X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 02 Apr 2007 10:35:31 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1962016 for lml@lancaironline.net; Mon, 02 Apr 2007 08:08:21 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.63; envelope-from=liegner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=FrDBCo/jYzWcTkJlflLNwPLNv5qNcrotzUtN9uoXbsP/nbSjTPZRiGh4wIX1btic; h=Received:Mime-Version:X-Sender:Message-Id:In-Reply-To:References:Date:To:From:Subject:Cc:Content-Type:X-ELNK-Trace:X-Originating-IP; Received: from [69.68.166.4] (helo=[172.16.1.4]) by elasmtp-junco.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1HYLJv-0004ng-6d; Mon, 02 Apr 2007 08:07:35 -0400 Mime-Version: 1.0 X-Sender: liegner@earthlink.net@pop.earthlink.net X-Original-Message-Id: In-Reply-To: References: X-Original-Date: Mon, 2 Apr 2007 08:07:38 -0400 X-Original-To: lml@lancaironline.net From: "Jeffrey Liegner, MD" Subject: Re: [LML] Lancair IVP Wing...Unuseable Fuel Quantity? X-Original-Cc: Sky2high@aol.com Content-Type: multipart/alternative; boundary="============_-1036606829==_ma============" X-ELNK-Trace: edc6c9c2805b57e3d780f4a490ca69563f9fea00a6dd62bcaa2475285d12e1a522ac33e02241c826350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 69.68.166.4 --============_-1036606829==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" I assume the highest number from this test sequence would represent the prudent "official" in-flight redline for the tank's fuel quantity. > > >Jeff, > >Consider at least 4 conditions, three of them can be tested on the ground. > >1. Level as in level un-accelerated cruise flight. > >2. X degrees nose down attitude that might be used in straight >line extreme descents with air brakes and perhaps gear extended. >This condition can be fixed temporarily by reducing X or switching >to a fuller tank if the measurement device is accurate in such an >attitude. > >3. X degrees nose up attitude used in straight Vx or Vy climbs. See # 2. > >4. Slip/skid extended flight to test the size and seal of the slosh >chamber when the wing fuel is "low". Most "ball out" flight is done >at low power so the fuel draw is reduced. > >Items 1, 2 and 3 could be tested on the ground with the wings >attached (hard) or a jig could be built to test just the wing by >holding the proper dihedral and incidence. Water and a pump could >be used to find when the fluid would become un-ported. Then it is >just a matter of measuring how much fluid was present when the >un-porting occurred. > >Scott Krueger AKA Grayhawk >Lancair N92EX IO320 SB 89/96 >Aurora, IL (KARR) > >Darwinian culling phrase: Watch This! > > --============_-1036606829==_ma============ Content-Type: text/html; charset="us-ascii" Re: [LML] Lancair IVP Wing...Unuseable Fuel Quantity?
I assume the highest number from this test sequence would represent the prudent "official" in-flight redline for the tank's fuel quantity.




Jeff,
 
Consider at least 4 conditions, three of them can be tested on the ground.
 
1. Level as in level un-accelerated cruise flight.
 
2. X degrees nose down attitude that might be used in straight line extreme descents with air brakes and perhaps gear extended.  This condition can be fixed temporarily by reducing X or switching to a fuller tank if the measurement device is accurate in such an attitude.
 
3. X degrees nose up attitude used in straight Vx or Vy climbs.  See # 2.
 
4. Slip/skid extended flight to test the size and seal of the slosh chamber when the wing fuel is "low".  Most "ball out" flight is done at low power so the fuel draw is reduced.
 
Items 1, 2 and 3 could be tested on the ground with the wings attached (hard) or a jig could be built to test just the wing by holding the proper dihedral and incidence.  Water and a pump could be used to find when the fluid would become un-ported.  Then it is just a matter of measuring how much fluid was present when the un-porting occurred.
 
Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
Darwinian culling phrase: Watch This!


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