X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.84] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 893729 for flyrotary@lancaironline.net; Fri, 23 Dec 2005 11:07:08 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.84; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 23 Dec 2005 08:02:38 -0800 Message-ID: Received: from 4.171.129.102 by BAY115-DAV12.phx.gbl with DAV; Fri, 23 Dec 2005 16:02:37 +0000 X-Originating-IP: [4.171.129.102] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Question for Tracy - was: Off Topic "Switch Placements" Date: Fri, 23 Dec 2005 11:02:34 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0182_01C607B0.60F90990" 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 11:02:34 -0500 X-OriginalArrivalTime: 23 Dec 2005 16:02:38.0219 (UTC) FILETIME=[4BC64DB0:01C607DA] This is a multi-part message in MIME format. ------=_NextPart_000_0182_01C607B0.60F90990 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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_0182_01C607B0.60F90990 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Good question Perry.
 
  Answer would depend on the exact nature of the = 'open' . =20 Open at ground end, hot end, or wiper.   Answers in = order: =20 mixture goes full rich, full lean, wanders around at last set = point.  The=20 pot used is a high rel part rated for 500,000 cycles but of course = anything can=20 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 will=20 drift at this point and proper pilot response would be to move = mixture to a=20 slightly richer setting, land, get the pot replaced before flying = again. =20 Thanks for the mental nudge, I need to add this to the instruction = manual.
 
   I have pondered various fail safe strategies for this = scenario=20 (for example, make the B controller fixed at midrange mixture) but so = far have=20 not been satisfied with any of them.  Anyone have other ideas to be = considered?
 
Tracy
----- Original Message -----
To: Rotary motors in = aircraft
Sent: Thursday, December 22, = 2005 4:50=20 PM
Subject: [FlyRotary] Question = for Tracy -=20 was: Off Topic "Switch Placements"

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

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

Perry Casson



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