X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=BpPjPrf5 c=1 sm=1 tr=0 a=KbJ6z+DYTCCro+wkaALDFg==:117 a=xycr6CVXJRVtFs4WRGOeRA==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=IkcTkHD0fZMA:10 a=Jdjhy38mL1oA:10 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=DtZ0pdavaJVmuMNFNgAA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "Marc Wiese cardmarc@charter.net" Received: from [47.43.20.32] (HELO impout008.msg.chrl.nc.charter.net) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 13373639 for flyrotary@lancaironline.net; Tue, 07 Jan 2020 17:12:00 -0500 Received-SPF: pass receiver=logan.com; client-ip=47.43.20.32; envelope-from=cardmarc@charter.net Received: from HomeDesktop ([97.94.202.172]) by cmsmtp with ESMTP id ox4hi6xTycx2eox4hiVZb2; Tue, 07 Jan 2020 22:11:44 +0000 Authentication-Results: charter.net; none X-Authority-Analysis: v=2.3 cv=efOJgIMH c=1 sm=1 tr=0 a=xycr6CVXJRVtFs4WRGOeRA==:117 a=xycr6CVXJRVtFs4WRGOeRA==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=IkcTkHD0fZMA:10 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=DtZ0pdavaJVmuMNFNgAA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Inlet radius ratio Date: Tue, 7 Jan 2020 16:11:43 -0600 Message-ID: <007801d5c5a7$7223b250$566b16f0$@charter.net> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJHxVApRhpR6sWi5mt+pqX0H5KZJqb7xBlg Content-Language: en-us X-CMAE-Envelope: MS4wfF3nJ+pEZ2gOkunLbaMOG4UeR329x1lip4AVYQTmi8EJkzauXHQe5ApZdpMdgSccEWtCqtKpdngL67STRtDcSnT3VwpPt5m68rtmB1tYNg8eOiV5n/Em lryDN4lFJXmuiyZhxgjywPXsiSVYvCjzGH1PHiiX2/a1SPH0eeq/XpKbxmAUHBgvd7STvwbbLlInWQ== Can someone sketch this out, I'm having difficulty following where these = curves are supposed to be? Marc -----Original Message----- From: Rotary motors in aircraft=20 Sent: Tuesday, January 07, 2020 10:57 AM To: Rotary motors in aircraft Subject: [FlyRotary] Inlet radius ratio Tracy reported a marked increase in cooling when changing the = inner/outer radius of the duct inlet. The outer radius of the lip should = apparently be greater than the inner radius of the lip. He got the = optimum ratio from an NACA paper, but don't remember which. I think the goal is maximum pressure recovery at low speeds (100 mph) = and high angle of attack and of course minimum drag at low and high = speeds (output cowl flap to lessen flow at high speeds making the air = flow easily around the inlet and cowl at higher speeds). I've been trying to locate that paper but keep finding papers on turbine = inlets and supersonic inlets. Does anyone know what that NACA paper may be? Or even just the optimum = radius ratio? Finn -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html