Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.93.67.82] verified) by logan.com (CommuniGate Pro SMTP 4.1b9) with ESMTP id 2480204 for flyrotary@lancaironline.net; Sun, 20 Jul 2003 18:38:00 -0400 Received: from o7y6b5 (clt78-221.carolina.rr.com [24.93.78.221]) by ms-smtp-01.southeast.rr.com (8.12.5/8.12.2) with SMTP id h6KMVfpN029586 for ; Sun, 20 Jul 2003 18:31:43 -0400 (EDT) Message-ID: <001401c34f10$a247ee80$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Tachs & things Date: Sun, 20 Jul 2003 18:45:35 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0011_01C34EEF.1AE26220" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0011_01C34EEF.1AE26220 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Todd, I use a regular tach meant for a four cylinder engine and run it off = the yellow wire from the trailing ignition module which is designed to = drive a Tach. I also drove it off the negative lead of the leading coil = for a while. Great to hear that the Ford evaporator cores appear to be doing the = job. Lets see 85C =3D 9/5*C+32 =3D 185F, yep! that looks very good, I = can generally get about a 3 minute runup at max power with the cowl on = before the temps start getting too high. Coolder OAT and taking the = cowl off extends that considerably. Hope the water pump continues to do as good as it initially looks. Congratulation!! Ed Anderson ----- Original Message -----=20 From: Haywire=20 To: Rotary motors in aircraft=20 Sent: Sunday, July 20, 2003 3:09 PM Subject: [FlyRotary] Tachs & things Hey Guys; I took the plane to the airport on Friday, mounted the wings and = went taxi testing yesterday. As simple as this may be for many of you, = it was a bit of a thrill for me. Everything seems to run great. I'm = currently running the EC2 in it's default settings as I was awaiting the = EM2, before beginning tuning, but as most of you are now aware it may = not be available until December. I bought a couple of temp & pressure = gauges and a couple of tachs. Today I'll go see if I can find an EGT & = O2 sensor. For those that are curious, The EWP seems to be working great, but = with one concern that I'll keep a close eye on. I taxied for about 20 = min with one full power run up, and temps never exceeded 85C, so the = cooling system appears to be adequate. Some of you may recall that I = went with the Ford evaporator cores because they fit in much better than = the GM cores. Even though flow tests showed that they had slightly = higher flow rates than the GM cores, some were concerned that they may = not work due to a magazine article from a few years back, where the two = different cores were cut open for a comparison of tube area, that showed = the Ford cores appeared to be more restrictive. I realize that it is = still very preliminary, but so far I like what I see.=20 Now what concerns me.. I wired the EWP with a bypass switch so = that I can run the EWP at full speed, bypassing the temp controller. I = also use this switch to continue circulation after engine shut down. So = yesterday after the engine was shut down, I could hear the EWP pumping = when suddenly it made a few unhealthy sounding noises like it was about = to seize, then it quickly returned to normal and didn't do it again. I = will keep a close eye on this. Now about tachs.. I've tried a couple of approaches. I bought a = Hastings tach, which I've currently connected to the EC2 tach output. = Now this is a 12 pulse/rev signal for a high resolution tach, like the = EIS. So with the tach set for an 8 cylinder 4 stroke, it should read 3X = higher than actual. My test runs show this to be right (I think), but = once the tach wraps, the needle will drop down to approximately 1/2, = giving me a reading that is closer to actual. This leads me to wonder if = I can add a filter of some sort, to get the right signal. Maybe a good = question for 'electric Bob'. Tracy suggested to Rusty that he could get = a trigger signal from a coil trigger. However this should produce 1/2 = the actual signal, when set for a 4 cylinder. So I theorized that a 2 = stroke tach may produce an accurate signal so I grabbed a Bombardier = tach and wired it into a coil trigger, but like Rusty, I found that this = didn't work at all. I'm not certain why, as the coil trigger should give = at least some signal. My new ski-doo has a digital engine management = computer, which provides the tach signal, so I'm thinking that it may be = a high resolution signal, so I think maybe I'll pull it out and take up = to the airport and try it. Is there anybody on this list that is using the EC2 and getting an = accurate signal to drive an inexpensive, off the shelf tach? What about = those, not using the EC2, how are you getting your trigger signal? Any input would be greatly appreciated. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe = in, Enthusiastically act upon, Must inevitably come to pass".=20 ------=_NextPart_000_0011_01C34EEF.1AE26220 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Todd,
    I use a regular tach = meant for a=20 four cylinder engine and run it off the yellow wire from the trailing = ignition=20 module which is designed to drive a Tach.  I also drove it off the = negative=20 lead of the leading coil for a while.
 
    Great to hear that = the Ford=20 evaporator cores appear to be doing the job.  Lets see 85C =3D = 9/5*C+32 =3D=20 185F, yep! that looks very good, I can generally get about a 3 minute = runup at=20 max power with the cowl on before the temps start getting too = high. =20 Coolder OAT and taking the cowl off extends that = considerably.
 
Hope the water pump continues to do as = good as it=20 initially looks.
 
Congratulation!!
 
Ed Anderson
 
 
----- Original Message -----
From:=20 Haywire
Sent: Sunday, July 20, 2003 = 3:09 PM
Subject: [FlyRotary] Tachs = &=20 things

Hey=20 Guys;
    I took the plane to the airport on Friday, mounted the wings = and went=20 taxi testing yesterday. As simple as this may be for many of you, it = was a bit=20 of a thrill for me. Everything seems to run great. I'm currently = running the=20 EC2 in it's default settings as I was awaiting the EM2, before = beginning=20 tuning, but as most of you are now aware it may not be available until = December. I bought a couple of temp & pressure gauges and a couple = of=20 tachs. Today I'll go see if I can find an EGT & O2=20 sensor.
    For those that are curious, The EWP seems to be working = great, but with=20 one concern that I'll keep a close eye on. I taxied for about 20 min = with one=20 full power run up, and temps never exceeded 85C, so the cooling system = appears=20 to be adequate. Some of you may recall that I went with the Ford = evaporator=20 cores because they fit in much better than the GM cores. Even though = flow=20 tests showed that they had slightly higher flow rates than the GM = cores, some=20 were concerned that they may not work due to a magazine = article from=20 a few years back, where the two different cores were cut open for a = comparison=20 of tube area, that showed the Ford cores appeared to be more = restrictive. I=20 realize that it is still very preliminary, but so far I like what I = see.=20
    Now what concerns me.. I wired the EWP with a bypass switch = so that I=20 can run the EWP at full speed, bypassing the temp controller. I also = use this=20 switch to continue circulation after engine shut down. So yesterday = after the=20 engine was shut down, I could hear the EWP pumping when suddenly it = made a few=20 unhealthy sounding noises like it was about to seize, then it quickly = returned=20 to normal and didn't do it again. I will keep a close eye on=20 this.
    Now about tachs.. I've tried a couple of approaches. I bought = a=20 Hastings tach, which I've currently connected to the EC2 tach output. = Now this=20 is a 12 pulse/rev signal for a high resolution tach, like the EIS. So = with the=20 tach set for an 8 cylinder 4 stroke, it should read 3X higher = than=20 actual. My test runs show this to be right (I think), but once the = tach wraps,=20 the needle will drop down to approximately 1/2, giving me a reading = that is=20 closer to actual. This leads me to wonder if I can add a filter of = some sort,=20 to get the right signal. Maybe a good question for 'electric Bob'. = Tracy=20 suggested to Rusty that he could get a trigger signal from a coil = trigger.=20 However this should produce 1/2 the actual signal, when set for a 4 = cylinder.=20 So I theorized that a 2 stroke tach may produce an accurate signal so = I=20 grabbed a Bombardier tach and wired it into a coil trigger, but like = Rusty, I=20 found that this didn't work at all. I'm not certain why, as the coil = trigger=20 should give at least some signal. My new ski-doo has a digital engine=20 management computer, which provides the tach signal, so I'm thinking = that it=20 may be a high resolution signal, so I think maybe I'll pull it out and = take up=20 to the airport and try it.
    Is there anybody on this list that is using the EC2 and = getting an=20 accurate signal to drive an inexpensive, off the shelf tach? What = about those,=20 not using the EC2, how are you getting your trigger=20 signal?
 
    Any input would be greatly appreciated.

S. Todd Bartrim
Turbo 13B = RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

=   =20 "Whatever you vividly imagine, Ardently desire, Sincerely believe in,=20 Enthusiastically act upon, Must inevitably come to pass".

 
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