as=20 it was 12 years ago at the first flight with the SOOB.
Here is the reason why it was not a flight. A few days ago when I = started=20 high speed taxi, as soon as it picked up air speed, the engine started = to=20 sputter and almost cut out totally. This was at the same RPM as at a run = up,=20 where it does not do that. With a wiggly tail dragger as the Avid is, = there was=20 no way reading enough instrument for making a preliminary analysis. I = recorded=20 the instrument panel with a GoPro at 2sec intervals.
Looking at the first pictures, the answer came up right away, = increasing=20 pressure under the cowl where the intake for the engine is located. Like = the EGT=20 shot up over 1600 just before the sputtering started. Since my radiator = air is=20 going to the outside of the cowling, there was no impact on cooling. Btw = cooling=20 is really good. At an OAT of 95F, oil and water stayed at around 170F no = matter=20 what I did.
 
For todays runs, I taped the inlet around the prop hub shut. Sure = enough,=20 the sputtering occurred at higher airspeed, and was not as total, = however, EGT=20 was still going to around 1600.
 
The conclusion is, I have to open the cowling exits a lot.
 
Richard=20 Sohn
N2071U

http://www.fairpoint.net/~res12/home.html

No virus found in this=20 message.
Checked by AVG - www.avg.com
Version: 2012.0.2195 / = Virus=20 Database: 2437/5121 - Release Date: 07/09/12

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