X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.3.3) with ESMTP id 4155850 for flyrotary@lancaironline.net; Mon, 08 Mar 2010 01:25:16 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao103.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100308062440.RIWR19579.fed1rmmtao103.cox.net@fed1rmimpo02.cox.net> for ; Mon, 8 Mar 2010 01:24:40 -0500 Received: from BigAl ([72.192.128.205]) by fed1rmimpo02.cox.net with bizsmtp id qWQg1d00V4S1t5C04WQgMZ; Mon, 08 Mar 2010 01:24:40 -0500 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=KqzZVGv1/pIBe+XbL3gCBfL8vaFXECOST7Bs1vfp5Gs= c=1 sm=1 a=MpA_2FKtsbgA:10 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=YDUn3Y12of8QlrxH4lMA:9 a=UmqpersiRPNUNvZrKYcXTIgLn7EA:4 a=CjuIK1q_8ugA:10 a=nYaw3YxWDP3QjA7HtoQA:9 a=LuUCofOzAnCr4ISeyl0A:7 a=cofq0bGUyM0aLdGsYKsuf8oMB6EA:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Performance 68x72 prop. [FlyRotary] Re: TB size, Travel and Power Date: Sun, 7 Mar 2010 22:25:00 -0800 Message-ID: <1849511A666941CB94EF74570DD55C75@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01CABE45.06AA85E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 Importance: Normal Thread-Index: Acq+dpnYLGlhnXmsQiSx7X578KsVpQAEGxFQ In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CABE45.06AA85E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thanks. As I've mentioned before my static RPM is in the same ballpark (5300) but in level flight only comes up to a max of around 5700 - 5800. So if I could bolt your prop on and get up to 6400, that would be a pretty dramatic change. The small delta between static and level flight RPM is another reason I suspect something weird going on in the engine limiting power. Mike Mike; That doesn't really seem out of line to me. IIRC; when I had the 85 pitch prop the static and max level were quite similar to what you're getting - maybe just a bit higher. I think a bit less prop will get you close to where you want to be. I don't know what the tradeoffs are between less pitch or shorter blade; but I'm thinking less pitch is the way to go. Of course some more power would do the job as well. Al ------=_NextPart_000_0000_01CABE45.06AA85E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Thanks. As I've mentioned = before my static RPM is in the = same ballpark (5300) but = in level flight only comes up to a max of around 5700 - 5800. So if I could bolt = your prop on and get up to 6400, that would be a pretty dramatic change. The = small delta between static and level flight RPM is another reason I suspect something = weird going on in the engine limiting power.

Mike

 

Mike;

 

That doesn’t really seem = out of line to me.  IIRC; when I had the 85 pitch prop the static and max = level were quite similar to what you’re getting – maybe just a bit = higher.  I think a bit less prop will get you close to where you want to = be.  I don’t know what the tradeoffs are between less pitch or shorter blade; but = I’m thinking less pitch is the way to go.

 

Of course some more power would = do the job as well.

 

Al

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