X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.81] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 894399 for flyrotary@lancaironline.net; Fri, 23 Dec 2005 20:18:53 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.81; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 23 Dec 2005 17:14:25 -0800 Message-ID: Received: from 4.171.147.167 by BAY115-DAV9.phx.gbl with DAV; Sat, 24 Dec 2005 01:14:24 +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 20:14:20 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0099_01C607FD.75743C30" 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 20:14:20 -0500 X-OriginalArrivalTime: 24 Dec 2005 01:14:25.0079 (UTC) FILETIME=[61003C70:01C60827] This is a multi-part message in MIME format. ------=_NextPart_000_0099_01C607FD.75743C30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Cold start on for the full lean condition is a good idea. Punching the = program button in mode 0 (Primer function) will not work because the EC2 = disables the primer when it senses that the engine is running. For full rich, Turning a set of injectors off would be good except that = it doubles the injection on the others at the same time. (I sense a = suggestion on the way for yet another switch to disable the injector = doubling function : ) =20 Another thing to do in an emergency would be to cycle the fuel pump on & = off to lower the fuel pressure in order to lean the mixture. Or, = install a fuel pump controller to drop the pressure like some late model = cars do. (No! Just kidding!! even though it would work) Tracy Thanks for the info, Tracy. Until a decision is make on alternatives, = what might be good courses of action (in order to get to a place to = safely land)?? Full rich. Turn the secondary injectors off - intermittently turn = them all off if bogging. Full Lean. Intermittently turn on cold start or repeatedly punch = program button in 0 mode Wander around. Figure that on average it will be "just" right {:>). Ed A ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Friday, December 23, 2005 11:02 AM Subject: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch = Placements" Good question Perry. Answer would depend on the exact nature of the 'open' . Open at = ground end, hot end, or wiper. Answers in order: mixture goes full = rich, full lean, wanders around at last set point. The pot used is a = high rel part rated for 500,000 cycles but of course anything can fail. Most pot failures are 'dead spots' where the wiper goes open at a = certain spot (usually near where it is used the most). Mixture will = drift at this point and proper pilot response would be to move mixture = to a slightly richer setting, land, get the pot replaced before flying = again. Thanks for the mental nudge, I need to add this to the = instruction manual. 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_0099_01C607FD.75743C30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Cold start on for the full lean condition is a good=20 idea. Punching the program button in mode 0 (Primer=20 function) will not work because the EC2 disables the primer = when it=20 senses that the engine is running.
 
For full rich, Turning a set of injectors off would be good = except=20 that it doubles the injection on the others at the same time.  (I = sense a=20 suggestion on the way for yet another switch to disable the injector = doubling=20 function : ) 
 
Another thing to do in an emergency would be to cycle the fuel pump = on=20 & off to lower the fuel pressure in order to lean the mixture.  = Or,=20 install a fuel pump controller to drop the pressure like some late model = cars=20 do.  (No! Just kidding!! even though it would work)
 
Tracy
Thanks for the info, Tracy.  = Until a=20 decision is make on alternatives, what might be good courses of action = (in=20 order to get to a place to safely land)??
 
Full rich.  Turn the secondary = injectors off=20 - intermittently turn them all off if bogging.
Full Lean.  Intermittently turn = on cold=20 start or repeatedly punch program button in 0 mode
Wander around.  Figure that on = average it=20 will be "just" right {:>).
 
Ed A
 
----- Original Message -----
From:=20 Tracy Crook=20
To: Rotary motors in = aircraft=20
Sent: Friday, December 23, = 2005 11:02=20 AM
Subject: [FlyRotary] Re: = Question for=20 Tracy - was: Off Topic "Switch Placements"

Good question Perry.
 
  Answer would depend on the exact nature of the=20 'open' .  Open at ground end, hot end, or = wiper.  =20 Answers in order:  mixture goes full rich, full lean, wanders = around at=20 last set point.  The pot used is a high rel part rated for = 500,000=20 cycles but of course anything can fail.
 
Most pot failures are 'dead spots' where the wiper goes = open at a=20 certain spot (usually near where it is used the most).  = Mixture=20 will drift at this point and proper pilot response would be to = move=20 mixture to a slightly richer setting, land, get the pot replaced = before=20 flying again.  Thanks for the mental nudge, I need to add this = to the=20 instruction manual.
 
   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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