X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 26 Jul 2005 10:48:32 -0400 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.14.236.16] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTPS id 614426 for lml@lancaironline.net; Mon, 25 Jul 2005 12:07:19 -0400 Received-SPF: none receiver=logan.com; client-ip=68.14.236.16; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.4/8.13.4/Debian-1) with SMTP id j6PG6Yb1011253 for ; Mon, 25 Jul 2005 09:06:34 -0700 X-Original-Message-ID: <014c01c59132$8c9d2b70$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: Counterbalance X-Original-Date: Mon, 25 Jul 2005 09:04:29 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0149_01C590F7.DD161160" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 This is a multi-part message in MIME format. ------=_NextPart_000_0149_01C590F7.DD161160 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Counterbalancing the rudder. "The key here is not that we're trying to = make the nose of the surface hang downwards (well, we are, but gravity = is not the issue), but rather than we're trying to move it's inertia = (it's center of mass) to be forward of the hinge line, so deflections of = the structure to which it's attached make the surface move to generate = aerodynamic forces which DECREASE the load which made the structure = deflect in the first place. It's the same for a wing/aileron, a = stabilizer/elevator, or a fin/rudder. We just use gravity to help us = measure where the center of mass is. It doesn't matter whether the = surface is used horizontally (ailerons and elevators), vertically = (rudders), or otherwise (ruddervators on a Bonanza, for example). As an = exercise to the curious, why don't we balance flaps? - Rob Wolf" This makes since and makes me ask the same question I asked myself a = week ago. Wouldn't it be more affective to preload springs at the top = and/or the bottom of the rudder so as to increase the spring load in the = opposite direction of rudder movement and reduce the other spring's load = in the same direction as the rudder's direction of movement? However, = this would adversely affect rudder pedal feel/load. I'm going to = install the weight, but the thought process is interesting. Craig Berland ------=_NextPart_000_0149_01C590F7.DD161160 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Counterbalancing the rudder. "The key here is not that we're = trying to=20 make the nose of the surface hang downwards (well, we are, but gravity = is not=20 the issue), but rather than we're trying to move it's inertia (it's = center of=20 mass) to be forward of the hinge line, so deflections of the structure = to which=20 it's attached make the surface move to generate aerodynamic forces which = DECREASE the load which made the structure deflect in the first = place. =20 It's the same for a wing/aileron, a stabilizer/elevator, or a = fin/rudder. =20 We just use gravity to help us measure where the center of mass = is.  It=20 doesn't matter whether the surface is used horizontally (ailerons and=20 elevators), vertically (rudders), or otherwise (ruddervators on a = Bonanza, for=20 example). As an exercise to the curious, why don't we balance = flaps?
- Rob Wolf"
 
This makes since and makes me ask the same question I asked myself = a week=20 ago. Wouldn't it be more affective to preload springs at the top and/or = the=20 bottom of the rudder so as to increase the spring load in the opposite = direction=20 of rudder movement and reduce the other spring's load in the same = direction as=20 the rudder's direction of movement? However, this would adversely affect = rudder=20 pedal feel/load.  I'm going to install the weight, but the thought = process=20 is interesting.
Craig Berland
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