X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from access.aic-fl.com ([207.30.253.2] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2042286 for flyrotary@lancaironline.net; Sun, 13 May 2007 14:02:25 -0400 Received-SPF: softfail receiver=logan.com; client-ip=207.30.253.2; envelope-from=unicorn@gdsys.net Received: from main (gdsi-43.gdsys.net [207.30.255.43]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Sun, 13 May 2007 12:58:29 -0500 Message-ID: <002b01c79588$d1ee8870$2bff1ecf@main> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: EC2 smoke question Date: Sun, 13 May 2007 13:02:06 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0028_01C7955E.E87C8E90" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0028_01C7955E.E87C8E90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The close-up slide throttle is driven by the exagerated idle problem. I = fell for that in my initial work with the single rotor. First I had only = one side port. The idea was to add the P-Port and run the engine on = both. Because of port timing interferances(in my opinion) this did not = work. At the same time, I found out that the engine will idle at 1300RPM = with P-Port only, with or without a close-up butterfly, vs 2000RPM by = some claims. This put an end to any close-up throttle device on my = engine.=20 One does not any need lower idle on an engine running at 7000 or more = RPM.=20 The issue is certainly an interesting scientific problem, however, not = necessarily one of any practical purpose on airplane use. Richard Sohn N2071U ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 13, 2007 10:27 AM Subject: [FlyRotary] Re: EC2 smoke question If the slide-throttle was installed Upstream of the plenum it would = work fine. But this would make no sense for the slide-throttle that = Paul designed. It is a two-holer designed to be installed right next = to the engine ports (P-ported engine). A single hole would be the best = for an upstream design.=20 FWIW, I don't get the whole rational for the slide-throttle. True, it = it theoretically the best performing solution but I live in the real = world where the small theoretical advantage is outweighed by other = factors. TJ, I forgot to comment on the FBW. It is near (near being a = relative term : ) production status but the hold modes are still being = worked on and will not be finished before the RV-8 flys and it has been = flight proven. I don't sell flight critical stuff that I haven't risked = my own tender pink skin on first.=20 Tracy (Last EC2 update out the door, departing for Colorado Tuesday) ------=_NextPart_000_0028_01C7955E.E87C8E90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The close-up slide throttle is driven by the = exagerated=20 idle problem. I fell for that in my initial work with the single rotor. = First I=20 had only one side port. The idea was to add the P-Port and run the = engine on=20 both. Because of port timing interferances(in my opinion) this did not = work. At=20 the same time, I found out that the engine will idle at 1300RPM with = P-Port=20 only, with or without a close-up butterfly, vs 2000RPM by some claims. = This put=20 an end to any close-up throttle device on my engine.
One does not any need lower idle on an engine = running at=20 7000 or more RPM.
The issue is certainly an interesting scientific = problem,=20 however, not necessarily one of any practical purpose on airplane=20 use.
 
Richard Sohn
N2071U
----- Original Message -----
From:=20 Tracy = Crook
Sent: Sunday, May 13, 2007 = 10:27 AM
Subject: [FlyRotary] Re: EC2 = smoke=20 question

If the slide-throttle was installed Upstream of the plenum it = would work=20 fine.  But this would make no sense for the slide-throttle that = Paul=20 designed.    It is a two-holer designed to be installed = right=20 next to the engine ports (P-ported engine).   A single hole = would be=20 the best for an upstream design. 
 
FWIW, I don't get the whole rational for the = slide-throttle.  True,=20 it it theoretically the best performing solution but I live in the = real world=20 where the small theoretical advantage is outweighed by other = factors.
 
TJ, I forgot to comment on the FBW.   It is near (near = being a=20 relative term : )  production status but the hold modes are still = being=20 worked on and will not be finished before the RV-8 flys and it has = been flight=20 proven.  I don't sell flight critical stuff that I haven't risked = my own tender pink skin on first. 
 
Tracy (Last EC2 update out the door, departing for Colorado=20 Tuesday)
 
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