X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 28 Apr 2008 21:06:53 -0400 Message-ID: X-Original-Return-Path: Received: from mta10.adelphia.net ([68.168.78.202] verified) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTP id 2874592 for lml@lancaironline.net; Sun, 27 Apr 2008 17:54:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.202; envelope-from=super_chipmunk@roadrunner.com Received: from Laptop ([74.75.176.139]) by mta10.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with SMTP id <20080427215447.XZCR7569.mta10.adelphia.net@Laptop> for ; Sun, 27 Apr 2008 17:54:47 -0400 X-Original-Message-ID: From: "Bill Wade" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Stabilizer flexing X-Original-Date: Sun, 27 Apr 2008 17:53:44 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00FF_01C8A88F.A2E18EE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MIMEOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 This is a multi-part message in MIME format. ------=_NextPart_000_00FF_01C8A88F.A2E18EE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This may relate to something I just noticed and was wondering about. I = have my horizontal stabilizer on cradles, one end weighted and the = assembly pivoting at BL 0. The rear spar seems to flex fairly easily = causing the hinge alignment to change. A force of 11 roughly pounds at = the unweighted end will deflect it 3/16". Is this what would be = expected? -Bill Wade IV-P ----- Original Message -----=20 From: Bill Hannahan=20 To: lml@lancaironline.net=20 Sent: Friday, April 25, 2008 10:28 AM Subject: [LML] Window Strength The hole that has always concerned me is the inspection hole at the = smallest diameter of the IV fuselage, just ahead of the horizontal stab. = Next time your near a IV hold the tip of the horizontal stab between = your thumb and index finger and apply 3 pounds of force alternating in = an up and down direction. Increase the frequency until you hit the = resonant frequency. Continue applying the 3 pounds of force at that = frequency and watch the amplitude increase. Try it with and without the = cover attached. If I had a IV I would attach that cover with many screws and keep them = tight. This does not work on the small tail 360, the resonant frequency is = too high. Regards, Bill Hannahan wfhannahan@yahoo.com -------------------------------------------------------------------------= ----- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try = it now. ------=_NextPart_000_00FF_01C8A88F.A2E18EE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
  This may relate to = something I=20 just noticed and was wondering about. I have my horizontal = stabilizer on=20 cradles, one end weighted and the assembly pivoting at BL 0. = The rear spar=20 seems to flex fairly easily causing the hinge alignment to = change. A force=20 of 11 roughly pounds at the unweighted end will deflect it=20 3/16". Is this what would be expected?   -Bill Wade  = IV-P
----- Original Message -----
From:=20 Bill=20 Hannahan
Sent: Friday, April 25, 2008 = 10:28=20 AM
Subject: [LML] Window = Strength

The hole that has always concerned me is the = inspection=20 hole at the smallest diameter of the IV fuselage, just ahead of the = horizontal=20 stab. Next time your near a IV hold the tip of the horizontal stab = between=20 your thumb and index finger and apply 3 pounds of force alternating in = an up=20 and down direction. Increase the frequency until you hit the resonant=20 frequency. Continue applying the 3 pounds of force at that frequency = and watch=20 the amplitude increase. Try it with and without the cover = attached.
If I had a IV I would attach that cover with = many screws=20 and keep them tight.
This does not work on the small tail 360, the = resonant=20 frequency is too high.


Regards,
Bill Hannahan

Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try=20 it now. ------=_NextPart_000_00FF_01C8A88F.A2E18EE0--