Return-Path: Received: from fed1rmmtao02.cox.net ([68.230.241.37] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 374333 for flyrotary@lancaironline.net; Sun, 22 Aug 2004 15:04:35 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.37; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao02.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with SMTP id <20040822190405.CIWP17635.fed1rmmtao02.cox.net@davidandanne> for ; Sun, 22 Aug 2004 15:04:05 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Compressor maps Date: Sun, 22 Aug 2004 12:04:07 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004D_01C48840.20641190" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_004D_01C48840.20641190 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Oh yea, I intended to mention this as well, but Ed already covered it. Dave Leonard Hi Dave, However, I am a bit confused, I notice your have a 13B, yet you use 222CFM at 3000 rpm - which is about twice what you should be getting out of a 13B, I get about 153 CFM. Wait! 153*1.6 = 244 CFM, Ok I see where you are coming from. Now the crucial question is - does your engine produce enough exhaust mass flow to drive the T06H turbine wheel fast enough to produce 1.6 pressure ratio at sea level? If it does then 6000 rpm underload will likely produce much more than 1.6 pressure ratio. What I am saying is if you could get 1.6 at 3000 rpm then you would unquestionably need a waste gate to keep from blowing your engine at 6000 rpm under load. Ed Anderson ------=_NextPart_000_004D_01C48840.20641190 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Oh = yea, I intended=20 to mention this as well, but Ed already covered it.

Dave=20 Leonard

Hi Dave,

However, I am a bit confused, I = notice your have=20 a 13B, yet you use 222CFM at 3000 rpm - which is about twice what you = should=20 be getting out of a 13B, I get about 153 CFM. Wait! 153*1.6 =3D = 244 CFM,=20 Ok I see where you are coming from. Now the crucial question is=20 - does your engine produce enough exhaust mass flow to drive = the=20 T06H turbine wheel fast enough to produce 1.6 pressure ratio at sea=20 level? If it does then 6000 rpm underload will likely produce = much more=20 than 1.6 pressure ratio. What I am saying is if you could get = 1.6 at=20 3000 rpm then you would unquestionably need a waste gate to keep from = blowing=20 your engine at 6000 rpm under load.

<snip>

Ed=20 Anderson

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