X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 31 Aug 2011 07:42:30 -0400 Message-ID: X-Original-Return-Path: Received: from smtp174.dfw.emailsrvr.com ([67.192.241.174] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5108661 for lml@lancaironline.net; Tue, 30 Aug 2011 14:48:11 -0400 Received-SPF: none receiver=logan.com; client-ip=67.192.241.174; envelope-from=walter@advancedpilot.com Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp7.relay.dfw1a.emailsrvr.com (SMTP Server) with ESMTP id 50370258779 for ; Tue, 30 Aug 2011 14:47:34 -0400 (EDT) X-Virus-Scanned: OK Received: by smtp7.relay.dfw1a.emailsrvr.com (Authenticated sender: walter-AT-advancedpilot.com) with ESMTPSA id ED01125855A for ; Tue, 30 Aug 2011 14:47:33 -0400 (EDT) From: Walter Atkinson Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-2--732079042 Subject: Re: [LML] Re: LOP Academics X-Original-Date: Tue, 30 Aug 2011 12:47:33 -0600 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <94FC31A5-0512-4598-8938-C60082359D05@advancedpilot.com> X-Mailer: Apple Mail (2.1084) --Apple-Mail-2--732079042 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On the night before Lindy left for Paris he was at Roosevelt field = tweaking the three carburetors on the Ryan so he could make it to Paris = without swimming. The simplistic action of using the entire mixture = curve was appreciated in the mid twenties and getting all of the F:A = ratios balanced was a prime concern of his. This "common knowledge" = became lost to the general aviation community in the 1950s and 60s. We = simply dug it back up--to the great consterntaion of the "new" experts = who were unfamiliar with the lean side of the mixture curve. There is lore of his teaching LOP ops to the P-38 pilots in the Pacific = which is, however, incorrect. According to M.F. Kirby, a good friend of = mine and P-38 ACE who was present for Lindy's talks said they only = talked about using low RPM and high MP as a method to extend range. LOP = ops were not discussed. That makes sense since the P-38 could not be = manually leaned. It had Emergency Rich, Full Rich, Auto Lean and Idle = cutoff settings only. Auto Lean was set to Best power. (the only WWII = aircraft which was routinely flown LOP was the B-24 Liberator) For those interested, Lindy's methods to expend range were not popular = with the P-38 pilots since it reduced TAS. They wanted to maintain = optimal TAS so when the enemy was engaged, there was no "spool up" in = speed required. As Kirby told me, "We had lots of engines, enough = planes, plenty of mechanics but only one me." Walter On Aug 30, 2011, at 8:41 AM, Lancair wrote: Funny: I thought it was Lindbergh who championed LoP operation. Walter = must be older than he looks! =20 ;-) =20 Robert =20 =20 From: Colyn Case [mailto:colyncase@earthlink.net]=20 Sent: Monday, August 29, 2011 2:07 PM Subject: Re: [LML] LOP Academics APS has pretty much single-handedly got the industry going in the LOP = direction. That's worth $995 to me right there. =20 Colyn =20 -- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html --Apple-Mail-2--732079042 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii On the night before Lindy left for Paris he was at = Roosevelt field tweaking the three carburetors on the Ryan so he could = make it to Paris without swimming.  The simplistic action of using = the entire mixture curve was appreciated in the mid twenties and getting = all of the F:A ratios balanced was a prime concern of his.  This = "common knowledge" became lost to the general aviation community in the = 1950s and 60s.  We simply dug it back up--to the great = consterntaion of the "new" experts who were unfamiliar with the lean = side of the mixture curve.

There is lore of his = teaching LOP ops to the P-38 pilots in the Pacific which is, however, = incorrect.  According to M.F. Kirby, a good friend of mine and P-38 = ACE who was present for Lindy's talks said they only talked about using = low RPM and high MP as a method to extend range. LOP ops were not = discussed.  That makes sense since the P-38 could not be manually = leaned.  It had Emergency Rich, Full Rich, Auto Lean and Idle = cutoff settings only.  Auto Lean was set to Best power.  (the = only WWII aircraft which was routinely flown LOP was the B-24 = Liberator)

For those interested, Lindy's = methods to expend range were not popular with the P-38 pilots since it = reduced TAS.  They wanted to maintain optimal TAS so when the enemy = was engaged, there was no "spool up" in speed required.  As Kirby = told me, "We had lots of engines, enough planes, plenty of mechanics but = only one = me."

Walter


On Aug 30, 2011, at 8:41 AM, Lancair wrote:

Funny: I thought it was = Lindbergh who championed LoP operation.  Walter must be older than = he looks!
From: Colyn Case = [mailto:colyncase@earthlink.net] 
Sent: Monday, August 29, 2011 = 2:07 PM
Subject: Re: [LML] LOP = Academics
APS has pretty much single-handedly got the industry = going in the LOP direction.   That's worth $995 to me right = there.