Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3145300 for flyrotary@lancaironline.net; Sun, 04 Apr 2004 12:05:21 -0400 Received: from BigAl ([68.107.116.221]) by fed1rmmtao12.cox.net (InterMail vM.6.01.03.01 201-2131-111-101-20040311) with ESMTP id <20040404160521.DOGR26178.fed1rmmtao12.cox.net@BigAl> for ; Sun, 4 Apr 2004 12:05:21 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] idle speeds Date: Sun, 4 Apr 2004 09:05:28 -0700 Message-ID: <000a01c41a5e$a5b188a0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000B_01C41A23.F952B0A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 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_000B_01C41A23.F952B0A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Subject: [FlyRotary] idle speeds =20 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) =20 John; =20 Yeah, I'd think we'd like to get the prop down to 700 or less. I'll have = a 3 66/85 on my Velocity. If your engine will run nicely at a lower speed - great. I found that on the dyno my 20B would do fine to 1500; below = that we had some tuning problems with rich mixture. That was before installing = MAP referenced pressure regulator and some EC2 tweaking to reduce the flow = of the 570 cc/min primary injectors to closer match the 500 cc/min = secondary. I'm hoping for a nice idle around 1200. =20 The low speed operation likely depends on your induction system design, = and where the injectors are located. I have primary in the housings and secondary about 13" upstream. =20 ------=_NextPart_000_000B_01C41A23.F952B0A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Subject: [FlyRotary] idle speeds

 

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)

 

John;

 <= /font>

Yeah, = I’d think we’d like to get the prop down to 700 or less. I’ll have a 3 = 66/85 on my Velocity. If your engine will run nicely at a lower speed - great. =  I found that on the dyno my 20B would do fine to 1500; below that we had = some tuning problems with rich mixture. That was before installing MAP = referenced pressure regulator and some EC2 tweaking to reduce the flow of the 570 = cc/min primary injectors to closer match the 500 cc/min secondary.  = I’m hoping for a nice idle around 1200.

 <= /font>

The low speed operation likely depends on your induction system design, and where the injectors are located.  I have primary in the housings and = secondary about 13” upstream. 

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