Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3145416 for flyrotary@lancaironline.net; Sun, 04 Apr 2004 12:59:24 -0400 Received: from rad ([68.221.181.28]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040404165925.EFFR1775.imf19aec.mail.bellsouth.net@rad> for ; Sun, 4 Apr 2004 12:59:25 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] idle speeds Date: Sun, 4 Apr 2004 11:59:27 -0500 Message-ID: <026001c41a66$309f7740$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0261_01C41A3C.47C96F40" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0261_01C41A3C.47C96F40 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Last week we had some discussion on idle speeds, and I think the = consensus was to keep it around 2000 or a little under. Just for information for = other canard pusher people, I think 2000 is going to be a real problem for me. = At the current 1850 setting with the big 3 66/84 prop I have on she's = pushing hard against the brakes. I think I could taxi the length of the runway = at idle and be doing 30/40 kts at the end. On a short (3400) runway the = only way to stop might be kill the engine once on the ground, or even on = short final. So I need to get the idle speed way down. John Slade (more power = than I know what to do with) You're right John. I don't see how people get away with 2000 rpm. I = could have done that on the earlier (drag chute) cowl configuration, but as = the plane gets cleaned up, it's going to be hard to slow down. =20 On the old configuration, I could idle down to 1000-1200 rpm pretty = easily, but I set it at 1500, which is about 700 prop rpm. This is about as low = as I can comfortably go now though. Until I re-work the intake to get the injectors closer to the engine, I have to consider the artificially low = rpm that I will get if I chop the throttle suddenly to idle. With the idle = set at 1500, I sag to about 1200, stinking rich, until I open the throttle a = bit to correct it. If I set the idle to 1200 now, the artificially low idle would likely drop to 900, and the engine might quit. Eventually, when = I really get this thing working properly (with the new intake), I'd like = to get the prop speed as low as possible, which I see as one of the = advantages to having a redrive. =20 Cheers, Rusty (winds not so bad as forecast...) ------=_NextPart_000_0261_01C41A3C.47C96F40 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Last week we had some discussion on idle speeds, and I = think the=20 consensus was to keep it around 2000 or a little under. Just for = information for=20 other canard pusher people, I think 2000 is going to be a real problem = for me.=20 At the current 1850 setting with the big 3 66/84 prop I have on she's = pushing=20 hard against the brakes. I think I could taxi the length of the runway = at idle=20 and be doing 30/40 kts at the end. On a short (3400) runway the only way = to stop=20 might be kill the engine once on the ground, or even on short final. So = I need=20 to get the idle speed way down. John Slade (more power than I know what = to do=20 with)

You're=20 right John.   I don't see how people get away with 2000 = rpm.  I=20 could have done that on the earlier (drag chute) cowl configuration, but = as the=20 plane gets cleaned up, it's going to be hard to slow down. =20

On the old = configuration,=20 I could idle down to 1000-1200 rpm pretty easily, but I set it=20 at 1500, which is about 700 prop rpm.  This is about as low as = I can=20 comfortably go now though.  Until I re-work the intake to get the = injectors=20 closer to the engine, I have to consider the artificially low rpm that I = will=20 get if I chop the throttle suddenly to idle.  With the idle set at = 1500, I=20 sag to about 1200, stinking rich, until I open the throttle a bit to = correct=20 it.  If I set the idle to 1200 now, the artificially low idle would = likely=20 drop to 900, and the engine might quit.   Eventually, when I = really=20 get this thing working properly (with the new intake), I'd like to get = the prop=20 speed as low as possible, which I see as one of the advantages to = having a=20 redrive. 

Cheers,

Rusty = (winds not so bad as=20 forecast...)

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