X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ye0-f182.google.com ([209.85.213.182] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTPS id 6437041 for flyrotary@lancaironline.net; Thu, 22 Aug 2013 06:48:49 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.213.182; envelope-from=rwstracy@gmail.com Received: by mail-ye0-f182.google.com with SMTP id q14so304115yen.13 for ; Thu, 22 Aug 2013 03:48:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:references:from:content-type:in-reply-to:message-id:date:to :content-transfer-encoding:mime-version; bh=VWzPVSWT5vUb5rqNfEzDcMfe3szD8RWF6j9yYSq9zt8=; b=uyTab7hJoRCGeLuGXa45M8t1HQqU5pXi2ouqAcwuw+JhQWn1BhUROGGIpM8u4AlHwe +mUhtEGXC5jbMTzsR36pBQYjaaaFUHXQejDQHu9BjF9fM5bYa4HBdmptE6q5JPu8oIcT XBejGwEZZjJwDv55AMB0/xlwjEw8FpX91zl8Bnz9iNRGhLKZNkhvjrAC6Pq7XC4E4SjI feDV/iH3it/D24RyMojG1vIj4C22G25QF/0bvq87ePJF6xuqjZ3o6zc1kvDd7JTtCrbI AhboTHbJOU23STEHj7hSPiWX+RHUixZilde6qjyXoT4I/dRNM5wer8I0dDvsruDsFLVM EIHw== X-Received: by 10.236.220.71 with SMTP id n67mr10054784yhp.39.1377168494452; Thu, 22 Aug 2013 03:48:14 -0700 (PDT) Return-Path: Received: from [192.168.1.3] (206.sub-70-209-8.myvzw.com. [70.209.8.206]) by mx.google.com with ESMTPSA id u52sm13298216yhg.5.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 22 Aug 2013 03:48:13 -0700 (PDT) Subject: Re: [FlyRotary] Fuel map scrambled. References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-BFE744F5-9B0E-4B75-88D4-A45B7C62F036 X-Mailer: iPad Mail (10B329) In-Reply-To: Message-Id: <19DD8C99-3BE6-46DB-969B-6C565144B88D@gmail.com> Date: Thu, 22 Aug 2013 06:48:11 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-BFE744F5-9B0E-4B75-88D4-A45B7C62F036 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable I've written about this so many times I've lost count. The scrambled map t= able problem is ALWAYS caused by electrical noise spikes. The root cause of= those is poor electrical system layout including ground distribution. You c= an sometimes fix the problem by addressing the individual sources (coil powe= r inputs, starter solenoid, etc) but its also important to have a proper arc= hitecture to begin with. =20 I have a two page guideline for this in the installation guide for last seve= ral years but it's too many bytes to post here. Email me a request and I'll= send it direct if you want a copy and its not in your installation guide a= lready. Tracy Crook Sent from my iPad On Aug 21, 2013, at 22:09, hoursaway1@comcast.net wrote: > 1st..... am now on the ground safe & sound, no damage normal landing. T= he story goes....... Level at 2500' above Mason Jewett Field, ( hazy eveni= ng, aprox. 7:30 pm ) on the down wind abeam of the end of the runway, 46= 00 rpm, ? MAP, 125 MPH ind., 3rd circle around the patch getting ready t= o put in full cruise pitch on prop to do a full throttle numbers gathering. = Then the eng. started running very poorly, missing, stumbling hard, destic= t loss of power, tryed to descend & come around to land but am high & hot w= ith ( RV's need air brakes ) eng. smoothed out, chose a sweet spot & clim= bed out to go around,,, low but climbing, ran smooth 4000 rpm, landed ok.= Before shutdown, checked fuel map bars for EC2 on EM2, some in the midd= le some at the bottom,,,Lean,,, why did the fuel map scramble suddenly, ste= ady cruise flight, made no changes at that time? At the airport by 6:30, p= ull plane from hanger to do two tests tonight, 1st. run eng. at low power/id= le like sitting in line for takeoff from Osh or ?, how long can we stay run= ning without getting to hot, 18 min. coolant 205 F, oil 175 F, ok that's g= ood enough for me lets go fly & do the prop full cruise pitch test run. Tha= t was the start of the evening, ended differently than I would have liked. B= ut nothing bent. Did not reset EC2 yet, am going to start eng. & check to= see if computer B runs ok, did not get a chance to throw that switch, when I= found the sweet spot I changed nothing, just came around & landed. What is= the fix for this anomaly?? David R Cook RV6A Rotary --Apple-Mail-BFE744F5-9B0E-4B75-88D4-A45B7C62F036 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
I've written about this so many times I= 've lost count.   The scrambled map table problem is ALWAYS caused by e= lectrical noise spikes.  The root cause of those is poor electrical sys= tem layout including ground distribution.  You can sometimes fix the pr= oblem by addressing the individual sources (coil power inputs, starter solen= oid, etc) but its also important to have a proper architecture to begin with= .  

I have a two page guideline for this in th= e installation guide for last several years but it's too many bytes to post h= ere.  Email me a request and I'll send it direct if you want a copy and= its not in your  installation guide already.

= Tracy Crook

Sent from my iPad

On Aug 21, 2013, a= t 22:09, hoursaway1@comcast.net wrote:

1st..... am now on the ground sa= fe & sound, no damage normal landing.    The story goes.......= Level at 2500' above Mason Jewett Field,  (  hazy evening, aprox.= 7:30 pm  )  on the down wind abeam of the end of the runway, &nbs= p; 4600 rpm,  ? MAP,  125 MPH  ind.,  3rd circle around t= he patch getting ready to put in full cruise pitch on prop to do a full thro= ttle numbers gathering.  Then the eng. started running very poorly,&nbs= p; missing, stumbling hard, destict loss of power,  tryed to descend &a= mp; come around  to land but am high & hot with  (  RV's n= eed air brakes )  eng. smoothed out, chose a sweet spot & climbed o= ut to go around,,, low  but climbing,  ran smooth 4000 rpm,  l= anded ok.  Before shutdown,  checked fuel map bars for EC2  o= n EM2,  some in the middle some at the bottom,,,Lean,,, why did the fue= l map scramble suddenly,  steady cruise flight, made no changes at that= time?  At the airport by 6:30,  pull plane from hanger to do two t= ests tonight, 1st. run eng. at low power/idle like sitting in line for takeo= ff from Osh or ?,  how long can we stay running without getting to hot,= 18 min. coolant 205 F,  oil 175 F,  ok that's good enough for me l= ets go fly & do the prop full cruise pitch test run.  That was the s= tart of the evening, ended differently than I would have liked.  But no= thing bent.   Did not reset EC2  yet, am going to start eng. &= check to see if computer B runs ok, did not get a chance to throw that swit= ch, when I found the sweet spot I changed nothing, just came around & la= nded.  What is the fix for this anomaly??      = ;            &nb= sp; David R Cook  RV6A  Rotary
= = --Apple-Mail-BFE744F5-9B0E-4B75-88D4-A45B7C62F036--