X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-2.exch003intermedia.net ([207.5.74.29] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTPS id 3740263 for flyrotary@lancaironline.net; Tue, 30 Jun 2009 13:50:32 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.29; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-2.exch003intermedia.net ([207.5.74.29]) with mapi; Tue, 30 Jun 2009 10:49:56 -0700 From: Jeff Whaley To: Rotary motors in aircraft Date: Tue, 30 Jun 2009 10:49:55 -0700 Subject: RE: [FlyRotary] Re: Below staging Thread-Topic: [FlyRotary] Re: Below staging Thread-Index: Acn5pZDFIZiL6Z7SSdOUFgvQh3YG8wAAE3KQ Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/related; boundary="_005_C03ABB0A7362B84BB53D544B3C305E0E012DC07D1883EXVMBX0035e_"; type="multipart/alternative" MIME-Version: 1.0 --_005_C03ABB0A7362B84BB53D544B3C305E0E012DC07D1883EXVMBX0035e_ Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E012DC07D1883EXVMBX0035e_" --_000_C03ABB0A7362B84BB53D544B3C305E0E012DC07D1883EXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, Tracy does not insist that you use the DPDT switches - in the manual th= ey are listed as optional. I looked at the circuit and concluded that in order to have circuit breaker= s plus DPDT switches, my parts count was going to double; with panel space = at a premium, I bought SPDT switches with built-in circuit breakers. Also, I thought the chance of an injector failing in flight was pretty remo= te - as mentioned in the manual. I do test both sets of injectors before flight, but have been doing it abov= e the staging point - PRI:OFF-CS:ON; CS:OFF-PRI:ON ... repeat with SEC. Thi= s gives you on-the-ground experience of what a bad set of injectors does to= your engine plus the effect of what the CS is doing. I do agree that the DPDT switches would be less awkward but I will leave th= ings as-is for now. Jeff From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Al Gietzen Sent: Tuesday, June 30, 2009 2:05 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Below staging Subject: [FlyRotary] Re: Below staging ... was Re: More progress, more ques= tions.... I do not have the DPDT switches but rather have separate PRI and SEC power = switches plus the Cold Start switch. To test the above feature (which I have not) I would have to first ensure t= hat the Cold Start switch is ON ... right now if I disable the PRI-only bel= ow staging point, my engine quits. Jeff I'm curious why you would chose not to use the DPDT switch as suggested. I= think the point is that disabling each set, one at a time, should be part = of a run-up check before takeoff to insure all the injectors are working. = Seems a bit awkward to have to do a coordinated switching of the CS switch. Same issue if you have an injector failure in flight. Even above the stage= point, the CS circuit has to be closed to run with one set disabled. You'= d like to quickly isolate/correct the problem by disabling one set at a tim= e. Al G From: "Bill Schertz" Subject: Re: [FlyRotary] More progress, more questions.... Date: Sat, 27 Jun 2009 13:36:36 -0500 To: "Rotary motors in aircraft" [cid:image001.gif@01C9F984.E0719830] [cid:image002.gif@01C9F984.E0719830] Chris, When you shut off the primaries, the secondary's are automatically turned o= n. From: "Ed Anderson" Subject: RE: [FlyRotary] More progress, more questions.... Date: Sat, 27 Jun 2009 07:59:14 -0400 To: "'Rotary motors in aircraft'" [cid:image001.gif@01C9F984.E0719830] [cid:image002.gif@01C9F984.E0719830] Hi Chris, Just wanted to mention that when you used the "Injector Disable" switch to turn off the primary injectors - the EC2 will then automatically turn on th= e secondary injectors regardless of whether you are above or below the stagin= g point. They in effect become your primary injectors. This is assuming you have the injector switches wired per Tracy's recommendation and of course the "disable" switch is ON for your secondary injectors. So assuming your EC2 is set up properly the engine should idle on either pair (with perhaps some minor tweaking of the mixture control). --_000_C03ABB0A7362B84BB53D544B3C305E0E012DC07D1883EXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al, Tracy does not insist that you use the DPDT switches - i= n the manual they are listed as optional.

I looked at the circuit and concluded that in order to have circuit breakers plus DPDT switches, my parts count was going to double; wi= th panel space at a premium, I bought SPDT switches with built-in circuit breakers.

Also, I thought the chance of an injector failing in flight = was pretty remote – as mentioned in the manual.

 

I do test both sets of injectors before flight, but have bee= n doing it above the staging point – PRI:OFF-CS:ON; CS:OFF-PRI:ON ̷= 0; repeat with SEC. This gives you on-the-ground experience of what a bad set = of injectors does to your engine plus the effect of what the CS is doing.=

I do agree that the DPDT switches would be less awkward but = I will leave things as-is for now.

Jeff

 

From: Rotary motors= in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietze= n
Sent: Tuesday, June 30, 2009 2:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Below staging

 

Subject: [FlyRotary] Re: Below staging ..= . was Re: More progress, more questions....

 

I do not have the DPDT switches but rather have separate= PRI and SEC power switches plus the Cold Start switch.

To test the above feature (which I have not) I would hav= e to first ensure that the Cold Start switch is ON … right now if I disable the PRI-only below staging point, my engine quits.<= /o:p>

Jeff

 

I’m curious why you would chose not to use the DPDT switch as suggested.  I think the point is that disabling each set= , one at a time, should be part of a run-up check before takeoff to insur= e all the injectors are working.  Seems a bit awkward to have to do = a coordinated switching of the CS switch.

 

Same issue if you have an injector failure in flight.  Even above the stage point, the CS circuit has to be closed to run with= one set disabled.  You’d like to quickly isolate/correct the pro= blem by disabling one set at a time.

 

Al G

 

 

From:

"Bill Schertz" <wschertz@comcast.ne= t>

Subject:

Re: [FlyRotary] More progress, more questions...= .

Date:

Sat, 27 Jun 2009 13:36:36 -0500

To:

"Rotary motors in aircraft" <flyrotary@lancaironline.net>

3D"Message

3D"Undecoded

Chris,
When you shut off the primaries, the secondary's are automatically turned= on.

From:

"Ed Anderson" <eanderson@carolina.rr.com>

Subject:

RE: [FlyRotary] More progress, more questions...= .

Date:

Sat, 27 Jun 2009 07:59:14 -0400

To:

"'Rotary motors in aircraft'" <flyrotary@lancaironline.net>

3D"Message

3D"Undecoded

Hi Chris,

Just wanted to mention that when you used the "Injector Disable"= ; switch to
turn off the primary injectors - the EC2 will then automatically turn on = the
secondary injectors regardless of whether you are above or below the stag= ing
point. They in effect become your primary injectors. This is assuming you=
have the injector switches wired per Tracy's recommendation and of course=
the "disable" switch is ON for your secondary injectors.

So assuming your EC2 is set up properly the engine should idle on either<= br> pair (with perhaps some minor tweaking of the mixture control).

 <= /p>

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