X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 27 Apr 2009 19:51:31 -0400 Message-ID: X-Original-Return-Path: Received: from web83901.mail.sp1.yahoo.com ([69.147.92.97] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with SMTP id 3598743 for lml@lancaironline.net; Mon, 27 Apr 2009 18:27:01 -0400 Received-SPF: neutral receiver=logan.com; client-ip=69.147.92.97; envelope-from=paulhershorin@bellsouth.net Received: (qmail 73423 invoked by uid 60001); 27 Apr 2009 22:26:25 -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=c24WQ2AAfAVGqzATCe/DRlDlGlo3YI65TEAcQbvW2q1VW+YWIEMsrJ+OAvQk7AE9X7myW2F2whqCr0jemJ8+WuBtd1FjjV20IVALQvt1ppqPZH3gVrQaD8HqQ0I3KK8qWed+D9kbtulZSD268DgiPThGSiwbfFvjg5kZRa1X0r0=; X-Original-Message-ID: <15761.68281.qm@web83901.mail.sp1.yahoo.com> X-YMail-OSG: 9ju7g_sVM1kpFuD2_gOtlj25ZiPd4nJzTvGjgqn9MxhE7yiIWslB1wOZbcd4F26Wel_kZARIYVb.VEfkAjmGtsdEi23xJTO.NM_PcTPDbLZEEklhqsxpVZkrPOjNxXbMx.C5dCElu90ugwAS1c4ycrQWl7aqhQC4fruQN2.viBLLMXMp2KLxsIQK6J8vHHmH4Q3_pXSeFwUr6QA4YJf73fH5nktW5t7KkTFhDgOSq8GRydoM0l2AXznZXZeP4ibfrflm.E9zClupGgE3MjJiED74JCm8R75uDD.WUu7xthRy4EtqJHAAf.ymsJ762F1kJtYhhpvn6WnwrDFvHugqNKyRWzz_ys5xYg-- Received: from [98.77.136.237] by web83901.mail.sp1.yahoo.com via HTTP; Mon, 27 Apr 2009 15:26:24 PDT X-Mailer: YahooMailRC/1277.35 YahooMailWebService/0.7.289.1 References: X-Original-Date: Mon, 27 Apr 2009 15:26:24 -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="0-1259310734-1240871184=:68281" --0-1259310734-1240871184=:68281 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Tungsten--this is correct.=0APaul=0A=0A=0A=0A=0A___________________________= _____=0AFrom: terrence o'neill =0ATo: lml@lancaironli= ne.net=0ASent: Sunday, April 26, 2009 9:23:01 AM=0ASubject: [LML] Re: Balan= cing MkII Elevators=0A=0A=0APaul,=0ADo you mean tungsten powder?=0AI used t= hat with epoxy to rebalance my elevators after adding trim=A0tabs on both s= ides.=A0=A0I made=A0little half-teardrops under each forward segment of the= elevator.=0AI don't recall how I found them, but the two bags of sample po= wder are from Teledyne Wah Chang (google it).=A0 This was about four years = ago, so=A0I don't know if they still offer the tungsten powder.=A0 If I rec= all, it is a little more dense than uranium.=A0 Mixed nicely with epoxy and= cast.=0ATerrence=0AL235/320 N211AL=0A----- Original Message ----- =0AFrom:= PAUL HERSHORIN =0ATo: lml@lancaironline.net =0ASent: Friday, April 24, 200= 9 22:11=0ASubject: [LML] Re: Balancing MkII Elevators=0A=0AI used tunson in= powder form--heaver then lead--mixes with resin very well--scrap recycle p= laces have it.=0APaul Hershorin=0A360--471LA=0A=0A=0A=0A=0A________________= ________________=0AFrom: "Sky2high@aol.com" =0ATo: lml@la= ncaironline.net=0ASent: Thursday, April 23, 2009 8:40:51 PM=0ASubject: [LML= ] Re: Balancing MkII Elevators=0A=0ARob, et al,=0A=0AYep and a certain aile= ron that contains=A0a trim tab and actuator require even more balance weigh= t.=0A=A0=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 those lead hal= f-rounds going nearly full-span (two of them, flat surface toflat surface).= =A0 But let's stop to think about it.=A0 We need as much "moment"=A0(mass x= distance) in front of the hinge line as behind it.=A0 In practice, we have= more weight (balance weight) forward of the hinge line than we do behind i= t (the control surface itself) since the CG of the control surface is gener= ally much further behind the hinge line than the balance weights are forwar= d of it.=A0 This is certainly the case with the ailerons, but less so for t= he rudder and elevators, since they have those forward overhangs for aerody= namic balance.=0A=0AFor preliminary design purposes, my airplane design gro= up assumes that the balance weights weigh 1.5 times the weight of the contr= ol surface alone.=0A=0ABottom line -- your balance weights need to be at le= ast as heavy as the control surface, and up to 50% more.=0A=0AYup, it's a l= ot.=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 and Desktops!=0A=0AN= o virus found in this incoming message=0AChecked by PC Tools AntiVirus (5.0= .0.22 - 10.100.057).=0Ahttp://www.pctools.com/free-antivirus/=0A=0A=0ANo vi= rus found in this outgoing message=0AChecked by PC Tools AntiVirus (5.0.0.2= 2 - 10.100.057).=0Ahttp://www.pctools.com/free-antivirus/=0A --0-1259310734-1240871184=:68281 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Tungsten--this is correct.
=0A
Paul
=0A

=0A=0A
=0AFrom: terrence o'neill <troneill@charter.ne= t>
To: lml@lancaironl= ine.net
Sent: Sunday, Ap= ril 26, 2009 9:23:01 AM
Subject: [LML] Re: Balancing MkII Elevators

=0A=0A=0A
Paul,
=0A
Do you mean tungsten powder?
=0A
I used that with epoxy to reba= lance my elevators after adding trim tabs on both sides.  I = made little half-teardrops under each forward segment of the elevator.=
=0A
I don'= t recall how I found them, but the two bags of sample powder are from Teled= yne Wah Chang (google it).  This was about four years ago, so I d= on't know if they still offer the tungsten powder.  If I recall, it is= a little more dense than uranium.  Mixed nicely with epoxy and cast.<= /FONT>
=0A
Terrenc= e
=0A
L235/= 320 N211AL
=0A
=0A
----- Original Message -----
= =0A=0A=0A
Sent: F= riday, April 24, 2009 22:11
=0A
Subj= ect: [LML] Re: Balancing MkII Elevators
=0A

=0A
=0AI used tunson in powder form--heaver then lead--mixes with resin very wel= l--scrap recycle places have it.
=0A
Paul Hershorin
=0A
3= 60--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: [LM= L] Re: Balancing MkII Elevators

=0A
Rob, et al,
=0A
 =0A
Yep and a certain aileron that contains a trim tab and act= uator require even more balance weight.
=0A
 
=0A
Grayhawk
=0A
 =0A
=0A
In a message dated 4/22/2009 8:27:23 A.M. Central Daylig= ht Time, rwolf99@aol.com writes:
=0A
I, too, was s= urprised at how much lead I needed to balance my 360 ailerons.  In fac= t, I have those lead half-rounds going nearly full-span (two of them, flat = surface toflat surface).  But let's stop to think about it.  We n= eed as much "moment" (mass x distance) in front of the hinge line as b= ehind it.  In practice, we have more weight (balance weight) forward o= f the hinge line than we do behind it (the control surface itself) since th= e CG of the control surface is generally much further behind the hinge line= than the balance weights are forward of it.  This is certainly the ca= se with the ailerons, but less so for the rudder and elevators, since they = have those forward overhangs for aerodynamic balance.

For preliminar= y 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>


No virus found in this incoming message
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