Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 123569 for flyrotary@lancaironline.net; Fri, 04 Jun 2004 09:05:13 -0400 Received: from rad ([65.6.194.9]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040604130444.TCJZ19385.imf25aec.mail.bellsouth.net@rad> for ; Fri, 4 Jun 2004 09:04:44 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Turbo boost limits in the EC2 Date: Fri, 4 Jun 2004 08:02:42 -0500 Message-ID: <003f01c44a34$38f79140$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0040_01C44A0A.50218940" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0040_01C44A0A.50218940 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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 =20 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 =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 =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... :-) =20 Cheers, Rusty (too deep for this early in the morning) ------=_NextPart_000_0040_01C44A0A.50218940 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

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

 
Like = most everyone else,=20 I don't like the fuel cut idea.  I still think something along the = lines of=20 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 this=20 really work? 
 
Naturally, I have to=20 mention that this should be considered a safety feature, and not = something to be=20 relied on daily.  I think the first priority should be to get an = effective=20 means of control of the turbo boost, which I commend several of you for = trying=20 to do. 
 
Once we get an effective = wastegate, a normal=20 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 = pressurized=20 line to the wastegate controller.  Since a solenoid is a "digital" = device=20 (either open or closed), the CPU sends a square wave pulse to control = it. =20 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=20 provide a pulsed signal for a solenoid, that varies from 0-100% duty=20 cycle.  This could also be done as a standalone unit I would = think. =20 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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