Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3160591 for flyrotary@lancaironline.net; Sat, 10 Apr 2004 20:43:05 -0400 Received: from rad ([65.0.140.55]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040411004305.YRLZ1810.imf18aec.mail.bellsouth.net@rad> for ; Sat, 10 Apr 2004 20:43:05 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: long comments after 2 hours on rev-2 Date: Sat, 10 Apr 2004 19:43:01 -0500 Message-ID: <04aa01c41f5d$f46cb100$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04AB_01C41F34.0B96A900" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_04AB_01C41F34.0B96A900 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable When you measured the prop angle what proceedure did you use? =20 =20 The angle is measured at the tip, which is per Warp Drive's = instructions, using a protractor that they provide with the prop. You first use the = prop hub angle as a zero point, then measure the flat, rear side of the = blade. =20 =20 FWIW, on the Warp, this angle is not a good indication of the overall = pitch of the blade, so it really can't be compared with any other prop, or = used for any sort of calculation. For example, 13 degrees at the tip of a 68 inch prop comes out to 48 inches of pitch. When I enter my TAS and rpm numbers into a couple of prop programs, they agree that my 13 degree = setting is actually a 58 inch of effective pitch. 15 degrees seems to work out = to 63 inches of effective pitch. =20 =20 Sorry to hear about the continuing coil problems. =20 Rusty (I don't want to go) ------=_NextPart_000_04AB_01C41F34.0B96A900 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
When you measured = the prop=20 angle what proceedure did you use?
 
 
The = angle is measured=20 at the tip, which is per Warp Drive's instructions, using a = protractor that=20 they provide with the prop.  You first use the prop hub angle as a = zero=20 point, then measure the flat, rear side of the=20 blade.  
 
FWIW, on=20 the Warp, this angle is not a good indication of the overall pitch = of the=20 blade, so it really can't be compared with any other prop, or used for = any sort=20 of calculation.  For example, 13 degrees at the tip of a 68 inch = prop comes=20 out to 48 inches of pitch.  When I enter my TAS and rpm numbers = into a=20 couple of prop programs, they agree that my 13 degree setting is = actually a 58=20 inch of effective pitch.  15 degrees seems to work out to 63 inches = of=20 effective pitch. 
 
Sorry to hear = about the=20 continuing coil problems.
 
Rusty (I don't = want to=20 go)
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