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 5.3.9) with ESMTP id 4498984 for flyrotary@lancaironline.net; Fri, 08 Oct 2010 18:31:48 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao107.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20101008223113.UYLU3990.fed1rmmtao107.cox.net@fed1rmimpo02.cox.net> for ; Fri, 8 Oct 2010 18:31:13 -0400 Received: from BigAl ([72.199.216.236]) by fed1rmimpo02.cox.net with bizsmtp id GNXC1f00l56cS2o04NXCVj; Fri, 08 Oct 2010 18:31:13 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=qP5kWAUm+muac02HiSlt5x9jWwhwI3kLQFqTb59u/Gk= c=1 sm=1 a=8S8fuD5XrasA:10 a=lN8H/RjlhkCyIsyuOn2r7w==:17 a=0UhgNgNH_2Wjjcb8NDAA:9 a=duy6OlYfuwVihZBWL9235ndpd3MA:4 a=CjuIK1q_8ugA:10 a=lrJXqn-QPm9yHmjmEJ0A:9 a=GuIhZRGOLP-b-ViAOVgA:7 a=mqyJyRuirrKcARKWsjBA0NWgnRsA:4 a=lN8H/RjlhkCyIsyuOn2r7w==:117 X-CM-Score: 0.00 Authentication-Results: cox.net; none From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Prop Chord vs RPM Date: Fri, 8 Oct 2010 15:32:04 -0800 Message-ID: <1BE2E27A5C954FFC9F6C6B024AE2FB2A@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01CB66FD.F5CE05F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6863 In-Reply-To: Importance: Normal Thread-Index: ActnK2QMMUzMKaNGS62UBZ+4k+anfAAFO2cg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01CB66FD.F5CE05F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable A prop is a wing that flies in a circle. Right? The most efficient=20 wings (the ones that put on gliders), are very long and thin to get a=20 high aspect ratio. Right? Given this premise, it only stands to reason = that the best prop would be the longest one that would leave some ground = clearance, and then absorbs any remaining Hp by increasing the chord. =20 That's my story, and I'm sticking to it (unless I'm wrong). =20 Nice try, Ernest; but the term 'gross over-simplification' comes to mind :-). With this wing; every increment is traveling at a different speed, = has a different AOA; and it's always making a sharp turn. Not to mention = various turbulence factors, material stress, etc; but then I know you knew all = that. =20 Al ------=_NextPart_000_000E_01CB66FD.F5CE05F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

A prop is a wing that flies in a circle.  Right?  The most = efficient

wings (the ones that put on gliders), are very long and thin to get a =

high aspect ratio.  Right?  Given this premise, it only stands to = reason

that the best prop would be the longest one that would leave some ground =

clearance, and then absorbs any remaining Hp by increasing the = chord.

 

That's my story, and I'm sticking to it (unless I'm wrong).

 

Nice try, = Ernest; but the term ‘gross over-simplification’ comes to mind = J.  With this wing; every increment is traveling at a different speed, has a different AOA; and it’s always making a sharp turn. Not to mention various turbulence factors, material stress, etc; but then I know you = knew all that.

 <= /font>

Al

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