X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 18 Apr 2006 12:26:44 -0400 Message-ID: X-Original-Return-Path: Received: from smtpauth07.mail.atl.earthlink.net ([209.86.89.67] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1071690 for lml@lancaironline.net; Tue, 18 Apr 2006 01:16:02 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.67; envelope-from=rtitsworth@mindspring.com DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=mindspring.com; b=HM8ub0vJNf8XyO09rIHC0iC2TJccCSUrb7Z5Gb0Qc0QLxG9oUyfrab1WusOsgddN; h=Received:Reply-To:From:To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:X-MimeOLE:Thread-Index:In-Reply-To:Message-ID:X-ELNK-Trace:X-Originating-IP; Received: from [68.40.94.44] (helo=RDTVAIO) by smtpauth07.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1FViYW-0002lh-DD for lml@lancaironline.net; Tue, 18 Apr 2006 01:15:16 -0400 Reply-To: From: "richard titsworth" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: TSIO-550 Turbo setup for non-pressurizedLlancairs - Pictures X-Original-Date: Tue, 18 Apr 2006 01:14:58 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook, Build 11.0.5510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 Thread-Index: AcZikX8rhi52gXB1R86gXnXf4PS0tgAEy44w In-Reply-To: X-Original-Message-ID: X-ELNK-Trace: b17f11247b2ac8f0a79dc4b33984cbaa0a9da525759e265448812a653c240e1576d35bf8be327bb2c839d1b4ccd7d4ce350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 68.40.94.44 George, Thanks for your interest in my post/questions. I was told the standard TSIO-550E turbos (A/R=0.5) were "sized" assuming the bleed air sonic nozzles are in place. Without them, the tubro surges and runs the risk of a momentary overboost and/or compressor stall (personally unverified). My understanding is that the job of the pressure controller and waste gate is to prevent that. However, perhaps the dynamic response is inadequate and/or turbine rotational inertia too great and... overboost. Seems that several folks have swapped the std turbos for some with a "looser"/larger turbine throat (A/R = 1.0 or 2.0), which would decrease the turbo responsiveness, and have thus been successful in plugging the bleed air nozzles (which are otherwise an efficiency loss if left open in an un-pressurized aircraft). I'm trying to gather info to separate OWT from actual experiences. If it seems to work, I'll do the same on my un-pressurized Lancair ES (TSIO-550), currently under construction. Any/all insights are welcome (especially from you!) Rick Titsworth rtitsworth@mindsoring.com 313-506-5604 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Marvin Kaye Sent: Monday, April 17, 2006 10:41 PM To: Lancair Mailing List Subject: [LML] Re: TSIO-550 Turbo setup for non-pressurizedLlancairs - Pictures Posted for "George Braly" : Richard, Why do you think that the plugged sonic nozzles are "ill-advised" ? George Braly -- For archives and unsub http://mail.lancaironline.net/lists/lml/