X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.3.0) with ESMTP id 4067754 for flyrotary@lancaironline.net; Thu, 07 Jan 2010 01:18:41 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100107061806.TSLS16123.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Thu, 7 Jan 2010 01:18:06 -0500 Received: from BigAl ([72.192.128.205]) by fed1rmimpo01.cox.net with bizsmtp id SWJ51d00N4S1t5C03WJ57g; Thu, 07 Jan 2010 01:18:05 -0500 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=4cmh2gL1a6RJOvq2diO5/mV5P7W7DelkioqUudxRLMU= c=1 sm=1 a=Fd91bCVGJ9sA:10 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=JsJcKq2TsJkfg-_x830A:9 a=ArXHycvJIkaQ9I2yy29JcaI6xGkA:4 a=W8mIXCf0bxPr7I9UnfcA:9 a=rzd1hQnmuHSr9H981ccA:7 a=DFkps0t9Xax84bytFBrXmMplXKAA:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: first flight of the new year Date: Wed, 6 Jan 2010 22:19:18 -0800 Message-ID: <6BA6A893B491415E935CE907127BCA7A@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0012_01CA8F1E.49D66A60" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 Importance: Normal Thread-Index: AcqPRyr62lH5pWjZSMetulMOixj51gAFp9Qg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0012_01CA8F1E.49D66A60 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 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? =20 For it to run well very lean the mixtures to the rotors need to be = balanced - similar EGTs; so you may want to do whatever mode that is. You can = get 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't fell quite as smooth. You'll have to add some throttle to = maintain rpm. Max power is somewhere about 150+ rich of peak IIRC from the dyno = runs. =20 I typically cruise 5400-5500 rpm, 9.5 - 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 - not bad. Could get better economy = going slower, but unless I'm just sight-seeing, I wanna get there. =20 Does your test area extend to French Valley? Al =20 ------=_NextPart_000_0012_01CA8F1E.49D66A60 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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 balanced – similar EGTs; so you = may want to do whatever mode that is. You can get 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’t = fell quite as smooth. You’ll have to add some throttle to maintain rpm. = Max power is somewhere about 150+ rich of peak IIRC from the dyno = runs.

I typically cruise 5400-5500 rpm, = 9.5 – 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 – not bad. Could get better economy going slower, but unless = I’m just sight-seeing, I wanna get there.

Does your test area extend to = French Valley?

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