X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtai18.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 894368 for flyrotary@lancaironline.net; Fri, 23 Dec 2005 19:35:01 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao04.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20051223202109.KMNS17690.fed1rmmtao04.cox.net@BigAl> for ; Fri, 23 Dec 2005 15:21:09 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch Placements" Date: Fri, 23 Dec 2005 12:23:02 -0800 Message-ID: <000001c607fe$ad9fb390$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C607BB.9F7C7390" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C607BB.9F7C7390 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch Placements" =20 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)?? =20 Full rich. Turn the secondary injectors off - intermittently turn them = all off if bogging. =20 As I understand it; turning off either set of injectors doubles the = pulse width of the other, so probably wouldn't help - except make it easier to turn off the other intermittently. Perhaps some experimenting by turning = the knob suddenly to full rich would be informative. =20 Full Lean. Intermittently turn on cold start or repeatedly punch = program button in 0 mode =20 On mine, pushing the Prog button in 0 mode does nothing (programming disabled). The cold start switch may do the job, but with the Prog knob turned to the right, pressing the button in mode 3 will step increase = flow to all injectors. =20 Happy Holidays to all! =20 Al =20 Wander around. Figure that on average it will be "just" right {:>). =20 Ed A =20 ----- 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" =20 Good question Perry. =20 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. =20 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. =20 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? =20 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" =20 This reminds me to ask a question to Tracy that wanders through my brain = 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_0001_01C607BB.9F7C7390 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: Question for Tracy - was: Off Topic = "Switch Placements"

 

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)??

 <= /font>

Full rich.  Turn the secondary injectors off - intermittently turn them = all off if bogging.

 

As I understand it; turning off = either set of injectors doubles the pulse width of the other, so probably = wouldn’t help – except make it easier to turn off the other intermittently. Perhaps some experimenting by turning the knob suddenly to full rich = would be informative.

 

Full Lean.  Intermittently turn on cold start or repeatedly punch = program button in 0 mode

 

On mine, pushing the Prog button = in 0 mode does nothing (programming disabled).  The cold start switch may do = the job, but with the Prog knob turned to the right, pressing the button in = mode 3 will step increase flow to all injectors.

 

Happy Holidays to = all!

 

Al

 

Wander around.  Figure that on average it will be "just" right = {:>).

 <= /font>

Ed = A

 <= /font>

=

----- Original Message -----

From: Tracy Crook =

Sent: = Friday, December 23, 2005 = 11:02 AM

Subject: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch = Placements"

 <= /font>

Good question Perry.

 <= /font>

  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.

 <= /font>

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.

 <= /font>

   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?

 <= /font>

Tracy

=

----- Original Message -----

From: Perry Casson

Sent: = Thursday, December 22, 2005 4:50 = PM

Subject: [FlyRotary] Question for Tracy - was: Off Topic "Switch = Placements"

 <= /font>

This reminds me to ask a question to Tracy that wanders through my brain
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
failure in potentiometers) what does the EC2 firmware do to the = mixture?

Perry Casson



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