X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 09 Oct 2009 10:08:43 -0400 Message-ID: X-Original-Return-Path: Received: from betsy.gendns5.com ([65.254.38.234] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3879867 for lml@lancaironline.net; Thu, 08 Oct 2009 22:48:36 -0400 Received-SPF: none receiver=logan.com; client-ip=65.254.38.234; envelope-from=paul@tbm700.com Received: from s01060018f83ecf6d.cg.shawcable.net ([70.72.197.235]:53047 helo=[192.168.3.109]) by betsy.gendns5.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1Mw5WR-0002VB-0j for lml@lancaironline.net; Thu, 08 Oct 2009 22:47:59 -0400 From: paul miller Mime-Version: 1.0 (Apple Message framework v1076) Content-Type: multipart/alternative; boundary=Apple-Mail-13--276112561 Subject: Re: [LML] LOP MP setting for TSIO-550E X-Original-Date: Thu, 8 Oct 2009 20:47:57 -0600 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <1535678D-78F9-4A9B-ACB4-2AE548BE325C@tbm700.com> X-Mailer: Apple Mail (2.1076) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - betsy.gendns5.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com --Apple-Mail-13--276112561 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes I think the flaw in that argument is the GPH per HP for a specific regime (ROP versus LOP) as your specific fuel consumption will change depending on that setting. Your HP should be directly proportional to RPM and MP at any mixture. I think I'm correct in that last statement regardless of whether the engine is ROP or LOP. When I ran the TSIO-520NB with GAMI the procedure would be to bump up the MP to keep the desired HP (65%, 70% or whatever you choose). You have to bring the MP back up as the fuel flow drops off. So, I would pick your desired power setting for LOP ops (say 65% for talking purposes) and get the MP and RPM for that power setting. When you go LOP work towards bringing the MP back up to maintain your target power. That is what I recall for the GAMIs so I would be interested if that might be what was being taught more recently. As I said in an earlier posting, the only problem with high altitude turbo ops LOP was the need to bump up the MP to keep the wastegate from bootstrapping. Others may need higher MP for pressurization but I never experienced that in the twin. Hope that all makes sense. Paul Miller Calgary (Legacy) On 2009-10-08, at 6:13 PM, Isaac Heizer wrote: > My ES-P has a TSIO-550E with GAMI injectors, and i've recently been > through advancedpilot's web LOP course. But I'm still unclear on at > least one point. > > My TSIO-550E will happily run at 17.5 GPH at a MP of any of 30, 31, > 32 (among others). All cylinders remain below 380, and TIT is > reasonable. > > My understanding is multiplying 14.7 x GPH yields HP, in this case > 73.5% power > > Is it 73% power no matter how I set the MP, so long as temperatures > remain in control? If that's true, why would I select one MP over > another (realizing I can't run wide open throttle)? --Apple-Mail-13--276112561 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii I = think the flaw in that argument is the GPH per HP for a specific regime = (ROP versus LOP) as your specific fuel consumption will change depending = on that setting.  Your HP should be directly proportional to RPM = and MP at any mixture. I think I'm correct in that last statement = regardless of whether the engine is ROP or LOP.  When I ran the = TSIO-520NB with GAMI the procedure would be to bump up the MP to keep = the desired HP (65%, 70% or whatever you choose).   You have to = bring the MP back up as the fuel flow drops off.    So, I = would pick your desired power setting for LOP ops (say 65% for talking = purposes) and get the MP and RPM for that power setting.   When you = go LOP work towards bringing the MP back up to maintain your target = power.  That is what I recall for the GAMIs so I would be = interested if that might be what was being taught more recently. =  As I said in an earlier posting, the only problem with high = altitude turbo ops LOP was the need to bump up the MP to keep the = wastegate from bootstrapping.  Others may need higher MP for = pressurization but I never experienced that in the twin.  Hope that = all makes sense.  

Paul Miller
Calgary = (Legacy) 
On 2009-10-08, at 6:13 PM, Isaac Heizer = wrote:

My ES-P has a TSIO-550E = with GAMI injectors, and i've recently been through advancedpilot's web = LOP course.  But I'm still unclear on at least one point.

My = TSIO-550E will happily run at 17.5 GPH at a MP of any of 30, 31, 32 = (among others).  All cylinders remain below 380, and TIT is = reasonable.

My understanding is multiplying 14.7 x GPH yields HP, = in this case 73.5% power

Is it 73% power no matter how I set the = MP, so long as temperatures remain in control?  If that's true, why = would I select one MP over another (realizing I can't run wide open = throttle)?

= --Apple-Mail-13--276112561--