Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 604940 for flyrotary@lancaironline.net; Wed, 12 Jan 2005 13:47:45 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=sqpilot@bellsouth.net Received: from [216.78.114.21] by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050112184710.VWPG1992.imf16aec.mail.bellsouth.net@[216.78.114.21]> for ; Wed, 12 Jan 2005 13:47:10 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.6.11]); Wed, 12 Jan 2005 12:47:02 -0600 From: "Paul" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: props again Date: Wed, 12 Jan 2005 12:46:53 -0600 Message-ID: <003b01c4f8d7$1882aa10$15724ed8@paul52u7f5qyav> X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2616 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: Importance: Normal Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-41E570A61CAF=======" --=======AVGMAIL-41E570A61CAF======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01C4F8A4.CDE83A10" ------=_NextPart_000_003C_01C4F8A4.CDE83A10 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy Sent: Wednesday, January 12, 2005 12:40 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: props again You are correct in that the MicroTech ECU has a hard and soft rev limiting feature..I will get back into the manual and see what I can learn. My understanding of rev limits is that a hard limit will shut you down completely, at least until the condition is cleared, and you'd certainly notice that :-) Soft limits are supposed to reduce power as needed to keep you where the limit is set. I've read that some of these are pretty smooth, and you won't necessarily even know it's happening. One technique is to remove ignition pulses in an intelligent manner. For example, perhaps it will remove every 4th ignition pulse if you start to approach the limit, then if you continue to advance the throttle, maybe it has to take out every 3rd, then maybe every other pulse. This might even explain your engine behavior on the first flight. Some systems can do this with fuel as well, but I think it's more common to do ignition. Again, I'm not familiar with the MicroTech, so this is just a guess based on reading about other ECUs. Good luck, Rusty Thanks, Rusty.I'm heading out there now to play with it some more and just maybe stumble upon something useful. Paul Conner ------=_NextPart_000_003C_01C4F8A4.CDE83A10 Content-Type: text/html; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Message

 

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy
Sent: = Wednesday, January 12, = 2005 12:40 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = props again

 

You are correct = in that the MicroTech ECU has a hard and soft rev limiting feature….I will = get back into the manual and see what I can learn.   

=

 

My = understanding of rev limits is that a hard limit will shut you down completely, at = least until the condition is cleared, and you'd certainly notice that = :-)  Soft limits are supposed to reduce power as needed to keep you where the = limit is set.  I've read that some of these are pretty smooth, and you won't = necessarily even know it's happening.  One technique is to remove ignition = pulses in an intelligent manner.  For example, perhaps it will remove every = 4th ignition pulse if you start to approach the limit, then if you continue = to advance the throttle, maybe it has to take out every 3rd, then maybe = every other pulse. This might even explain your engine behavior on the = first flight.  Some systems can do this with fuel as well, but I think = it's more common to do ignition.  Again, I'm not familiar with the = MicroTech, so this is just a guess based on reading about other = ECUs.

 

Good = luck,

Rusty =

 

Thanks, Rusty…I’m = heading out there now to play with it some more and just maybe stumble upon = something useful. Paul Conner

 

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