Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP id 404718 for flyrotary@lancaironline.net; Thu, 09 Sep 2004 20:15:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20040910001429.XZYB19186.imf17aec.mail.bellsouth.net@rd> for ; Thu, 9 Sep 2004 20:14:29 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] First engine run with Monster Prop Date: Thu, 9 Sep 2004 19:14:45 -0500 Message-ID: <000a01c496cb$2d271500$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000B_01C496A1.44510D00" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_000B_01C496A1.44510D00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ok, got out today and fired up the engine with the new prop and gear = box. This is the 76x88 inch prop that is 2" longer than the one Tracy and = Rusty have on their birds. The static was 5400 rpm at 28.75" with ambient manifold pressure reading 29.75" (as best I interpolated). OAT was 87F. Idle was considerably smoother whether due to increased mass of larger = prop, new gear box or both. I did notice the 2.85 has considerably less gear = lash than the 2.17. =20 Hi Ed, =20 Glad you got it running, and thanks for the numbers. It still bugs me = that I'm only getting 27" MAP, but I'm convinced it's a bum reading. Hard to = say how much the extra 2" of prop will effect the rpm, but that sounds a = little lower than I was expecting to hear. As you my recall, I went from 5250 = with the B drive, to 5500 with the C. However, now that I've re-worked the restrictive inlet, I'm at 6000 rpm. I bet you still have some tweaking = to do, but that's half the fun right :-) =20 So ya got some P factor eh? Try it without the training wheel, in a = 3pt stance :-) Still running the left offset in the mount? =20 =20 Rusty (not looking like I'll get to fly the -3 this weekend, due to lack = of oil pressure fitting) ------=_NextPart_000_000B_01C496A1.44510D00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Ok, got out today and = fired up the=20 engine with the new prop and gear box.  This is the 76x88 inch prop = that is=20 2" longer than the one Tracy and Rusty have on their birds.  The = static was=20 5400 rpm at 28.75" with ambient manifold pressure reading 29.75" (as = best I=20 interpolated). OAT was 87F.  Idle was considerably smoother = whether=20 due to increased mass of larger prop, new gear box or both.  I did = notice=20 the 2.85 has considerably less gear lash than the 2.17.
 
 Hi=20 Ed,
 
Glad you got=20 it running, and thanks for the numbers.  It still bugs me that I'm = only=20 getting 27" MAP, but I'm convinced it's a bum reading.  Hard to say = how=20 much the extra 2" of prop will effect the rpm, but that sounds a little = lower=20 than I was expecting to hear.  As you my recall, I went = from 5250=20 with the B drive, to 5500 with the C.  However, now that I've = re-worked the=20 restrictive inlet, I'm at 6000 rpm.  I bet you still have some = tweaking to do, but that's half the fun right :-)
 
So ya got=20 some P factor eh?   Try it without the training wheel, in = a 3pt stance :-)   Still running the left offset in the=20 mount?   
 
Rusty (not=20 looking like I'll get to fly the -3 this weekend, due to lack of oil = pressure=20 fitting)
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