X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 26 Feb 2012 16:42:35 -0500 Message-ID: X-Original-Return-Path: Received: from nm5-vm0.access.bullet.mail.mud.yahoo.com ([66.94.237.155] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with SMTP id 5415140 for lml@lancaironline.net; Sat, 25 Feb 2012 11:50:14 -0500 Received-SPF: neutral receiver=logan.com; client-ip=66.94.237.155; envelope-from=browncc1@verizon.net Received: from [66.94.237.126] by nm5.access.bullet.mail.mud.yahoo.com with NNFMP; 25 Feb 2012 16:49:38 -0000 Received: from [66.94.237.110] by tm1.access.bullet.mail.mud.yahoo.com with NNFMP; 25 Feb 2012 16:49:38 -0000 Received: from [127.0.0.1] by omp1015.access.mail.mud.yahoo.com with NNFMP; 25 Feb 2012 16:49:38 -0000 X-Yahoo-Newman-Id: 642536.45073.bm@omp1015.access.mail.mud.yahoo.com Received: (qmail 47475 invoked from network); 25 Feb 2012 16:49:38 -0000 X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: rBfhjooVM1n7M2wdoPkDzyRbzsD7klf6z6TZUkTAgI_5SZQ _K_feqxznOTrt4rTdn5B.RzkYm581vrQPB0tcX8YBpShcaZCF7a.g4dJzSm7 atYSxC1fG39uq9iMPrxSsfOC1nh8iBang.sxV_r0pQBILDpgcHOkAwEptU02 C_8WQKviHHb8WLgItoA4xtCtpF_mCV7cgONs4B9QfjkA2.rl3j3b2Mn_EWqN SUItfAD9VeywH6MISfajIzDsv.Cm2Ic_cRkrZIEExULSP0tnau3k5aYOudqb 4YFkiC4Z6LRAoUHwrtXL87KQFDp2arXhl6HCYrIou1MTPGz9ouKIx0BrXm8A HJJsKWjtfuqTZtw_dPFFre8vrW5CtoYoTGj.fdwK9D_pJR4epubWHugGf3Bi WnN6PM5y3u1Pd_LUVodwRXXYiC_V9fvrgscOCOrGHNRA7bXi8T8IM0tPMCpJ _o3qg1ws5vMo- X-Yahoo-SMTP: F49l9g6swBC0R9n8vJIbm7Tf3P8Xlmia8rHIwTlO__Ml Received: from chass-imac-2.home (browncc1@72.64.81.165 with plain) by smtp103.vzn.mail.bf1.yahoo.com with SMTP; 25 Feb 2012 08:49:37 -0800 PST From: Charles Brown Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-14--305941042 Subject: Re: [LML] rudder balance X-Original-Date: Sat, 25 Feb 2012 10:49:37 -0600 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <67FA5F00-02DF-4B1B-83D7-B846CA4FBB4D@verizon.net> X-Mailer: Apple Mail (2.1084) --Apple-Mail-14--305941042 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 The Legacy has no lead anywhere on the rudder (or elevators) other than = the counterbalance horns. You're right, it would be almost ineffective = in the leading edge, being such a short distance ahead of the hinge. = Reaching for a way-out example, I recall that the 737-300 in flight test = actually busted off both horns from the elevators, but the elevators = stayed on. They did *not* cure that by putting weight in the leading = edges between the hinges! In a *very* perfect world, the weight would be distributed all along the = leading edge and there would be no counterbalance horn. That would = eliminate torsional stresses if the rudder ever started buzzing. But = this is also a way-far-out consideration, don't even think about it. My Legacy manual says for the rudder: =20 "1. Fit the rudder counterweight as far forward as possible. Some = trimming of the counterweight may be necessary." "2. Measure the weight of the rudder counterweight. It should weigh = 3.0 lbs or 1362 grams. Trim as necessary." Of course I assume that the dimensions and mass properties of the Legacy = rudder are NOT identical to the 360. I don't see how you can miss by = mounting the rudder sideways (horizontally, rather than vertically) on = hinge pins and balancing it with lead in the horn. Another 4-5 lb of = lead sounds like an awful lot. Charley Brown Legacy #299 PS -- My airplane's at Grand Prairie, you're welcome to come by and have = a look. On Feb 24, 2012, at 3:36 PM, Ed Gray wrote: I=92m almost done with my L 360. The manual calls for 2 lbs. of lead = weights on the leading edge of the rudder and enuf additional weight on = the counterbalance horn to put the rudder in balance. The weights on = the leading edge are only one inch ahead of the hinge line, thus very = ineffective as balance. The horn still needs 4-5 lbs of lead to = balance. The lead on the leading edge between hinges seems to be dead = weight to me=85Lancair guys say =93follow the book=94. I think all lead = should be in the horn, as far from the hinge line as possible. Is there = some mechanical reason to put lead on the leading edge between the = hinges? The Legacy does not seem to have lead there, does it? Legacy = instructions say =93put additional weight in the horn near the factory = weight=94 , how much weight is the factory quickbuild ? =20 Thanks for help on these issues. The factory guys barely remember the = 320-360 series. =20 Ed Gray , Dallas L360, Superior IO 360, Dynon Skyview and txpd, Garmin = SL 30, 214 734 2524 --Apple-Mail-14--305941042 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252
The Legacy has no lead anywhere on the rudder = (or elevators) other than the counterbalance horns.  You're right, = it would be almost ineffective in the leading edge, being such a short = distance ahead of the hinge.  Reaching for a way-out example, I = recall that the 737-300 in flight test actually busted off both horns = from the elevators, but the elevators stayed on.  They did *not* = cure that by putting weight in the leading edges between the = hinges!

In a *very* perfect world, the weight = would be distributed all along the leading edge and there would be no = counterbalance horn.  That would eliminate torsional stresses if = the rudder ever started buzzing.  But this is also a way-far-out = consideration, don't even think about it.

My = Legacy manual says for the rudder:  
"1.  Fit the = rudder counterweight as far forward as possible.  Some trimming of = the counterweight may be necessary."
"2.  Measure the = weight of the rudder counterweight.  It should weigh 3.0 lbs or = 1362 grams.  Trim as necessary."

Of course = I assume that the dimensions and mass properties of the Legacy rudder = are NOT identical to the 360.  I don't see how you can miss by = mounting the rudder sideways (horizontally, rather than vertically) on = hinge pins and balancing it with lead in the horn.  Another 4-5 lb = of lead sounds like an awful lot.

Charley = Brown
Legacy #299

PS -- My airplane's = at Grand Prairie, you're welcome to come by and have a = look.


On Feb 24, 2012, at 3:36 PM, Ed = Gray wrote:

I=92m almost = done with my L 360.   The manual calls for 2 lbs. of lead = weights on the leading edge of the rudder and enuf additional weight on = the counterbalance horn to put the rudder in balance.   = The  weights on the leading edge are only one inch ahead of the = hinge line, thus very ineffective as balance.  The horn still needs = 4-5 lbs of lead to balance.   The lead on the leading edge = between hinges seems to be dead weight to me=85Lancair guys say =93follow = the book=94. I think all lead should be in the horn, as far from the = hinge line as possible.  Is there some mechanical reason to put = lead on the leading edge between the hinges?  The Legacy does not = seem to have lead there, does it? Legacy instructions say =93put = additional weight in the horn near the factory weight=94 , how much = weight is the factory quickbuild ?
Thanks for help = on these issues.  The factory guys barely remember the 320-360 = series.
 
Ed Gray , Dallas  L360, Superior IO 360, Dynon Skyview and = txpd, Garmin SL 30, 214 734 = 2524

= --Apple-Mail-14--305941042--