X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.3.3) with ESMTP id 4156907 for flyrotary@lancaironline.net; Mon, 08 Mar 2010 22:30:56 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao107.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100309033020.GCEM20722.fed1rmmtao107.cox.net@fed1rmimpo03.cox.net> for ; Mon, 8 Mar 2010 22:30:20 -0500 Received: from willsPC ([68.105.86.80]) by fed1rmimpo03.cox.net with bizsmtp id qrWL1d0071k005Q04rWLAo; Mon, 08 Mar 2010 22:30:20 -0500 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=2jNAe8bl7dKZqluhAH3XPKMU4gZlZJN30MLCqgTVbhI= c=1 sm=1 a=MpA_2FKtsbgA:10 a=XruvlouZCDbGUgEaRUiNZQ==:17 a=jRUFnnHZDIOxjxAV2wUA:9 a=qwVyUSBCrjtYkoBk_jHM6QKjF8kA:4 a=wPNLvfGTeEIA:10 a=kviXuzpPAAAA:8 a=Ia-xEzejAAAA:8 a=Ik4MH5WJdmzzEITQWUIA:9 a=kXitE-u3C52FE9RNJKEA:7 a=8ZPmtD6ixIQPL5junwL3O_7stSAA:4 a=4vB-4DCPJfMA:10 a=EzXvWhQp4_cA:10 a=XruvlouZCDbGUgEaRUiNZQ==:117 X-CM-Score: 0.00 Message-ID: From: "Mike Wills" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Performance 68x72 prop. [FlyRotary] Re: TB size, Travel and Power Date: Mon, 8 Mar 2010 19:30:18 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01CABEF5.C8F6C180" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 This is a multi-part message in MIME format. ------=_NextPart_000_0007_01CABEF5.C8F6C180 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks for the input Al. The small delta seems to be abnormal compared = to the experiences of most others so good to know I'm not the only one. = Since Ed's old prop has less pitch than my current, seems like that = would be a good test. Still planning on some intake mods, mostly to get = enough room to fit a proper air cleaner. So I'm going to focus on that = first. Mike From: Al Gietzen=20 Sent: Sunday, March 07, 2010 10:25 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Performance 68x72 prop. [FlyRotary] Re: TB = size, Travel and Power 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_0007_01CABEF5.C8F6C180 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks for the input Al. The small delta seems = to be=20 abnormal compared to the experiences of most others so good to know I'm = not the=20 only one. Since Ed's old prop has less pitch than my current, seems = like=20 that would be a good test. Still planning on some intake mods, mostly to = get=20 enough room to fit a proper air cleaner. So I'm going to focus on that=20 first.
 
Mike

From: Al Gietzen
Sent: Sunday, March 07, 2010 10:25 PM
Subject: [FlyRotary] Re: Performance 68x72 prop. [FlyRotary] = Re: TB=20 size, Travel and Power

 

Thanks. As I've = mentioned before=20 my static RPM is in the same ballpark (5300) but in level flight = only comes up=20 to a max of around 5700 - 5800. So if I could bolt your prop on and get = up to=20 6400, that would be a pretty dramatic change. The small delta between = static and=20 level flight RPM is another reason I suspect something = weird going=20 on in the engine limiting power.

Mike

 

Mike;

 

That = doesn=92t really=20 seem out of line to me.  IIRC; when I had the 85 pitch prop the = static and=20 max level were quite similar to what you=92re getting =96 maybe just a = bit=20 higher.  I think a bit less prop will get you close to where you = want to=20 be.  I don=92t know what the tradeoffs are between less pitch or = shorter=20 blade; but I=92m thinking less pitch is the way to go.

 

Of course = some more=20 power would do the job as well.

 

Al

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