Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 372450 for flyrotary@lancaironline.net; Fri, 20 Aug 2004 11:34:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.69; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040820153343.OVHU1792.imf21aec.mail.bellsouth.net@rd> for ; Fri, 20 Aug 2004 11:33:43 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EM-2 MAP readings Date: Fri, 20 Aug 2004 10:33:56 -0500 Message-ID: <000001c486cb$1c7f62d0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C486A1.33A95AD0" 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 V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C486A1.33A95AD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable There is likely some loss in the long TB barrel- I think it is about 4 = =BD=94 long. My barrels are 44 mm dia. What are yours? I had measured them to be about 1-5/8, which is probably 42 mm. Each = barrel feeds a single runner that's also 1-5/8" ID. That runner later splits = into two to feed the two ports of the rotor. I could put a small plenum = between the TB, and the runners, to allow each runner to pull from both barrels, = but I can't see how that will do much for me. =20 You can see my plot of MAP vs RPM at http://members.cox.net/alg3/Dynamometer%20test%20report.htm and scroll to near the bottom. It went all the way down to 25=94 at = 7000 rpm. I=92d be interested in what TWM has to say. Thanks for the link Al. I've tested this with nothing ahead of the TB, = so I can't blame it on any upstream restriction. I looked back at some old numbers, which were with a larger 44 mm TWM TB, and I was only getting = 27 inches or so MAP at WOT and low altitude. That makes me think, even = more, that the low MAP numbers are a result of the port placement of the TB. = I doubt I'll be able to call TWM today, and I further doubt they'll be = willing to admit to any problem if there is any, but I'll let you know what they say. =20 =20 Rusty (off to Panama City)=20 ------=_NextPart_000_0001_01C486A1.33A95AD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

There is likely some loss in the long TB barrel- I = think it is=20 about 4 =BD” long.  My barrels are 44 mm dia.  What are=20 yours?

I had measured them to be about = 1-5/8, which=20 is probably 42 mm.  Each barrel feeds a single runner = that's also=20 1-5/8" ID.  That runner later splits into two to feed the two ports = of the=20 rotor.   I could put a small plenum between the TB, and the = runners,=20 to allow each runner to pull from both barrels, but I can't see how that = will do much for me. 

  You can see my plot of MAP vs RPM at http= ://members.cox.net/alg3/Dynamometer%20test%20report.htm
and=20 scroll to near the bottom.  It went all the way down to 25” = at 7000=20 rpm.  I’d be interested in what TWM has to say.

Thanks = for the link=20 Al.  I've tested this with nothing ahead of the TB, so I can't = blame it on=20 any upstream restriction.  I looked back at some old numbers, which = were=20 with a larger 44 mm TWM TB, and I was only getting 27 inches or so MAP = at WOT=20 and low altitude.  That makes me think, even more, that the low MAP = numbers=20 are a result of the port placement of the TB.  I doubt I'll be able = to call=20 TWM today, and I further doubt they'll be willing to admit to any = problem=20 if there is any, but I'll let you know what they say. =20
 
Rusty (off to Panama=20 City) 
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