Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 123634 for flyrotary@lancaironline.net; Fri, 04 Jun 2004 09:56:12 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i54DseVw026317 for ; Fri, 4 Jun 2004 09:54:41 -0400 (EDT) Message-ID: <002401c44a3b$7c81be20$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Turbo boost limits in the EC2 Date: Fri, 4 Jun 2004 09:54:42 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0021_01C44A19.F52FB9C0" 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_0021_01C44A19.F52FB9C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageHey! Hey! All this time??. Let me tell you, Rusty being = "retired" is hard work!{:>) I just expended over a week on the new = radiator inlet ducts, only to decide the curve profile was not what I = wanted and the glass work was crappy. They would have worked, but what = I have now works fine, I just want to try to get closer to a optimum = set up - so back to the drawing boards and K&W. After rereading K&W material on the streamline duct and finally having = it click as to what the one figure was portraying, my understanding has = considerably improved. I can now make an approximation as to how much = pressure recovery I lose in truncating the duct length to fix under the = cowl. So new duct molds in the process as we speak. I am also continuing in my quest to learn how to program a microchip = which would be the thing needed (desirable) to implement such a "smart" = waste gate controller. Hey, I have gotten it to the point that it = actually blinks at me and displays Numbers representing the duty cycle = of the pulse train the chip can generate. So it would seem that with = using the chip's A/D converter tied into a barometric sensor in the = intake to drive the duty cycle of the pulse you could control a waste = gate servo. Hummm. But, still fairly slow going - next step is to have it display on an LCD = screen. I know seems trivial to you computer types, but getting this = done in assembly language is a major step for me. Well, would like to chat more, but time is short so have to run {:>) Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Friday, June 04, 2004 9:02 AM Subject: [FlyRotary] Re: Turbo boost limits in the EC2 Yes, I tend to agree. Tracy - are you listening? Does this make sense = to you? Anyone else care to comment? I'd really like to get something = built into the EC2....soon. Regards, John Like most everyone else, I don't like the fuel cut idea. I still = think something along the lines of an ignition retard would be best, but = I have to admit to never trying that. What we'd have to figure out is = how much to retard it, and will this really work? =20 Naturally, I have to mention that this should be considered a safety = feature, and not something to be relied on daily. I think the first = priority should be to get an effective means of control of the turbo = boost, which I commend several of you for trying to do. =20 Once we get an effective wastegate, a normal pressure type controller = will work fine, except that it will be a differential device, rather = than being referenced to absolute pressure. Here is where Tracy could = provide electronic wastegate control, just as it's done in the FD. In = the car, to raise the pressure above the normal wastegate controller, = they use a solenoid to create a "leak" in the pressurized line to the = wastegate controller. Since a solenoid is a "digital" device (either = open or closed), the CPU sends a square wave pulse to control it. The = duty cycle of the pulse determines the average open time of the = solenoid. Since Tracy is already sensing the MAP, he could use that to = provide a pulsed signal for a solenoid, that varies from 0-100% duty = cycle. This could also be done as a standalone unit I would think. = Maybe since Ed has all this time on his hands... :-) Cheers, Rusty (too deep for this early in the morning) ------=_NextPart_000_0021_01C44A19.F52FB9C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Hey! Hey!  All this time??.  = Let me tell=20 you,  Rusty being "retired" is hard work!{:>)  I just = expended over=20 a week on the new radiator inlet ducts, only to decide the curve profile = was not=20 what I wanted and the glass work was crappy.  They would have = worked, but=20 what I have now works fine,  I just want to try to get closer to a = optimum=20 set up - so back to the drawing boards and K&W.
 
After rereading K&W material on the = streamline=20 duct and finally having it click as to what the one figure was = portraying, my=20 understanding has considerably improved.  I can now make an = approximation=20 as to how much pressure recovery I lose in truncating the duct length to = fix=20 under the cowl.  So new duct molds in the process as we = speak.
 
I am also continuing in my quest to = learn how to=20 program a microchip which would be the thing needed (desirable) to = implement=20 such a "smart" waste gate controller.  Hey, I have gotten it to the = point=20 that it actually blinks at me and displays Numbers representing the duty = cycle=20 of the pulse train the chip can generate.  So it would seem that = with using=20 the chip's A/D converter tied into a barometric sensor in the = intake to=20 drive the duty cycle of the pulse you could control a waste gate = servo. =20 Hummm.
But, still fairly slow going - next = step is to have=20 it display on an LCD screen.  I know seems trivial to you computer = types,=20 but getting this done in assembly language is a major step for = me.
 
Well, would like to chat more, but time = is short so=20 have to run {:>)
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Friday, June 04, 2004 = 9:02 AM
Subject: [FlyRotary] Re: Turbo = boost=20 limits in the EC2

Yes, I tend to agree. Tracy - are you listening? = Does this=20 make sense to you? Anyone else care to comment? I'd really like to get = something built into the EC2....soon. Regards, John

 
Like = most everyone=20 else, I don't like the fuel cut idea.  I still think something = along the=20 lines of an ignition retard would be best, but I have to admit to = never trying=20 that.  What we'd have to figure out is how much to retard it, and = will=20 this really work? 
 
Naturally, I have to=20 mention that this should be considered a safety feature, and not = something to=20 be relied on daily.  I think the first priority should be to get = an=20 effective means of control of the turbo boost, which I commend several = of you=20 for trying to do. 
 
Once we get an effective = wastegate, a=20 normal pressure type controller will work fine, except that = it will be a=20 differential device, rather than being referenced to absolute = pressure. =20 Here is where Tracy could provide electronic wastegate control, just = as it's=20 done in the FD.   In the car, to raise the pressure above = the normal=20 wastegate controller, they use a solenoid to create a "leak" in the=20 pressurized line to the wastegate controller.  Since a solenoid = is a=20 "digital" device (either open or closed), the CPU sends a square wave = pulse to=20 control it.  The duty cycle of the pulse determines the = average open=20 time of the solenoid.  Since Tracy is already sensing the MAP, he = could=20 use that to provide a pulsed signal for a solenoid, that varies from = 0-100%=20 duty cycle.  This could also be done as a standalone unit I would = think.  Maybe since Ed has all this time on his hands... = :-)
 
Cheers,
Rusty (too deep for this early = in the=20 morning)




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