X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3741329 for flyrotary@lancaironline.net; Wed, 01 Jul 2009 09:15:31 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta01.mail.rr.com with ESMTP id <20090701131452892.ZCEX15319@cdptpa-omta01.mail.rr.com> for ; Wed, 1 Jul 2009 13:14:52 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] frustrating couple of days Date: Wed, 1 Jul 2009 09:15:01 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01C9FA2C.6A27FB80" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-Reply-To: Thread-Index: Acn6AdkKEcbsBqIkRCWeolFrV4IQaAASmI/w X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20090701131452892.ZCEX15319@cdptpa-omta01.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_002A_01C9FA2C.6A27FB80 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Mike, its got to be frustrating to have it run well for a couple of months and just when you have convinced yourself the problem is gone, it comes back. I presume there is nothing (no action, sequence of actions) that you can think of having taken recently - any different than you have done during the months the engine ran well that you can think of. Nothing different perhaps in getting ready for another flight? Since the fuel map is stored in non-volute memory, it's hard to figure out how it is being re-written or destroyed. Normally (as you know) access to EEPROM on a chip is a rather non-trivial process. Since the A and B controller are two different chips, I suppose there could be a problem with the B chip - but, while that does happen, it's pretty rare. Have not had one myself (yet). You are able to copy over the A MAP to the B MAP and it apparently does the copy, but then something causes it to be re-written with garbage. You do not have Auto tune and I presume you do not attempt to change the B MAP - but it changes on its own. It sounds as it the changes to B happen whether you have selected B controller or not - is that correct. Or does it only happen when you are using the B controller or can you tell. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mike Wills Sent: Wednesday, July 01, 2009 12:10 AM To: Rotary motors in aircraft Subject: [FlyRotary] frustrating couple of days I havent flown my RV since a couple of cases of lost data in the EC2 back in february. Spent the last few months making a bunch of mods, some suggested by Tracy, others were things that I thought might increase long term reliability. Also had to fix leaking fuel tanks in the ensuing period. Been working up toward renewing flight testing. Engine has been running really well for the last few months. Thought that the problem was cured, though not clear how. Then on saturday found that once again my B controller had lost all data. Engine wouldnt run at any throttle setting on B. Restored the B controller by copying A > B. Last night after work ground ran the engine for about 30 minutes at various throttle settings and it ran as good as always. Also ran fine on the B controller. Tonight after work I fired it up. Ran fine initially. After about 15 minutes noted some minor surging at a couple of throttle settings below 2000 RPM. Also noticed that in this RPM range where the mixture had previously been fine, my mixture monitor is off the scale lean. Slowly got worse, to the point that it wouldnt idle at what was previously a solid 1350RPM. Couldnt get it to run at all below 1500, everything between 1500 and about 3000 RPM pretty rough. Everything over 3000 is fine. No idea what caused this change. I put the airplane away and walked away in disgust. I'm back to where I was a year ago and I'm just about fed up with this thing. Mike Wills RV-4 N144MW __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_002A_01C9FA2C.6A27FB80 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Mike, its got to be frustrating to = have it run well for a couple of months and just when you have convinced  = yourself the problem is gone, it comes back.

 

I presume there is nothing (no = action, sequence of actions) that you can think of having taken recently - any different than you have done during the months the engine ran well that = you can think of.  Nothing different perhaps in getting ready for another = flight?

 

Since the fuel map is stored in = non-volute memory, it’s hard to figure out how it is being re-written or destroyed.  Normally (as you know) access to EEPROM on a chip is a = rather non-trivial process.   Since the A and B controller are two = different chips, I suppose there could be a problem with the B chip – but, = while that does happen, it’s pretty rare.  Have not had one myself = (yet).

 

You are able to copy over the A MAP = to the B MAP and it apparently does the copy, but then something causes it to = be re-written with garbage.  You do not have Auto tune and I presume = you do not attempt to change the B MAP – but it changes on its own.  = It sounds as it the changes to B happen whether you have selected B = controller or not – is that correct.  Or does it only happen when you are = using the B controller or can you tell.

 

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mike Wills
Sent: Wednesday, July 01, = 2009 12:10 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] = frustrating couple of days

 

I havent flown my RV since a couple of cases of lost = data in the EC2 back in february. Spent the last few months making a bunch of = mods, some suggested by Tracy, others were things that I thought might increase long term reliability. = Also had to fix leaking fuel tanks in the ensuing = period.

 

Been working up toward renewing flight testing. = Engine has been running really well for the last few months. Thought that the = problem was cured, though not clear how. Then on saturday found that once again = my B controller had lost all data. Engine wouldnt run at any throttle setting = on B. Restored the B controller by copying A > = B.

 

Last night after work ground ran the engine for about = 30 minutes at various throttle settings and it ran as good as always. Also = ran fine on the B controller.

 

Tonight after work I fired it up. Ran fine initially. = After about 15 minutes noted some minor surging at a couple of throttle = settings below 2000 RPM. Also noticed that in this RPM range where the mixture = had previously been fine, my mixture monitor is off the scale = lean. Slowly got worse, to the point that it wouldnt idle at what was previously a solid 1350RPM. Couldnt get it to run at all below 1500, everything between = 1500 and about 3000 RPM pretty rough. Everything over 3000 is fine. No idea what = caused this change. I put the airplane away and walked away in disgust. I'm = back to where I was a year ago and I'm just about fed up with this = thing.

 

Mike Wills

RV-4 N144MW



__________ Information from ESET NOD32 Antivirus, version of virus = signature database 3267 (20080714) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

------=_NextPart_000_002A_01C9FA2C.6A27FB80--