X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 01 Nov 2013 11:55:34 -0400 Message-ID: X-Original-Return-Path: Received: from nm3-vm6.bullet.mail.ne1.yahoo.com ([98.138.91.96] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6572999 for lml@lancaironline.net; Fri, 01 Nov 2013 11:50:41 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.91.96; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.226.177] by nm3.bullet.mail.ne1.yahoo.com with NNFMP; 01 Nov 2013 15:50:05 -0000 Received: from [98.138.89.173] by tm12.bullet.mail.ne1.yahoo.com with NNFMP; 01 Nov 2013 15:50:05 -0000 Received: from [127.0.0.1] by omp1029.mail.ne1.yahoo.com with NNFMP; 01 Nov 2013 15:50:04 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 997226.26631.bm@omp1029.mail.ne1.yahoo.com Received: (qmail 99954 invoked by uid 60001); 1 Nov 2013 15:50:04 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=hjmdIIwfbYH9p59Sg8ZPsnBIim3rsB1hi4w2qLP9BgPaUKqb3jW39q12uLtP7XkkLPiWOaF3IP50d7jq3nGUPsRJJmUScTkYInoT4Kf2aMynOGxYn2iK4ZMERyp3NGbQ5APCahTgd+Vqt+ty9rLtlxOSjDF9eT8YOyIy7xhhq6g=; X-YMail-OSG: G2hhSyIVM1mnnfS6cpohlLgttpTC6nL33DwLvE3GA1VWBx6 Lsp4AP3FA91FABgbWYwK5pWjOgBTOFofpbfm7B1ShiYdJREZfy7Jyu_yHIuF 77Z_KBckh_hLm4RZg8sKOnfrPAEpHnGM1hTtn7mnRbVi3izoOW.j83sFeqTA HvTyfh2GaKgZRycbQNHeYMERXWnsNZZ2yWL3lQt27RS_NF31fBMMfUOruISJ g2nGSlmLhtLt6omUk1ZnPZbGWaOQbsGOxTLfZut9Re2qn4mRVsxjkkB9vjrX hRrquU7s9X8DihU4DTttURQdgf1UarTGg2llaUDRGMoAwSVSMYwC43u.3LFF aPpFs9ZSTATWWYhgxQPcjitEL65ti8pXcwEkuq29c85knLf6IL.RVQrNHYY0 JfOrHl1V6LScK3Z8AIoXFnO7Gl5cnp3p2SMouT_pL_e98RmDKsf3OrkPP3kI jQT4EBbY6UI.vRZRSstlPDCYofGvEpbSESEMHKwO.mzuA6Ej1cDEUx0sdYwX wA35V1p2ek6_qGeo5cD97YxIji07lJDZDDCYuIAnifrVCVOcS51tYKHkECd_ Xz3.0zUyTLWqcDQTrt0TyBDedVwcHEmEkWN8ZooSusJeI30OqgsJ8T8PmdI_ 1oo6E69vjFkpXs2hkQh6urVy2msM_vlltBZSze6Yzdu3I8udNCp7wkD2mFeD .rX.vUUsStG8mh1WckQppGNkdgDaWKNVsaE0Mk0PtNSMRLdEMr8phfyAPnek DGM6sn2NeHSu8YkLghCnsaw-- Received: from [172.14.16.72] by web121602.mail.ne1.yahoo.com via HTTP; Fri, 01 Nov 2013 08:50:03 PDT X-Rocket-MIMEInfo: 002.001,TXkgY29uY2VybiB3b3VsZCBiZSB0aGUgZWZmZWN0IG9uIGZsdXR0ZXIgY2hhcmFjdGVyaXN0aWNzIG9mIHRoZSB3aW5nLsKgIEluIHRoZSBjZXJ0aWZpZWQvbWlsaXRhcnkgd29ybGTCoHdoZW4gZXh0ZXJuYWwgc3RvcmVzIGFyZSBhZGRlZCB0byBhIHdpbmcgaXQgcmVxdWlyZXMgYW5hbHlzaXMgYW5kIHRlc3RpbmcgdG8gY2hlY2sgdGhlwqBuZXcgbW9kZXMgdGhhdCBhcmUgaW50cm9kdWNlZC7CoCBJIGRvbid0IGtub3cgd2hhdCBhbmFseXNpcyBhbmQvb3IgdGVzdGluZyBMYW5jYWlyIGRpZCBvbiB0aGUgb3IBMAEBAQE- X-Mailer: YahooMailWebService/0.8.161.596 References: X-Original-Message-ID: <1383321003.99306.YahooMailNeo@web121602.mail.ne1.yahoo.com> X-Original-Date: Fri, 1 Nov 2013 08:50:03 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: Tip tanks X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-2038480821-533742144-1383321003=:99306" ---2038480821-533742144-1383321003=:99306 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable My concern would be the effect on flutter characteristics of the wing.=A0 I= n the certified/military world=A0when external stores are added to a wing i= t requires analysis and testing to check the=A0new modes that are introduce= d.=A0 I don't know what analysis and/or testing Lancair did on the original= design.=A0 General aviation is much less stringent in flutter analysis tha= n are commercial transport and military.=A0 Ground vibration and instrument= ed flight test would be a good idea.=0AThe following paper contains a numbe= r of flutter case studies some of which involved adding stores to wings.=0A= http://www.n91cz.com/Flutter/Flutter-ADA328059.pdf=0A=A0=0AChris Zavatson= =0AN91CZ=0A360std=0Ahttp://www.n91cz.net/=0A=0A=0A=0AOn Friday, November 1,= 2013 7:15 AM, Ted Noel wrote:=0A =0AI asked this bas= ic question a few years ago. In essence, Beech did this with some Bonanzas = and Cessna did it with 310's. It turned out to increase acceptable gross we= ight because it changed the spanwise weight distribution to reduce flexing = loads on the wing. With proper design, the tanks also acted like winglets t= o reduce drag in some flight regimes.=0A=0ATed Noel=0A=0A=0A=0AOn 11/1/2013= 7:24 AM, JIM HANKINS wrote:=0A =0ADoes anyone know of a valid reason for n= ot installing 15 gal tip tanks on a Lancair IVP turboprop?=A0 I made provis= ions for =0A>this when I was building, but to my knowledge it has not been= widely done.=A0 Adjustment of the angle of attack on the tanks would be we= lcome. =0A>=0A>Most comments on this would be appreciated. =0A>=0A>Jim Hank= ins =0A>No virus found in this message.=0A>Checked by AVG - http://www.avg= .com/=0A>Version: 2014.0.4158 / Virus Database: 3615/6797 - Release Date:= =0A 10/31/13 ---2038480821-533742144-1383321003=:99306 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
My concern= would be the effect on flutter characteristics of the wing.  In the c= ertified/military world when external stores are added to a wing it re= quires analysis and testing to check the new modes that are introduced= .  I don't know what analysis and/or testing Lancair did on the origin= al design.  General aviation is much less stringent in flutter analysi= s than are commercial transport and military.  Ground vibration and in= strumented flight test would be a good idea.
The fol= lowing paper contains a number of flutter case studies some of which involv= ed adding stores to wings.
&nbs= p;
Chris Zavatson
N91CZ
=
360std


On Friday, N= ovember 1, 2013 7:15 AM, Ted Noel <tednoel@cfl.rr.com> wrote:
=0A = =0A=0A =0A =0A
=0A I asked this basic question a few years ago= . In essence, Beech did=0A this with some Bonanzas and Cessna did it wit= h 310's. It turned out=0A to increase acceptable gross weight because it= changed the spanwise=0A weight distribution to reduce flexing loads on = the wing. With proper=0A design, the tanks also acted like winglets to r= educe drag in some=0A flight regimes.
=0A
=0A Ted Noel
= =0A
=0A
=0A
On= 11/1/2013 7:24 AM, JIM HANKINS=0A wrote:
=0A
=0A =0A
=0A
Does anyone know of a valid reason= for not installing 15=0A gal tip tanks on a Lancair IVP turboprop= ?  I made provisions=0A for
=0A
this when I= was building, but to my knowledge it has not=0A been widely done.=   Adjustment of the angle of attack on the=0A tanks would be = welcome.
=0A
 
=0A
Most comments on = this would be appreciated.
=0A
 
=0A Jim Hankins
=0A
=0A
No virus=0A found in this message.
=0A Checked = by AVG - http://www.avg.com/
=0A Version: 2014.0.4158 / Virus Databas= e: 3615/6797 - Release Date:=0A 10/31/13
=0A = =0A
=0A
=0A=0A


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