X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 24 Apr 2009 23:11:22 -0400 Message-ID: X-Original-Return-Path: Received: from web83910.mail.sp1.yahoo.com ([69.147.92.115] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with SMTP id 3595643 for lml@lancaironline.net; Fri, 24 Apr 2009 14:19:34 -0400 Received-SPF: neutral receiver=logan.com; client-ip=69.147.92.115; envelope-from=paulhershorin@bellsouth.net Received: (qmail 67254 invoked by uid 60001); 24 Apr 2009 18:19:01 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=bellsouth.net; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=Fy78K44DohmbWNgPyqJ+M0RTn5i14rgrYNAcr6XZRsWp5oxX71vETjI/VcGtaLzQbtCRUTFzN75lEmWXqk4h7Iur/lgFSGmbixKvWB481wOCdhM+tPS2wVcDBmniXWC/HuyiyKOVWF66d6pxL/8o45A/LdnPEPVQkcKQCbfWQN0=; X-Original-Message-ID: <440929.67201.qm@web83910.mail.sp1.yahoo.com> X-YMail-OSG: eWi6bEoVM1mqjJpEcfzlQYrKTD86fKtFGylOz0jxA846ucqpylQauumZU6GfSutS2gcCj9R6YXzavwc4Vjsb4f6s6WTj_G.TZ0GHy8nKV6IZBI0embtbnU4X5ykGjCKQaqG5YUSwe36WotFQ8gntg1qt7vF_l_aco6Zhzw5d5i.ZRjM19D4gP_UJZJDCwdShN6tl9ZNa6wCe6BkY3E2PIaLhhiQ7U0nqfGQYKMAjK_BqMz4Icp_tLn7tKIa.byDDBdOVhLFOKBY0YFRLqSx1_f1ibwrbNmPuhHOdrMdt7vbG7g2yF6W102zt7jkLCIR19.skVjS29sLPZU7InWHo9qI1g190jrDllg-- Received: from [98.77.136.237] by web83910.mail.sp1.yahoo.com via HTTP; Fri, 24 Apr 2009 11:19:00 PDT X-Mailer: YahooMailRC/1277.35 YahooMailWebService/0.7.289.1 References: X-Original-Date: Fri, 24 Apr 2009 11:19:00 -0700 (PDT) From: PAUL HERSHORIN Subject: Re: [LML] Re: Balancing MkII Elevators X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1432669078-1240597140=:67201" --0-1432669078-1240597140=:67201 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I used tunson in powder form--heaver then lead--mixes with resin very well-= -scrap recycle places have it.=0APaul Hershorin=0A360--471LA=0A=0A=0A=0A=0A= ________________________________=0AFrom: "Sky2high@aol.com" =0ATo: lml@lancaironline.net=0ASent: Thursday, April 23, 2009 8:40:51 PM= =0ASubject: [LML] Re: Balancing MkII Elevators=0A=0ARob, et al,=0A=0AYep an= d a certain aileron that contains=A0a trim tab and actuator require even mo= re balance weight.=0A=0AGrayhawk=0A=0AIn a message dated 4/22/2009 8:27:23 = A.M. Central Daylight Time, rwolf99@aol.com writes:=0AI, too, was surprised= at how much lead I needed to balance my 360 ailerons.=A0 In fact, I have t= hose lead half-rounds going nearly full-span (two of them, flat surface to = flat surface).=A0 But let's stop to think about it.=A0 We need as much "mom= ent"=A0(mass x distance) in front of the hinge line as behind it.=A0 In pra= ctice, we have more weight (balance weight) forward of the hinge line than = we do behind it (the control surface itself) since the CG of the control su= rface is generally much further behind the hinge line than the balance weig= hts are forward of it.=A0 This is certainly the case with the ailerons, but= less so for the rudder and elevators, since they have those forward overha= ngs for aerodynamic balance.=0A=0AFor preliminary design purposes, my airpl= ane design group assumes that the balance weights weigh 1.5 times the weigh= t of the control surface alone.=0A=0ABottom line -- your balance weights ne= ed to be at least as heavy as the control surface, and up to 50% more.=0A= =0AYup, it's a lot.=0A=0A- Rob Wolf =0A=0A=0A______________________________= __=0AThe Average US Credit Score is 692. See Yours in Just 2 Easy Steps! = =0A=0A________________________________=0ABig savings on Dell XPS Laptops an= d Desktops! --0-1432669078-1240597140=:67201 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
I used tunson in powder form--heaver then lead--mixes with resin = very well--scrap recycle places have it.
=0A
Paul Hershorin
= =0A
360--471LA
=0A

=0A
=0A
=0AFrom: "= Sky2high@aol.com" <Sky2high@aol.com>
To: lml@lancaironline.net
Sent: Thursday, April 23, 2009 8:40:51 PM
Subject: [LML] Re: Balancing MkII El= evators

=0A
Rob, et al,
=0A
 
=0A
Yep and a ce= rtain aileron that contains a trim tab and actuator require even more = balance weight.
=0A
 
=0A
Grayhawk
=0A
&nbs= p;
=0A
=0A
In a message dated 4/22/2009 8:27:23 A.M. Central D= aylight Time, rwolf99@aol.com writes:
=0A
I, too, = was surprised at how much lead I needed to balance my 360 ailerons.  I= n fact, I have those lead half-rounds going nearly full-span (two of them, = flat surface to flat surface).  But let's stop to think about it. = ; We need as much "moment" (mass x distance) in front of the hinge lin= e as behind it.  In practice, we have more weight (balance weight) for= ward of the hinge line than we do behind it (the control surface itself) si= nce the CG of the control surface is generally much further behind the hing= e line than the balance weights are forward of it.  This is certainly = the case with the ailerons, but less so for the rudder and elevators, since= they have those forward overhangs for aerodynamic balance.

For prel= iminary design purposes, my airplane design group assumes that the balance weights weigh 1.5 times the weight of the control= surface alone.

Bottom line -- your balance weights need to be at le= ast as heavy as the control surface, and up to 50% more.

Yup, it's a= lot.

- Rob Wolf =0A

=0A
=0ABig savings on Dell XPS Laptops and Desktops!<= /FONT>
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