X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.25.9.100] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTP id 1830635 for flyrotary@lancaironline.net; Sun, 11 Feb 2007 14:22:10 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-01.southeast.rr.com (8.13.6/8.13.6) with SMTP id l1BJL9JM025973 for ; Sun, 11 Feb 2007 14:21:10 -0500 (EST) Message-ID: <001301c74e11$85e311d0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Totalizer Date: Sun, 11 Feb 2007 14:19:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01C74DE7.9CA8F0D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0010_01C74DE7.9CA8F0D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI'm not out of retirement yet! These things may just be a money = hole {:>). =20 The simple one uses the pulse duty cycle technique - it doesn't know (or = care about staging). So the fuel flow at idle (before staging) will be = double (assuming your are using 2 injectors before staging and 4 after = staging) that when all injectors are staged. However, at idle, there = is not a whole lot of interest in fuel flow and while it will be double = the actual, it will change to reflect changes in A/F. You could divided = it by 2 - provided you remembered to bring your calculator. {:>) The simply one does not have a fuel totalizer - just not possible with = this approach. Well, I guess you could put in a circuit to integrate = the instantaneous flow rate over some time period - but then the simple = one starts not to be so simple anymore {:>) On the more advanced Monitor , I was working on a circuit to detect = when there were no pulses on the secondary injectors indicating that = staging had not yet occurred and to divide the fuel flow rate in half.=20 However, the EC2 puts out a staging flag for the EM2 that I can more = easily use to do the same thing. Either one would work on a Subaru set up as long as it uses electronic = fuel injection. Ed =20 ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, February 11, 2007 11:53 AM Subject: [FlyRotary] Re: Fuel Totalizer Simple/Inexpensive One is a simply Fuel Flow and Air/Fuel ratio (LED) indicator in a = package small enough to fit in the 2 1/4" instrument hole. But, that is = all the information it will provide - Fuel Flow and Air/Fuel Ratio. = This will be the cheaper version. This will have a 10 segment LED = bargraph for the Air/Fuel Ratio and a 3.5 digit LCD readout for the Fuel = Flow. =20 Hi Ed, Good to see you're giving up retirement. This will give you something = more productive to do that cleaning up goose crap at the airport :-)=20 I would imagine you will be able to sell quite a few of these simple = versions to the Subaru folks that are using fuel injection. With that = in mind, I'd suggest allowing for single injector (rather than staged = injector) operation. At least I don't think the Subaru guys run staged = injectors. =20 Speaking of Subaru's, I have to admit that they sure run well in the = gyro world. The Subaru is running on nearly all the two place gyros, = and they just don't seem to be having any problems, even though they run = high power virtually all the time. The gyro I'm training in has 1400 = hours on it's engine! I'm not about to convert, but I can't help but be = impressed. =20 Cheers, Rusty ------=_NextPart_000_0010_01C74DE7.9CA8F0D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I'm not out of retirement yet!  These = things may just=20 be a money hole {:>). 
 
The simple one uses the pulse duty cycle = technique - it=20 doesn't know (or care about staging).  So the fuel flow at idle = (before=20 staging) will be double (assuming your are using 2 injectors before = staging and=20 4 after staging) that when all injectors are staged.   = However, at=20 idle, there is not a whole lot of interest in fuel flow  and = while=20 it will be double the actual, it will change to reflect changes in=20 A/F.  You could divided it by 2 - provided you remembered to = bring=20 your calculator. {:>)
 
The simply one does not have a fuel totalizer - = just not=20 possible with this approach.  Well, I guess you could put in a = circuit to=20 integrate the instantaneous  flow rate over some time period - = but=20 then the simple one starts not to be so simple anymore = {:>)
 
 
On  the more advanced Monitor , I was = working on a=20 circuit to detect when there were no pulses on the secondary injectors=20 indicating that staging had not yet occurred and to divide the fuel flow = rate in=20 half.
 
However, the EC2 puts out a staging flag for the = EM2 that=20 I can more easily use to do the same thing.
 
Either one would work on a Subaru set up as long = as it=20 uses electronic fuel injection.
 
Ed
  
 
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Sunday, February 11, 2007 = 11:53=20 AM
Subject: [FlyRotary] Re: Fuel=20 Totalizer

Simple/Inexpensive
 
One is a simply Fuel Flow and Air/Fuel ratio = (LED)=20 indicator in a package small enough to fit in the 2 1/4" instrument=20 hole.  But, that is all the information it will provide - = Fuel Flow=20 and Air/Fuel Ratio.  This will be the cheaper version.  This = will=20 have a 10 segment LED bargraph for the Air/Fuel Ratio and a 3.5 digit = LCD=20 readout for the Fuel Flow.   
 
Hi=20 Ed,
 
Good=20 to see you're giving up retirement.  This will give you something = more=20 productive to do that cleaning up goose crap at the airport=20 :-) 
 
I=20 would imagine you will be able to sell quite a few of these = simple=20 versions to the Subaru folks that are using fuel injection.  With = that in=20 mind, I'd suggest allowing for single injector (rather than staged = injector)=20 operation.  At least I don't think the Subaru guys run = staged=20 injectors.  
 
Speaking of Subaru's, I have to admit that they = sure run=20 well in the gyro world.  The Subaru is running on nearly all = the two place gyros, and they just don't seem to be having any = problems,=20 even though they run high power virtually all the time.  The=20 gyro I'm training in has 1400 hours on it's = engine!  I'm not=20 about to convert, but I can't help but be=20 impressed.  
 
Cheers,
Rusty
    
------=_NextPart_000_0010_01C74DE7.9CA8F0D0--