X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.73] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 894389 for flyrotary@lancaironline.net; Fri, 23 Dec 2005 20:01:42 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.73; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 23 Dec 2005 17:00:57 -0800 Message-ID: Received: from 4.171.147.167 by BAY115-DAV1.phx.gbl with DAV; Sat, 24 Dec 2005 01:00:56 +0000 X-Originating-IP: [4.171.147.167] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch Placements" Date: Fri, 23 Dec 2005 20:00:54 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008D_01C607FB.95033940" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Fri, 23 Dec 2005 20:00:54 -0500 X-OriginalArrivalTime: 24 Dec 2005 01:00:57.0298 (UTC) FILETIME=[7F86A320:01C60825] This is a multi-part message in MIME format. ------=_NextPart_000_008D_01C607FB.95033940 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jim, Not sure I followed the logic on using the same pot for program & = mixture. It just would not work unless there is something I missed = completely. I think there is a misunderstanding on the use of the = program knob. Also remember that the program knob is used for other = functions besides programming the mixture correction table. Having to = mess with the mixture while adjusting other things would be really bad.=20 I did think about using the program pot for mixture on B controller but = that would be very confusing when programming on the B controller for = most people. The mixture pot would then be used for program setting on = B controller. Actually this would work OK for me or someone who fully = understood the operation of the EC2. For a reference point, at least = 50% of the builders who call for support thinking that their EC2 is not = working correctly, answer the question "Does it do the same thing on B = controller?" by saying "I forgot to try that." I really can't expect = the average user to remember to reverse these two functions when = switching controllers. Tracy ----- Original Message -----=20 From: James Maher=20 To: Rotary motors in aircraft=20 Sent: Friday, December 23, 2005 6:32 PM Subject: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch = Placements" Tracy, Why not just use the "Program" pot for the mixture of one controller = say "A" and the Mixture pot for the "B" controller. This way you have true redundancy. I know that you use the program pot now for programming the mixture = but that never made much sense to me. If you are going to set the "Mixture" pot to a certain position and = then match that same position with the Program pot and read the program = pot's postion to set the mixture setting why not just read the Mixture pot's position and use it's = value to program the setting. This seems like it would also be more = accurate as the two pots at the same position could output slightly = different values. This provides true redundancy AND reduces the complexity of tuning. If the engine stumbles or quits just flip the A/B switch which should = be second nature anyway. Just an idea for you to ponder. Merry Chistmas Jim Maher Tracy Crook wrote: I have pondered various fail safe strategies for this scenario = (for example, make the B controller fixed at midrange mixture) but so = far have not been satisfied with any of them. Anyone have other ideas = to be considered? Tracy ----- Original Message -----=20 From: Perry Casson=20 To: Rotary motors in aircraft=20 Sent: Thursday, December 22, 2005 4:50 PM Subject: [FlyRotary] Question for Tracy - was: Off Topic "Switch = Placements" This reminds me to ask a question to Tracy that wanders through my = brain=20 when there is no civilization in sight out the cockpit windows. Tracy: If the mixture pot fails (not all that uncommon to get an = open=20 failure in potentiometers) what does the EC2 firmware do to the = mixture? Perry Casson -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_008D_01C607FB.95033940 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jim,
Not sure I followed the logic on using the same pot for program = &=20 mixture. It just would not work unless there is something I missed=20 completely.  I think there is a misunderstanding on the use of the=20 program knob.  Also remember that the program knob is used for = other=20 functions besides programming the mixture correction table.  = Having to=20 mess with the mixture while adjusting other things would be really=20 bad. 
 
I did think about using the program pot for mixture on B controller = but=20 that would be very confusing when programming on the B controller for = most=20 people.  The mixture pot would then be used for program = setting on B=20 controller.  Actually this would work OK for me or someone who = fully=20 understood the operation of the EC2.  For a reference point, = at least=20 50% of the builders who call for support thinking that their EC2 is not = working=20 correctly,  answer the question "Does it do the same thing on B=20 controller?" by saying "I forgot to try that."  I really can't = expect=20 the average user to remember to reverse these two functions when = switching=20 controllers.
 
Tracy
----- Original Message -----
From: James=20 Maher
To: Rotary motors in = aircraft
Sent: Friday, December 23, 2005 = 6:32=20 PM
Subject: [FlyRotary] Re: = Question for=20 Tracy - was: Off Topic "Switch Placements"

Tracy,
Why not just use the "Program" pot for the mixture of one=20 controller say "A" and the
Mixture pot for the "B" controller. This way you have true=20 redundancy.
I know that you use the program pot now for programming the = mixture but=20 that never made much sense to me.
If you are going to set the "Mixture" pot to a certain position = and then=20 match that same position with the Program pot and read the program = pot's=20 postion to set the mixture
setting why not just read the Mixture pot's position and use it's = value=20 to program the setting. This seems like it would also be more accurate = as the=20 two pots at the same position could output slightly different = values.
This provides true redundancy AND reduces the complexity of = tuning.
If the engine stumbles or quits just flip the A/B switch which = should be=20 second nature anyway.
Just an idea for you to ponder.
Merry Chistmas
Jim Maher

Tracy Crook <lors01@msn.com> = wrote:
 
   I have pondered various fail safe strategies for = this=20 scenario (for example, make the B controller fixed at midrange = mixture) but=20 so far have not been satisfied with any of them.  Anyone have = other=20 ideas to be considered?
 
Tracy
----- Original Message ----- =
From: Perry=20 Casson
To: Rotary motors in = aircraft=20
Sent: Thursday, December = 22, 2005=20 4:50 PM
Subject: [FlyRotary] = Question for=20 Tracy - was: Off Topic "Switch Placements"

This reminds me to ask a question to Tracy that = wanders=20 through my brain
when there is no civilization in sight out = the=20 cockpit windows.

Tracy: If the mixture pot fails (not all = that=20 uncommon to get an open
failure in potentiometers) what does = the EC2=20 firmware do to the mixture?

Perry=20 Casson



--
Homepage:  http://www.flyrotary.com/
Archi= ve=20 and UnSub:   http://mail.lanca= ironline.net/lists/flyrotary/

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