X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [137.118.16.59] (HELO smtp1.av-mx.com) by logan.com (CommuniGate Pro SMTP 5.4.6) with ESMTP id 5644010 for flyrotary@lancaironline.net; Mon, 09 Jul 2012 11:50:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.59; envelope-from=res12@fairpoint.net Received: from MAIN (unknown [66.243.228.156]) (Authenticated sender: res12@fairpoint.net) by smtp1.av-mx.com (Postfix) with ESMTP id 172A7104059 for ; Mon, 9 Jul 2012 11:49:37 -0400 (EDT) Message-ID: <24166703C38C4233A8CB998F3989F93F@MAIN> From: "Richard Sohn" To: Subject: First lift off with single rotor Date: Mon, 9 Jul 2012 10:49:27 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0043_01CD5DC0.82DF2AE0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3555.308 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 This is a multi-part message in MIME format. ------=_NextPart_000_0043_01CD5DC0.82DF2AE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------=_NextPart_000_0043_01CD5DC0.82DF2AE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

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

------=_NextPart_000_0043_01CD5DC0.82DF2AE0--