Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3207695 for flyrotary@lancaironline.net; Wed, 05 May 2004 16:13:05 -0400 Received: from rad ([65.0.146.202]) by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040505201305.TPWT1249.imf22aec.mail.bellsouth.net@rad> for ; Wed, 5 May 2004 16:13:05 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] surging Date: Wed, 5 May 2004 15:11:05 -0500 Message-ID: <01d301c432dd$18b4a670$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01D4_01C432B3.2FDE9E70" 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 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_01D4_01C432B3.2FDE9E70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Each cycle of the surging takes a little over 1 sec. RPM surges buy = 300-400 RPM. Manifold pressure fluctuates by 2-3 inches, and the mixture = monitor fluctuates the full range of its scale. Hi Dave, =20 I recall having some problems with this in my early running of rev-1, = and it was just a tuning issue. You have to reduce the mode-2 setting to = minimum, as Tracy suggested, and work your way down very slowly. Once the = surging starts, and the MAP is wandering around, pushing the set button is a = shot in the dark, since the mixture will be changed for the MAP at that instant. = I had to work with mine a bunch to finally get it working well. =20 =20 My suggestion would be to start at the lowest throttle setting that will = run smoothly, then reduce the MAP .5". If this is surges, adjust the = mixture, and throttle as necessary to make it smooth, at exactly the MAP you = wanted. Save this mixture, then reduce the MAP another .5", and repeat until you = hit the idle limit. That's about how I finally got mine to work before, but = I admit to not taking the time to get it right on the current version. =20 =20 Also note that turning down the fuel pressure is basically the same = thing as what John Slade suggested, which was to reduce the overall injector = setting. As long as you haven't run out of travel in your mixture control knob, neither of these steps should be needed though. =20 =20 Good luck. I know it isn't as simple as it sounds to get it right. =20 =20 For the record, my #1 feature request for the EC-2 would be the ability = to save/restore the calibrations to/from an external source (PDA, laptop, = etc). I'm hesitant to fiddle with calibrations for a test, when I already have things running well, because I don't want to have to take the time to = get the calibrations back in line when I'm done. =20 =20 While we're at it, my #1 feature request for the EM-2 is data logging to = the iPAQ. =20 Cheers, Rusty =20 ------=_NextPart_000_01D4_01C432B3.2FDE9E70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Each cycle of the surging takes a little over 1 = sec.  RPM=20 surges buy 300-400 RPM.  Manifold pressure fluctuates by 2-3 = inches, and=20 the mixture monitor fluctuates the full range of its scale.

Hi=20 Dave,
 
I recall = having some=20 problems with this in my early running of rev-1, and it was just a = tuning=20 issue.  You have to reduce the mode-2 setting to minimum, as Tracy=20 suggested, and work your way down very slowly.  Once the surging = starts,=20 and the MAP is wandering around, pushing the set button is a shot in the = dark,=20 since the mixture will be changed for the MAP at that instant.  I = had to=20 work with mine a bunch to finally get it working well.  =20
 
My = suggestion would be=20 to start at the lowest throttle setting that will run smoothly, then = reduce the=20 MAP .5".  If this is surges, adjust the mixture, and throttle as = necessary=20 to make it smooth, at exactly the MAP you wanted.  Save = this=20 mixture, then reduce the MAP another .5", and repeat until you hit = the idle=20 limit.  That's about how I finally got mine to work = before, but I=20 admit to not taking the time to get it right on the current=20 version.  
 
Also note that turning down the = fuel=20 pressure is basically the same thing as what John Slade suggested, which = was to=20 reduce the overall injector setting.  As long as = you haven't=20 run out of travel in your mixture control knob, neither of these steps = should be=20 needed though. 
 
Good luck.  I know it isn't = as simple=20 as it sounds to get it right. 
 
For the record, my #1 = feature request=20 for the EC-2 would be the ability to save/restore the calibrations = to/from an=20 external source (PDA, laptop, etc).   I'm hesitant to = fiddle with=20 calibrations for a test, when I already have things running well, = because I=20 don't want to have to take the time to get the calibrations back in = line=20 when I'm done.   
 
While = we're at it, my #1=20 feature request for the EM-2 is data logging to the = iPAQ.
 
Cheers,
Rusty
 



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