Return-Path: <13brv3@bellsouth.net> Received: from [205.152.59.69] (HELO imf21aec.bellsouth.net) by logan.com (CommuniGate Pro SMTP 4.1b9) with ESMTP id 2474123 for flyrotary@lancaironline.net; Mon, 14 Jul 2003 00:47:36 -0400 Received: from rad ([68.212.0.192]) by imf21aec.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030714044735.PTXV16013.imf21aec.bellsouth.net@rad> for ; Mon, 14 Jul 2003 00:47:35 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: 2nd and 3rd run logs Date: Sun, 13 Jul 2003 23:47:38 -0500 Message-ID: <000401c349c3$0d4e1fe0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C34999.247817E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C34999.247817E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable As I understand it, the injectors are staged. The secondaries only cut = in at a certain rpm. So, if you're rpm is below the staging point, and you = kill the primaries you have no fuel and engine will quit. Above the staging = point the secondaries would be supplying fuel. Just a theory, but it makes = sense to me... Regards, John =20 I was thinking that Tracy took this into account, but after reading the instructions again, it does look like he just depends on the cold start function to add fuel. I guess you won't be using any power setting = below the secondary staging point during normal flight, except for maybe a = steep descent. =20 =20 Of course I have to wonder, why not just run them all, all the time? = Mazda probably made them staged for emissions, or drivability, but there are = FD guys running four 1600 injectors, who seem to idle just fine with two = 1600 injectors. Surely I can idle with four 550's. I think the staging = point is adjustable, but I'll have to look at the manual again tomorrow. I might just be tempted to try running all four full time. =20 =20 Rusty =20 ------=_NextPart_000_0005_01C34999.247817E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

As I understand it, the injectors are staged. The secondaries only cut in at a certain rpm. So, if you're rpm is below the staging point, and you kill the primaries you have no fuel and engine = will quit. Above the staging point the secondaries would be supplying fuel. = Just a theory, but it makes sense to me...

Regards,

John

 

I was thinking that = Tracy took this into = account, but after reading the instructions again, it does look like he just = depends on the cold start function to add fuel.  I guess you won’t be = using any power setting below the secondary staging point during normal flight, = except for maybe a steep descent. 

 

Of course I have to wonder, why not = just run them all, all the time?  Mazda probably made them staged for emissions, or drivability, but there are FD guys running four 1600 = injectors, who seem to idle just fine with two 1600 injectors.  Surely I can idle = with four 550’s.  I think the staging point is adjustable, but = I’ll have to look at the manual again tomorrow.  I might just be tempted = to try running all four full time. 

 

Rusty

 

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