X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 13 Jun 2007 02:56:06 -0400 Message-ID: X-Original-Return-Path: Received: from wx-out-0506.google.com ([66.249.82.233] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2099346 for lml@lancaironline.net; Tue, 12 Jun 2007 23:12:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.233; envelope-from=akadamson@gmail.com Received: by wx-out-0506.google.com with SMTP id t11so49712wxc for ; Tue, 12 Jun 2007 20:11:51 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:from:to:references:subject:date:message-id:mime-version:content-type:x-mailer:x-mimeole:thread-index:in-reply-to:sender; b=UreG/mbe0LlL3fc3HBPLc30WmqlvbbB0rN47y5cTLnbGuxxGBStHMfsoVMPRlLhcuuiLoW1e0h0QGmlkYfD9DQCYEugQtMhMH46tYDC6pBGEIu8cijuaGm59mbHjtjaNjd4NM0cavZYcgloK4L9I/aL4gJRU4s9mneNo4yArt1Q= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:from:to:references:subject:date:message-id:mime-version:content-type:x-mailer:x-mimeole:thread-index:in-reply-to:sender; b=E39P/kHLR/XNrUXUl/PedBlZh6fdh4K2oje/M3286EhkO8mqenCcpQbTSIfs9LdRE/SyVdI1N2T9Pb3v8f4Hdp9jOijRLRNAoZ3QgRCjk6RQh5IJj28FLTrC+uQ6DkjyDKdxzAyraEyEs/gph4SjNYApcP4kdvRYivHQFy7Usm8= Received: by 10.90.98.3 with SMTP id v3mr66615agb.1181704311618; Tue, 12 Jun 2007 20:11:51 -0700 (PDT) X-Original-Return-Path: Received: from Typhoon ( [76.97.47.101]) by mx.google.com with ESMTP id 38sm330808aga.2007.06.12.20.11.50 (version=SSLv3 cipher=RC4-MD5); Tue, 12 Jun 2007 20:11:51 -0700 (PDT) From: "Alan Adamson" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Boost Pump X-Original-Date: Tue, 12 Jun 2007 23:11:49 -0400 X-Original-Message-ID: <01eb01c7ad68$95e07df0$2201a8c0@highrf.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01EC_01C7AD47.0ECEDDF0" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Thread-Index: AcetZ10vW6RJQEbpTzu3toNL4Mg58AAAKJsQ In-Reply-To: X-Original-Sender: Alan Adamson This is a multi-part message in MIME format. ------=_NextPart_000_01EC_01C7AD47.0ECEDDF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Like I said, I certainly wish there was more supportive data around to determine the best approach... I just offer some unqualified food for thot... Looks like I succeeded :) Dennis, yes you are correct, I'm certainly not proposing any changes to the fuel system, just thinking outloud about the use of boost pumps. BTW, if you want to keep a single switch Eaton makes a DPDT 3 position switch with a manual lockable position on one side. So it works as a toggle to the middle position and then to go to the 3rd position, you'd have to pull out on the lever and move it to the 3rd position and then it will be locked in that position until you pull the lever out. This way, you could use OFF and Low boost on the toggle side, and if needed HIGH boost, locked if needed in an emergency. That's what I was going to do until I went down the Vertical Power route. Alan _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dennis Johnson Sent: Tuesday, June 12, 2007 10:47 PM To: lml@lancaironline.net Subject: [LML] Boost Pump boost pump is on low; the engine keeps idling. According to Flying Magazine's September 2004 Aftermath column, a Bonanza with a TCM TSIO-520 crashed shortly after takeoff probably because the pilot inadvertently had the boost pump in the high position. According to the article, full power operation with the boost pump on high would not cause an appreciable loss of power, but (according to the NTSB) when manifold pressure is reduced below 24 inches, the engine will quit. ------=_NextPart_000_01EC_01C7AD47.0ECEDDF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Like I said, I certainly wish there was more = supportive=20 data around to determine the best approach... I just offer some = unqualified food=20 for thot... Looks like I succeeded :)
 
Dennis, yes you are correct, I'm certainly = not=20 proposing any changes to the fuel system, just thinking outloud about = the use of=20 boost pumps.
 
BTW, if you want to keep a single = switch  Eaton=20 makes a DPDT 3 position switch with a manual lockable position on one=20 side.  So it works as a toggle to the middle position and then to = go to the=20 3rd position, you'd have to pull out on the lever and move it to the 3rd = position and then it will be locked in that position until you pull the = lever=20 out.
 
This way, you could use OFF and Low boost on = the toggle=20 side, and if needed HIGH boost, locked if needed in an emergency.  = That's=20 what I was going to do until I went down the Vertical Power=20 route.
 
Alan

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Dennis=20 Johnson
Sent: Tuesday, June 12, 2007 10:47 PM
To:=20 lml@lancaironline.net
Subject: [LML] Boost = Pump

boost pump is on low; the engine = keeps=20 idling.
 
According to Flying = Magazine's=20 September 2004 Aftermath column, a Bonanza with a TCM TSIO-520 = crashed=20 shortly after takeoff probably because the pilot inadvertently had the = boost=20 pump in the high position.  According to the article, full power = operation=20 with the boost pump on high would not cause an appreciable loss of = power, but=20 (according to the NTSB) when manifold pressure is reduced below 24 = inches, the=20 engine will quit.
 
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