X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 01 Nov 2013 14:15:53 -0400 Message-ID: X-Original-Return-Path: Received: from mta11.charter.net ([216.33.127.80] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6573243 for lml@lancaironline.net; Fri, 01 Nov 2013 13:55:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.80; envelope-from=troneill@charter.net Received: from imp11 ([10.20.200.11]) by mta11.charter.net (InterMail vM.8.01.05.09 201-2260-151-124-20120717) with ESMTP id <20131101175452.DQZP6169.mta11.charter.net@imp11> for ; Fri, 1 Nov 2013 13:54:52 -0400 Received: from [192.168.2.3] ([75.132.162.230]) by imp11 with smtp.charter.net id kHur1m00U4yZwCz05Hurqm; Fri, 01 Nov 2013 13:54:52 -0400 X-Authority-Analysis: v=2.0 cv=KYGKKnkD c=1 sm=1 a=SmX8XOgDoNe7CI0pWN500A==:17 a=yUnIBFQkZM0A:10 a=hOpmn2quAAAA:8 a=XTYWRwktn_QA:10 a=ndVRne3UAAAA:8 a=5FIZSGrRAAAA:8 a=ayC55rCoAAAA:8 a=oCcaPWc0AAAA:8 a=HI9LLVA0HrIh2I8OoPgA:9 a=CjuIK1q_8ugA:10 a=uMOpxnXHEilaL7kLH4MA:9 a=_W_S_7VecoQA:10 a=tXsnliwV7b4A:10 a=V7JPfglUckDYAoAS:21 a=SmX8XOgDoNe7CI0pWN500A==:117 From: Terrence O'Neill Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-78--853117501 Subject: Re: [LML] Re: Tip tanks X-Original-Date: Fri, 1 Nov 2013 12:54:51 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <93AFD706-92E1-4DB2-A94B-8651D331C480@charter.net> X-Mailer: Apple Mail (2.1085) --Apple-Mail-78--853117501 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Tip tanks (mass and centrifugal force) also affect spin recovery. Terrence O'Neill N211AL 235/320 On Nov 1, 2013, at 10:55 AM, Chris Zavatson wrote: > My concern would be the effect on flutter characteristics of the wing. = In the certified/military world when external stores are added to a = wing it requires analysis and testing to check the new modes that are = introduced. I don't know what analysis and/or testing Lancair did on = the original design. General aviation is much less stringent in flutter = analysis than are commercial transport and military. Ground vibration = and instrumented flight test would be a good idea. > The following paper contains a number of flutter case studies some of = which involved adding stores to wings. > http://www.n91cz.com/Flutter/Flutter-ADA328059.pdf > =20 > Chris Zavatson > N91CZ > 360std > http://www.n91cz.net/ >=20 >=20 > On Friday, November 1, 2013 7:15 AM, Ted Noel = wrote: > I asked this basic 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 weight because it changed the spanwise weight = distribution to reduce flexing loads on the wing. With proper design, = the tanks also acted like winglets to reduce drag in some flight = regimes. >=20 > Ted Noel >=20 >=20 > On 11/1/2013 7:24 AM, JIM HANKINS wrote: >> Does anyone know of a valid reason for not installing 15 gal tip = tanks on a Lancair IVP turboprop? I made provisions for >> this when I was building, but to my knowledge it has not been widely = done. Adjustment of the angle of attack on the tanks would be welcome. >> =20 >> Most comments on this would be appreciated. >> =20 >> Jim Hankins >> No virus found in this message. >> Checked by AVG - http://www.avg.com/ >> Version: 2014.0.4158 / Virus Database: 3615/6797 - Release Date: = 10/31/13 >=20 >=20 >=20 --Apple-Mail-78--853117501 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Tip = tanks (mass and centrifugal force) also affect spin = recovery.

Terrence = O'Neill
N211AL
235/320

On = Nov 1, 2013, at 10:55 AM, Chris Zavatson wrote:

My concern would be = the effect on flutter characteristics of the wing.  In the = certified/military world when external stores are added to a wing = it requires analysis and testing to check the new modes that are = introduced.  I don't know what analysis and/or testing Lancair did = on the original design.  General aviation is much less stringent in = flutter analysis than are commercial transport and military.  = Ground vibration and instrumented flight test would be a good = idea.
The following paper contains a number of = flutter case studies some of which involved adding stores to = wings.
&nb= sp;
Chris = Zavatson
N91CZ
360std=


=
On Friday, November = 1, 2013 7:15 AM, Ted Noel <tednoel@cfl.rr.com> wrote:
=
=20 =20 =20
I asked this basic 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 weight because it changed the spanwise weight distribution to reduce flexing loads on the wing. With proper design, the tanks also acted like winglets to reduce drag in some flight regimes.

Ted Noel


On 11/1/2013 7:24 AM, = JIM HANKINS wrote:
Does anyone know of a valid reason for not installing 15 gal tip tanks on a Lancair IVP turboprop?  I made = provisions for
this when I was building, but to my knowledge it has not been widely done.  Adjustment of the angle of attack on = the tanks would be welcome.
 
Most comments on this would be appreciated.
 
Jim Hankins
No virus found in this message.
Checked by AVG - http://www.avg.com/
Version: 2014.0.4158 / Virus Database: 3615/6797 - Release Date: 10/31/13



=

= --Apple-Mail-78--853117501--