X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 21 Jun 2009 20:30:22 -0400 Message-ID: X-Original-Return-Path: Received: from [64.12.143.100] (HELO imo-m12.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3689744 for lml@lancaironline.net; Sat, 20 Jun 2009 21:37:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.143.100; envelope-from=VTAILJEFF@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imo-m12.mail.aol.com (v107.10) with ESMTP id RELAYIN2-34a3d8ebf398; Sat, 20 Jun 2009 21:37:03 -0400 Received: from VTAILJEFF@aol.com by imo-da04.mx.aol.com (mail_out_v40_r1.5.) id q.d49.4a60c3dc (65098) for ; Sat, 20 Jun 2009 21:37:02 -0400 (EDT) From: VTAILJEFF@aol.com X-Original-Message-ID: X-Original-Date: Sat, 20 Jun 2009 21:37:09 EDT Subject: Re: [LML] Re: Boost pump question X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1245548229" X-Mailer: AOL 9.1 sub 5003 X-Spam-Flag:NO X-AOL-IP: 205.188.169.202 -------------------------------1245548229 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en A big cause of accidents is an imperfect memory that we all seem to have= -- gear up landings, open doors on takeoff, etc. IMHO I try to simplify flying... boost pump on low from start to takeoff. I have almost 1300 hou= rs on the IVP and the boost pump still works great. If you think you will wear= it out --fuggetabout it. It will only take one or two times of the engine = dying above 10,000 msl to convince you otherwise. BTW 10,000 feet msl is= not very high when you are taking off at Steamboat. Jeff In a message dated 6/19/2009 11:23:55 A.M. Central Daylight Time, rpastusek@htii.com writes: Dan Reagan writes: =E2=80=A6 when I am rewiring the fuel pump, do I need both the high and= the low speeds? My dumb question of the day is, when is the fuel pump supposed= to be used on the TSIO550 in the Lancair IVP? Dan, I was advised by several owner/fliers to run the boost pump in =E2=80=9Cl= ow=E2=80=9D speed above 10,000=E2=80=99--only. A good friend with lots of experience= in Lancair IV-P =E2=80=99s runs his fuel pump on low at all times. I have chosen the form= er route, and have an altitude/pressure switch hooked to a light that reminds me to= switch to low boost when passing 10,000=E2=80=99 climbing, and to turn it= off when descending. I have set up the engine to flow 43 GPH at 2700 RPM and 38.5=E2=80=9D MP= on takeoff with the boost pump off. Turning on the low boost raises the fuel= flow about 2 GPH at max power, but high boost increases it so much that the en= gine floods/quits=E2=80=9448 GPH or so. I intentionally left the low boost off after heat soaking at an airshow= during climb out two weeks ago. The engine rolled back at about 14,000=E2= =80=99 and the fuel flow was erratic (I did not look at the pressure, but will do so= if it happens again=E2=80=A6) I turned the boost pump to low and the engine= recovered almost immediately=E2=80=A6 So for my money; boost pump off for all operations below 10,000=E2=80=99,= and on above. Keep high boost for purging/starting, and any time you have fuel= starvation, such as vaporization or loss of the engine pump. Expect to ha= ve to modulate the fuel flow manually with the mixture control any time you=E2= =80=99re running high boost=E2=80=A6 Views of others? Bob **************Download the AOL Classifieds Toolbar for local deals at your= fingertips. (http://toolbar.aol.com/aolclassifieds/download.html?ncid=3Demlcntusdown00= 000004) -------------------------------1245548229 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
A big cause of accidents is an imperfect memory that we all seem to= have -- gear up landings, open doors on takeoff, etc. IMHO I try to simplify flyin= g... boost pump on low from start to takeoff. I have almost 1300 hours on the= IVP and the boost pump still works great. If you think you will wear it out --fuggetabout it. It will only take one or two times of the engine = dying above 10,000 msl to convince you otherwise. BTW 10,000 feet msl is not ver= y high when you are taking off at Steamboat.
 
Jeff
 
In a message dated 6/19/2009 11:23:55 A.M. Central Daylight Time, rpastusek@htii.com writes:

Dan Reagan writes:

=E2=80=A6 when I am= rewiring the fuel pump, do I need both the high and the low speeds?  My dumb= question of the day is, when is the fuel pump supposed to be used= on the TSIO550 in the Lancair IVP?

 

Dan,

I was advised by several owner/fliers to run the boost pump in =E2=80=9Clo= w=E2=80=9D speed above 10,000=E2=80=99--only. A good friend with lots of experience in Lancair= IV-P=E2=80=99s runs his fuel pump on low at all times. I have chosen the former route, and= have an altitude/pressure switch hooked to a light that reminds me to switch to= low boost when passing 10,000=E2=80=99 climbing, and to turn it off when des= cending.

 

I have set up the engine to flow 43 GPH at 2700 RPM and 38.5=E2=80=9D MP= on takeoff with the boost pump off. Turning on the low boost raises the fuel flow about= 2 GPH at max power, but high boost increases it so much that the engine floods/quits=E2=80=9448 GPH or so.

 

I intentionally left the low boost off after heat soaking at an airshow du= ring climb out two weeks ago. The engine rolled back at about 14,000=E2=80=99= and the fuel flow was erratic (I did not look at the pressure, but will do so if it= happens again=E2=80=A6) I turned the boost pump to low and the engine recovered= almost immediately=E2=80=A6

 

So for my money; boost pump off for all operations below 10,000=E2=80=99,= and on above. Keep high boost for purging/starting, and any time you have fuel starvat= ion, such as vaporization or loss of the engine pump. Expect to have to modul= ate the fuel flow manually with the mixture control any time you=E2=80=99re= running high boost=E2=80=A6

 

Views of others?

 

Bob


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