Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3136977 for flyrotary@lancaironline.net; Tue, 30 Mar 2004 13:13:46 -0500 Received: from rad ([65.0.151.4]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040330181345.PVJE1763.imf25aec.mail.bellsouth.net@rad> for ; Tue, 30 Mar 2004 13:13:45 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: No rev-2 flying yet (Tracy, see comments in red) Date: Tue, 30 Mar 2004 12:15:49 -0600 Message-ID: <002d01c41683$07dd0a70$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002E_01C41650.BD429A70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_002E_01C41650.BD429A70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable This may occur because in one fraction of a second you are opearting at = WOT (lots of fuel flow) and the next down to idle. =20 =20 =20 In thinking about this some more, it would make sense that I didn't have nearly the same problem before. In the rev-1 version, I had the primary injectors in the block, and the secondaries were only about 14 inches = away. Now, all four injectors are about 30 inches away, so there's a lot more = fuel left in the intake when you chop the throttle. =20 I agree with Tracy that this isn't my normal operating mode, but when testing the engine, I like to try everything I can think of, so there = won't be any unpleasant surprised in flight. FWIW, the turbo used to throw a = nice flame out the short pipe when I'd chop the throttle, but I don't know if that would make it to the end of a longer pipe, through a muffler. =20 =20 Rusty (off to test my O2 reading on the EM-2) =20 ------=_NextPart_000_002E_01C41650.BD429A70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
This may occur because in one = fraction of=20 a second you are  opearting at WOT (lots of fuel flow) =  and the=20 next down to idle.   
 
 
In thinking about=20 this some more, it would make sense that I didn't have nearly the same = problem=20 before.  In the rev-1 version, I had the primary injectors in the = block,=20 and the secondaries were only about 14 inches away.  Now, all four=20 injectors are about 30 inches away, so there's a lot more fuel left in = the=20 intake when you chop the throttle.
 
I = agree with=20 Tracy that this isn't my normal operating mode, but when testing the = engine, I=20 like to try everything I can think of, so there won't be any unpleasant=20 surprised in flight.  FWIW, the turbo used to throw a = nice flame=20 out the short pipe when I'd chop the throttle, but I don't know if = that=20 would make it to the end of a longer pipe, through a=20 muffler.  
 
Rusty (off to=20 test my O2 reading on the=20 EM-2)  
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