Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 336136 for flyrotary@lancaironline.net; Tue, 27 Jul 2004 14:58:06 -0400 Received-SPF: error receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i6RIvXNs019779 for ; Tue, 27 Jul 2004 14:57:34 -0400 (EDT) Message-ID: <002001c4740b$980a7160$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EM-2 Accuracy of RPM Date: Tue, 27 Jul 2004 14:57:41 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01C473EA.10C90ED0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C473EA.10C90ED0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I would be very surprised if the EC2 is not within +- a couple of RPM. = I have just completed the RPM function in my digital fuel monitoring = system and it will read to within +-1 RPM of the actually rpm. There is = no question that the readout from the EC2 would be many times more = accurate than any eyeball tach gauge (or even a great ear {:>)) That's not to say there is no possibly of error - while digital is quite = capable of that kind of accuracy - in reality it is no better than the = computer computational algorithms that the programmer installed {:>) = (and coded). . Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Tuesday, July 27, 2004 2:15 PM Subject: [FlyRotary] Re: EM-2 Accuracy of RPM That's my thought too, but it does feel like it could be a little high = (using my highly-trained tuned-ear) for the readout. What sounds like a = nice rump, rump, rump, is usually indicating between 1200-1500 rpm. Its = probably just be the unique "rotary sound" vs. the typical American V-8 = sound. Also, the 3-rotor has a different sound than the 2-rotor. I'll = guess I need to address this to Tracy. Isn't Tracy at OSH this week? =20 Mark S. At 12:51 PM 7/27/2004 -0500, you wrote: Has anyone actually verified the rpm readings from the EM-2? I have no particular reason to question it, but it would be = good to know that the EM-2 readings are accurate within some factor. Mark S. Hi Mark, I'm assuming that you also have an EC-2. If that's the case, I'm = pretty sure the EM-2 is getting it's RPM data from the EC-2. If the = EC-2 doesn't know the exact RPM of the engine, we're all in trouble :-) = =20 Seriously, I never questioned it for a second, but you can call = Tracy and see if there's any way it could be wrong. =20 Cheers, Rusty ------=_NextPart_000_001D_01C473EA.10C90ED0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I would be very surprised if the EC2 is = not within=20 +- a couple of RPM.  I have just completed the RPM function in my = digital=20 fuel monitoring system and it will read to within +-1 RPM of the = actually=20 rpm.  There is no question that the readout from the EC2 would be = many=20 times more accurate than any eyeball tach gauge (or even a great ear=20 {:>))
 
That's not to say there is no possibly = of error -=20 while digital is quite capable of that kind of accuracy  - in = reality it is=20 no better than the computer computational algorithms that the programmer = installed {:>) (and coded).  .
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Mark=20 Steitle
Sent: Tuesday, July 27, 2004 = 2:15=20 PM
Subject: [FlyRotary] Re: EM-2 = Accuracy of=20 RPM

That's my thought too, but it does feel = like it=20 could be a little high (using my highly-trained tuned-ear) for the=20 readout.  What sounds like a nice rump, rump, rump, is usually = indicating=20 between 1200-1500 rpm.  Its probably just be the unique "rotary = sound"=20 vs. the typical American V-8 sound.  Also, the 3-rotor has a = different=20 sound than the 2-rotor.  I'll guess I need to address this to=20 Tracy.  Isn't Tracy at OSH this week?  

Mark=20 S.


At 12:51 PM 7/27/2004 -0500, you wrote:
Has = anyone actually=20 verified the rpm readings from the
EM-2?  I have no = particular=20 reason to question it, but it would be good to
know that the EM-2 = readings are accurate within some factor.

Mark = S.

Hi=20 Mark,

I'm assuming that you also have an EC-2.  If that's = the case,=20 I'm pretty sure the EM-2 is getting it's RPM data from the = EC-2.  If=20 the EC-2 doesn't know the exact RPM of the engine, we're all in = trouble=20 :-)  

Seriously, I never questioned it for a = second, but you=20 can call Tracy and see if there's any way it could be wrong. =20
Cheers,
Rusty
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