X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 25 May 2006 20:31:00 -0400 Message-ID: X-Original-Return-Path: Received: from [65.54.169.75] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1128072 for lml@lancaironline.net; Thu, 25 May 2006 17:30:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.75; envelope-from=mvr7@hotmail.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 25 May 2006 14:30:13 -0700 X-Original-Message-ID: Received: from 166.172.149.136 by BAY114-DAV3.phx.gbl with DAV; Thu, 25 May 2006 21:30:11 +0000 X-Originating-IP: [166.172.149.136] X-Originating-Email: [mvr7@hotmail.com] X-Sender: mvr7@hotmail.com Reply-To: "Maurits" From: "Maurits" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: turbines over temps & rpm X-Original-Date: Thu, 25 May 2006 14:30:00 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004D_01C68007.B4562A30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 X-OriginalArrivalTime: 25 May 2006 21:30:13.0598 (UTC) FILETIME=[687EDFE0:01C68042] This is a multi-part message in MIME format. ------=_NextPart_000_004D_01C68007.B4562A30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Barney, We have changed the software so it would not count the occasional spike = caused by the tachgen as an event during the initial testing development = of the TSLM and with the over 40 planes flying with the TSLM have not = had any complaints. We have downloads showing Lancairs with significant over temps , N2 in = excess of 2080 rpm by as much as 300 plus rpm and over torque during = test flights for a couple of seconds at a time and usually the over temp = , over speed and over torque happens simultaneously. According to our = customers these over temps are done by various pilots including Lancair = test pilots. Diemech Turbines has this data recorded on file, in most = cases Diemech Turbines found it necessary to open up engines to repair = the damage. It is also important to note that with regards to using the 84 inch prop = especially over speeding the N2 on landing on a short strip at high = elevation with a Lancair IV T that you have Beta Limiting activated in = the configuration and wired up, as you can easily exceed 1900 RPM ( = Walter Manual ) in Beta / Reverse during landing. It has been demonstrated on a plane with a 99 inch prop as well. Regards, Maurits ----- Original Message -----=20 From: Barney Briton=20 To: Lancair Mailing List=20 Sent: Wednesday, May 24, 2006 4:43 PM Subject: [LML] Re: turbines over temps & rpm=20 Bill I have not heard of any test pilot over temping or over revving = Walters. I do know that the new TSLM that is installed on most Walters = now records engine parameters. The problem with these records is that = there seems to be spikes in the system that it also records. These are = split second spikes that are errors but it records them anyways due to = the accuracy of the system. I did notice that on my turbine we had to = put quite a few capacitors in the wiring to reduce these spikes that = were occurring. We noticed things like hydraulic pump actuation causing = ITT spikes and various other power draws doing the same thing until we = put these capacitor "filters" in the wiring to get rid of these power = spikes and false readings. I believe that this may have something to do = with these rumors as we were talking about these issues with the TSLM at = the Sebring annual recurrent training course. These power spikes = effected quite a few of my engine readings until they were rectified. = The Walter ITT readings are always bouncing around anyways and are never = as steady as what you would see from a Pratt. Barney Britton IVPT C-GPOA ----- Original Message -----=20 From: reddog=20 To: Lancair Mailing List=20 Sent: Wednesday, May 24, 2006 5:06 PM Subject: [LML] turbines over temps & rpm=20 Can anyone on the list enlighten me to which test pilot is over = temping and over revving the Walters on the east coast -rumor . Also a = test pilot gear up landing in Florida several mounts back -would like = details on these if known . This is something that seems to be a rumor = but would like a clarification Bill Maddox=20 ------=_NextPart_000_004D_01C68007.B4562A30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Barney,
 
We have changed the software so it = would not count=20 the occasional spike caused by the tachgen as an event during the = initial=20 testing development of the TSLM and with the over 40 = planes=20 flying with the TSLM have not had any complaints.
We have downloads showing Lancairs with = significant=20 over temps , N2 in excess of 2080 rpm by as much as 300 plus rpm and = over torque=20 during test flights for a couple of seconds at a time and usually the = over temp=20 , over speed and over torque happens simultaneously. According to our = customers=20 these over temps are done by various pilots including Lancair test = pilots.=20 Diemech Turbines has this data recorded on file, in most cases = Diemech=20 Turbines found it necessary to open up engines to repair the=20 damage.
 
It is also important to note that with = regards to=20 using the 84 inch prop especially over speeding the N2 on landing = on a=20 short strip at high elevation with a Lancair IV T that you = have Beta=20 Limiting activated in the configuration and wired up, as you can easily=20 exceed 1900 RPM ( Walter Manual )  in Beta / Reverse = during=20 landing.
It has been demonstrated on = a plane with a=20  99 inch prop as well.
 
Regards,
Maurits
 
 
 
----- Original Message -----
From:=20 Barney=20 Briton
Sent: Wednesday, May 24, 2006 = 4:43=20 PM
Subject: [LML] Re: turbines = over temps=20 & rpm

Bill
 
I have not heard of any test pilot = over temping=20 or over revving Walters.  I do know that the new TSLM that is = installed=20 on most Walters now records engine parameters.  The problem with = these=20 records is that there seems to be spikes in the system that it also=20 records.  These are split second spikes that are errors but it = records=20 them anyways due to the accuracy of the system.  I did notice = that on my=20 turbine we had to put quite a few capacitors in the wiring to reduce = these=20 spikes that were occurring.  We noticed things like hydraulic = pump=20 actuation causing ITT spikes and various other power draws doing the = same=20 thing until we put these capacitor "filters" in the wiring to get rid = of these=20 power spikes and false readings.  I believe that this may have = something=20 to do with these rumors as we were talking about these issues with the = TSLM at=20 the Sebring annual recurrent training course.  These power spikes = effected quite a few of my engine readings until they were = rectified. =20 The Walter ITT readings are always bouncing around anyways and are = never as=20 steady as what you would see from a Pratt.
 
Barney Britton
IVPT C-GPOA
----- Original Message -----
From:=20 reddog=20
Sent: Wednesday, May 24, 2006 = 5:06=20 PM
Subject: [LML] turbines over = temps=20 & rpm

Can anyone on the list = enlighten=20 me to which test pilot is over temping and over revving the Walters = on the=20 east coast =96rumor . Also a test pilot gear up landing  in = Florida = several=20 mounts back =96would like details on these if known . This is = something that=20 seems to be  a rumor but would like a clarification  Bill = Maddox=20 =

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