Return-Path: Received: from out008.verizon.net ([206.46.170.108] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 123890 for flyrotary@lancaironline.net; Fri, 04 Jun 2004 11:14:15 -0400 Received: from verizon.net ([4.12.145.173]) by out008.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040604151342.HACB27801.out008.verizon.net@verizon.net> for ; Fri, 4 Jun 2004 10:13:42 -0500 Message-ID: <40C0919A.3060303@verizon.net> Date: Fri, 04 Jun 2004 11:13:30 -0400 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Turbo boost limits in the EC2 References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------090000020807020208010306" X-Authentication-Info: Submitted using SMTP AUTH at out008.verizon.net from [4.12.145.173] at Fri, 4 Jun 2004 10:13:42 -0500 This is a multi-part message in MIME format. --------------090000020807020208010306 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Any chance these new scrapped ducts would fit my RV-3? Finn Ed Anderson wrote: > Hey! 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 ----- > From: Russell Duffy > To: Rotary motors in aircraft > 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? > > 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. > > 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) > > > > --------------090000020807020208010306 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Any chance these new scrapped ducts would fit my RV-3?

Finn

Ed Anderson wrote:
Message
Hey! 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 -----
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? 
 
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. 
 
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)




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