Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 721936 for flyrotary@lancaironline.net; Wed, 09 Feb 2005 11:56:15 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050209165444.IZWH2148.imf25aec.mail.bellsouth.net@rd> for ; Wed, 9 Feb 2005 11:54:44 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Microtech EFI and Tuning, was Re: [FlyRotary] Re: Bad day at the airport Date: Wed, 9 Feb 2005 10:55:07 -0600 Message-ID: <000001c50ec8$1bd50300$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C50E95.D13A9300" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C50E95.D13A9300 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I got up to 5100 rpms static, and most people told me that the prop = would most likely unload in flight. How can I obtain more than 5100 rpm's = unless I fly it? =20 =20 =20 Hi Paul, =20 I asked Tracy that same question when I was first tuning my EC-2. The answer (for his unit) was that it didn't matter. The system bases it's = fuel injection pulse width on MAP, which will be nearly the same in static = runs as it is in normal climb speeds. When your prop unloads in flight, you = run higher rpms, but that doesn't change the pulse width requirement for = each intake cycle at a given MAP. It just means you need more pulses, = because you have more intake cycles. =20 =20 It's VERY important to realize that everything I just said was based on Tracy's EC-2. There's a very real chance that the MicroTech DOES care = what the rpm is. I know that the Power FC computer in my FD had a fuel = injection and timing table that was based on RPM and MAP. This gives you more = power to tune, but as they say, with power comes responsibility :-) =20 FWIW, I really do like the MicroTech unit, and I thought really hard = about getting a couple for the single rotor project, but eventually went with = what I know, which is Tracy's EC-2. Part of that decision was based on = having a backup controller if I ever suspected a problem, though it sure would be nice if someone would include the ability to save and restore tuning parameters (between slathering foam and fiberglass on a clapped out = travel trailer) :-) I also like the built in backup (which would have ruled = out an EFI tuning issue for you), and don't quite know how you'd wire two MicroTech's together. I also like the mixture knob, which is powerful enough to overcome almost any tuning mistake. I also felt it was safer = for me to have only one unit to try to remember. =20 =20 Hang in there Paul. Give this some thorough consideration before doing anything drastic. I seem to recall you giving me some similar advice = not long ago. =20 =20 Cheers, Rusty =20 ------=_NextPart_000_0001_01C50E95.D13A9300 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I got up to 5100 rpms static, and = most people=20 told me that the prop would most likely unload in flight.  How can = I obtain=20 more than 5100 rpm's unless I fly it?   
 
 
Hi Paul,
 
I asked Tracy that same question when I was = first tuning my=20 EC-2.  The answer (for his unit) was that it didn't matter.  = The=20 system bases it's fuel injection pulse width on MAP, which will be = nearly=20 the same in static runs as it is in normal climb = speeds.  =20 When your prop unloads in flight, you run higher rpms, but that doesn't = change=20 the pulse width requirement for each intake cycle at a given MAP.  = It just=20 means you need more pulses, because you have more intake=20 cycles.  
 
It's VERY important to realize that = everything I just=20 said was based on Tracy's EC-2.  There's a very real chance that = the=20 MicroTech DOES care what the rpm is.  I know that the Power FC = computer in my FD had a fuel injection and timing table that was based = on RPM=20 and MAP.  This gives you more power to tune, but as they say, with = power=20 comes responsibility :-)
 
FWIW, I really do like the MicroTech = unit, and I=20 thought really hard about getting a couple for the single rotor project, = but=20 eventually went with what I know, which is Tracy's EC-2.   = Part of=20 that decision was based on having a backup controller if I ever = suspected a=20 problem, though it sure would be nice if someone would include the = ability=20 to save and restore tuning parameters (between slathering foam = and=20 fiberglass on a clapped out travel trailer)  :-)    = I also=20 like the built in backup (which would have ruled out an EFI tuning=20 issue for you), and don't quite know how you'd wire two MicroTech's = together.   I also like the mixture knob, which is powerful = enough to=20 overcome almost any tuning mistake.  I also felt it was safer for = me to=20 have only one unit to try to remember.   =20
 
Hang in there Paul.   Give this=20 some thorough consideration before doing anything drastic.  I = seem to=20 recall you giving me some similar advice not long=20 ago.  
 
Cheers,
Rusty   =
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