Return-Path: Received: from fed1mtao07.cox.net ([68.6.19.124] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3136642 for flyrotary@lancaironline.net; Tue, 30 Mar 2004 10:51:38 -0500 Received: from Leonards ([68.111.228.182]) by fed1mtao07.cox.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040330155137.CEPK2451.fed1mtao07.cox.net@Leonards> for ; Tue, 30 Mar 2004 10:51:37 -0500 From: "David Leonard" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] No rev-2 flying yet (Tracy, see comments in red) Date: Tue, 30 Mar 2004 07:51:38 -0800 Message-ID: <000401c4166e$e30cd860$b6e46f44@Leonards> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C4162B.D4E99860" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.3416 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C4162B.D4E99860 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Rusty, that is exactly what I am experiencing. Always runs great above 2000, can sometimes get it to behave down to 900 RPM and a MAP of about 11, especially if I go slowly. But usually it gets stuck in that too-rich-to-run-well-but-can't-tolerate-sudden-leaning-without-stopping realm. David Leonard The Rotary Roster: http://members.aol.com/_ht_a/rotaryroster/index.html The other issue is when you chop the throttle from a high setting, to idle. This is very strange. Say the idle is set at 1900 rpm, and I'm running at high throttle. When I chop the throttle, the rpm goes low, to around 1600 and stays there. During this time, the MP is 16.0, and the engine is very rough. It will stay here forever, but if you turn the mixture knob about 90 degrees CCW to lean it out, it smoothes out, the rpm increases to 1900, and the MP drops to 13.0. If you are at a higher throttle setting, and decrease throttle more slowly, it will come down to 1900 rpm, 13 MP, and smooth. It also seems like the engine is jumping back and forth between the dual map ranges, and I believe this false 16" MP reading at the rough, low idle is from the dual map. I think I even proved that to myself by watching the EM-2 screen that shows EC-2 readings. I've got some work to do on this one, but it's just a tuning issue. ------=_NextPart_000_0005_01C4162B.D4E99860 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Rusty, that is exactly what I am experiencing.  Always runs great above 2000, can sometimes get it = to behave down to 900 RPM and a MAP of about 11, especially if I go slowly.   But usually it gets stuck in that = too-rich-to-run-well-but-can’t-tolerate-sudden-leaning-without-stop= ping realm.

 

David Leonard

The Rotary = Roster:

http://memb= ers.aol.com/_ht_a/rotaryroster/index.html

 

The other issue is when you chop = the throttle from a high setting, to idle.  This is very strange.  = Say the idle is set at 1900 rpm, and I’m running at high = throttle.  When I chop the throttle, the rpm goes low, to around 1600 and stays there.  During this time, the MP is 16.0, and the engine is very = rough.  It will stay here forever, but if you turn the mixture knob about 90 = degrees CCW to lean it out, it smoothes out, the rpm increases to 1900, and the = MP drops to 13.0.  If you are at a higher throttle setting, and = decrease throttle more slowly, it will come down to 1900 rpm, 13 MP, and = smooth.  It also seems like the engine is jumping back and forth between the dual = map ranges, and I believe this false 16" MP reading at the rough, low = idle is from the dual map.  I think I even proved that to myself by = watching the EM-2 screen that shows EC-2 readings.   I’ve got = some work to do on this one, but it's just a tuning issue.  =

 

 

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