X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-pw0-f48.google.com ([209.85.160.48] verified) by logan.com (CommuniGate Pro SMTP 5.3.0) with ESMTP id 4068201 for flyrotary@lancaironline.net; Thu, 07 Jan 2010 12:08:29 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.48; envelope-from=wdleonard@gmail.com Received: by pwj14 with SMTP id 14so4391802pwj.27 for ; Thu, 07 Jan 2010 09:07:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=oxS3QCIdRe83BnVlHqlKvhr2L5ByBmGkCYpnMIT/dfA=; b=J1ZwqbsqVyMtHw77jE/hzMjmD1ZBfZ5G5Jh8dBGyuySvmE78O+LrOkzpCVny/lg6Wf N7KugxmlBJHMR3ft/iSDFq6sAk6Ft3ez8mrPE00O3aEs0FtStYgE5FxgybsUrMg7WsNC jgBZatinR733HAIpZW6cjQCpBN9phB4VUUuHc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=d3P3qsVh0szvsDsjS21aUWyPA8MCKvprlUknVIa2HclopeQFrGa3GdDiqDKmgESQL3 4j2B2o+2vAeaeFKyCtD+uOX5PubsZ739AR5BBYagZvWvSovrI344co+9ub+QvaWV6jas blhkKs4R5cOMKvfPoha2zoFbCEEWjKb6XIO48= MIME-Version: 1.0 Received: by 10.143.26.38 with SMTP id d38mr12633220wfj.0.1262884072943; Thu, 07 Jan 2010 09:07:52 -0800 (PST) In-Reply-To: References: Date: Thu, 7 Jan 2010 09:07:52 -0800 Message-ID: <1c23473f1001070907n5e4944bcg1d0f68e3c132d459@mail.gmail.com> Subject: Re: [FlyRotary] Re: first flight of the new year From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001636e0ad738f7126047c961c27 --001636e0ad738f7126047c961c27 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Again, my experience is very similar to Al's. I cruse between 6k' and 17k' depending on the winds. That gives quite a range of variables. Interestingly though, regardless of altitude and RPM etc, about 8 gph seems to hit the narrow sweet spot with my EGT's (actually TOT) below 900C (about 1600F) and yet the engine not running too rough (giving me about 155KTAS). Yes, the RPM decreases quite noticeably when going to the lean side of peak and the engine is not as smooth (I have grown used to it, but I think Al really notices when he flies in my plane). In order to help my turbo last longer, I avoid peak EGT pretty religiously (that seems to be working so far, over 200 hrs on current turbo). At the lean setting, the O2 sensor of= f the lean end of the scale. Because of my turbo Manifold, I am unable to install individual EGT sensors for each rotor, so my rotors are still slightly unbalanced (probably most o= f the problem with roughness). Besides, even if you were able to get them perfectly balanced at one RPM, it would change slightly at a different RPM/power setting. Without the turbo, you should be able to safely run closer to peak EGT or best power without risk of damaging anything. --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net On Wed, Jan 6, 2010 at 10:19 PM, Al Gietzen wrote: > > > For cruise do you lean enough that you notice any reduction in engine RPM= ? > What sort of fuel flows, manifold pressure, and cruise speeds are you > getting and at what altitude? > > > > For it to run well very lean the mixtures to the rotors need to be balanc= ed > =96 similar EGTs; so you may want to do whatever mode that is. You can g= et a > handle on good lean cruise and max power by watching the EGT. I tend to = run > about 100 lean of peak for cruise. Although it will do fine leaner, it > doesn=92t fell quite as smooth. You=92ll have to add some throttle to mai= ntain > rpm. Max power is somewhere about 150+ rich of peak IIRC from the dyno ru= ns. > > > > I typically cruise 5400-5500 rpm, 9.5 =96 10.5 Kft, maybe 9.7 gph on my > 3-rotor; so you should get the 2-rotor in the area of 6.5. That gives me > 165+ KTAS in my 4-place Velocity =96 not bad. Could get better economy > going slower, but unless I=92m just sight-seeing, I wanna get there. > > > > Does your test area extend to French Valley? > > Al > > > --001636e0ad738f7126047c961c27 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
Again, my experience is very similar to Al's.=A0 I cruse between 6= k' and 17k' depending on the winds.=A0 That gives quite a range of = variables.=A0 Interestingly though, regardless of altitude and RPM etc,=A0a= bout 8 gph seems to=A0hit the narrow sweet spot with=A0my EGT's (actual= ly TOT)=A0below 900C (about 1600F)=A0and yet the engine not running too rou= gh (giving me about 155KTAS).=A0 Yes, the RPM decreases quite noticeably wh= en going to the lean side of peak and the engine is not as smooth (I have g= rown used to it, but I think=A0Al really notices when he flies in my plane)= .=A0 In order to help my turbo last longer, I avoid peak EGT pretty religio= usly (that seems to be working so far, over 200 hrs on current turbo).=A0 A= t the lean setting, the O2 sensor off the lean end of the scale.
=A0
Because of my turbo Manifold, I am unable to install individual EGT se= nsors for each rotor, so my rotors are still slightly unbalanced (probably = most of the problem with roughness).=A0 Besides, even if you were able to g= et them perfectly balanced at one RPM, it would change slightly at a differ= ent RPM/power setting.=A0
=A0
Without the turbo, you should be able to safely run closer to peak EGT= or best power without risk of damaging anything.
=A0
--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net


On Wed, Jan 6, 2010 at 10:19 PM, Al Gietzen <ALVentures@cox.net<= /a>> wrote:

=A0

For cruise= do you lean enough that you notice any reduction in engine RPM? What sort = of fuel flows, manifold pressure, and cruise speeds are you getting and at = what altitude?

=A0<= /font>

For it to r= un well very lean the mixtures to the rotors need to be balanced =96 simila= r EGTs; so you may want to do whatever mode that is.=A0 You can get a handl= e on good lean cruise and max power by watching the EGT.=A0 I tend to run a= bout 100 lean of peak for cruise. =A0Although it will do fine leaner, it do= esn=92t fell quite as smooth. You=92ll have to add some throttle to maintai= n rpm. Max power is somewhere about 150+ rich of peak IIRC from the dyno ru= ns.

=A0<= /font>

I typically= cruise 5400-5500 rpm, 9.5 =96 10.5 Kft, maybe 9.7 gph on my 3-rotor; so yo= u should get the 2-rotor in the area of 6.5. That gives me 165+ KTAS in my = 4-place Velocity =96 = not bad.=A0 Could get better economy going slower, but unless I=92m just si= ght-seeing, I wanna get there.

=A0<= /font>

Does your t= est area extend to French Valley?

Al

=A0<= /font>




--001636e0ad738f7126047c961c27--