Return-Path: Received: from [65.54.169.61] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 777704 for flyrotary@lancaironline.net; Thu, 10 Mar 2005 00:16:08 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.61; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 9 Mar 2005 21:15:22 -0800 Message-ID: Received: from 4.174.7.101 by BAY3-DAV31.phx.gbl with DAV; Thu, 10 Mar 2005 05:15:22 +0000 X-Originating-IP: [4.174.7.101] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Mixture Settings Date: Thu, 10 Mar 2005 00:15:22 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0092_01C52506.400A3750" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Thu, 10 Mar 2005 00:15:22 -0500 X-OriginalArrivalTime: 10 Mar 2005 05:15:22.0943 (UTC) FILETIME=[292D74F0:01C52530] This is a multi-part message in MIME format. ------=_NextPart_000_0092_01C52506.400A3750 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Rusty is right (especially about the cheap bastard part). I run lean of = peak even for takeoff unless I have a short runway with obstacles to = clear. So far, I even race LOP. I was 3 GPH lean of best power setting = during last year's Sun 100. On those rare occasions when I use it, I don't rely on a mixture monitor = or EGTs for maximum power setting. If you have ever run a model = airplane engine you are familiar with what I do. I twist the EC2 = mixture control and listen for maximum rev point. Nothing is more = accurate, faster (or easier). Tracy (EM2 fuel flow calibrated in $ per hour) Hi Rusty, OK, here is the question that still seems to have an ambiguous answer. For HIGH POWER settings, should I run rich of peak, and if so, how = much? This would be for takeoff and climb. Bill's previous response seemed = to imply that running at stoichiometric mixture would maximize power. (I'm assuming stoichiometric would be peak EGT.) You are saying I should be a little richer I believe. I'm not concerned with the economy setting, just the maximum performance settings. I think the piston engines will detonate if the mixture is too lean, especially at high power settings. Sorry for belaboring the point, but I really want to know. :) Where do you actual rotary fliers set your EGT for TO? Thanks, Bob W. (rotary wanabe, Corona in the fridge) On Wed, 9 Mar 2005 21:30:32 -0600 "Russell Duffy" <13brv3@bellsouth.net> = wrote: > So my belief that I need to run richer for the high power settings = on the > rotary is incorrect?=20 >=20 > =20 > Hi Bob, > =20 > With all engines, it it true that best power is richer than 14.7 = AFR. Best > economy is leaner. Tracy tends to be... how shall I put this, "a = cheap > bastard" when it comes to cruise settings :-) Rest assured, he = ain't > running best power unless he's racing, and probably not even then. =20 > =20 > Cheers, > Rusty (fearing the wrath of the cheap bastard, especially after Ed = drinks > all his beer) >=20 --=20 http://www.bob-white.com N93BD - Rotary Powered BD-4 (real soon) >> Homepage: http://www.flyrotary.com/ >> Archive: = http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0092_01C52506.400A3750 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Rusty is right (especially about the cheap bastard part). I = run lean=20 of peak even for takeoff unless I have a short runway with obstacles to=20 clear. So far, I even race LOP. I was 3 GPH lean of best = power=20 setting during last year's Sun 100.

On those rare occasions when I use it, I don't rely on a = mixture=20 monitor or EGTs for maximum power setting. If you have ever run a = model=20 airplane engine you are familiar with what I do. I twist the EC2 = mixture=20 control and listen for maximum rev point. Nothing is more = accurate,=20 faster (or easier).

Tracy (EM2 fuel flow calibrated in $ per hour)

Hi Rusty,

OK, here is the question that = still seems=20 to have an ambiguous answer.
For HIGH POWER settings, should I run = rich of=20 peak, and if so, how much?
This would be for takeoff and = climb. =20 Bill's previous response seemed to
imply that running at = stoichiometric=20 mixture would maximize power.
(I'm assuming stoichiometric would be = peak=20 EGT.) You are saying I
should be a little richer I = believe. I'm=20 not concerned with the
economy setting, just the maximum = performance=20 settings. I think the
piston engines will detonate if the = mixture is=20 too lean, especially at
high power settings.

Sorry for = belaboring=20 the point, but I really want to know. :) Where
do you = actual=20 rotary fliers set your EGT for TO?

Thanks,
Bob W. (rotary = wanabe,=20 Corona in the fridge)

On Wed, 9 Mar 2005 21:30:32=20 -0600
"Russell Duffy" <13brv3@bellsouth.net>=20 wrote:

> So my belief that I need to run richer for the high = power=20 settings on the
> rotary is incorrect?
>
> =
>=20 Hi Bob,
>
> With all engines, it it true that best = power is=20 richer than 14.7 AFR. Best
> economy is leaner. = Tracy tends=20 to be... how shall I put this, "a cheap
> bastard" when it comes = to=20 cruise settings :-) Rest assured, he ain't
> running = best=20 power unless he's racing, and probably not even then. =
> =20
> Cheers,
> Rusty (fearing the wrath of the cheap = bastard,=20 especially after Ed drinks
> all his beer)
> =

--
http://www.bob-white.com
N93BD = - Rotary=20 Powered BD-4 (real soon)

>> Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive: http://lancai= ronline.net/lists/flyrotary/List.html

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