Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 335631 for flyrotary@lancaironline.net; Tue, 27 Jul 2004 09:31:18 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.34; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao05.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with ESMTP id <20040727133048.YTB25208.fed1rmmtao05.cox.net@BigAl> for ; Tue, 27 Jul 2004 09:30:48 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Prop Speeds Date: Tue, 27 Jul 2004 06:30:50 -0700 Message-ID: <002101c473dd$ef398f30$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0022_01C473A3.42DAB730" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C473A3.42DAB730 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Subject: [FlyRotary] Prop Speeds =20 Wow, that is 2935 RPM at the prop with a prop tip speed of just under = 900 FPS. I am still too shy to run mine that fast, although I could easily = get there. Interestingly, the calculations say the max corkscrew speed of = that prop at that RPM is only 197mph. He could pick up a little for being = really clean, and maybe some more depending on how they calculate prop pitch. =20 The pitch is a measure of the angle of the chord of the blade; or = sometimes the flat on the RAF airfoil; it doesn't measure the "lift" of the = airfoil. So it seems to me quite possible to go faster than the "corkscrew" speed = of the prop. But then I could be wrong . . . =20 Al ------=_NextPart_000_0022_01C473A3.42DAB730 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

 

Subject: [FlyRotary] Prop Speeds

 

Wow, that is 2935 RPM at = the prop with a prop tip speed of just under 900 FPS.  I am still too shy to = run mine that fast, although I could easily get there.  Interestingly, = the calculations say the max corkscrew speed of that prop at that RPM is = only 197mph.  He could pick up a little for being really clean, and maybe some more = depending on how they calculate prop pitch.

 

The pitch is a measure of the = angle of the chord of the blade; or sometimes the flat on the RAF airfoil; it = doesn’t measure the “lift” of the airfoil.  So it seems to me = quite possible to go faster than the “corkscrew” speed of the = prop.  But then I could be wrong . . .

 

Al

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