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Date: Tue, 28 Apr 2009 10:00:48 -0400
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From: "Doug Baleshta" <dbaleshta@tru.ca>
Subject: Re: [LML] Re: Balancing MkII Elevators
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I also used tungsten from TIG welding rods.  Some of them are fairly pure, =
they layed in nicely with expoy/flox.  Careful with the rods though, some =
of them have small amounts of radioactive material, you might just get =
someone's  interest  the next time you land at an airport ;-)

Doug

>>> PAUL HERSHORIN <paulhershorin@bellsouth.net> 04/27/09 4:52 PM >>>
Tungsten--this is correct.
Paul


________________________________
From: terrence o'neill <troneill@charter.net>
To: lml@lancaironline.net
Sent: Sunday, April 26, 2009 9:23:01 AM
Subject: [LML] Re: Balancing MkII Elevators


Paul,
Do you mean tungsten powder?
I used that with epoxy to rebalance my elevators after adding trim tabs on =
both sides.  I made little half-teardrops under each forward segment of =
the elevator.
I don't recall how I found them, but the two bags of sample powder are =
from Teledyne Wah Chang (google it).  This was about four years ago, so I =
don'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.
Terrence
L235/320 N211AL
----- Original Message -----=20
From: PAUL HERSHORIN=20
To: lml@lancaironline.net=20
Sent: Friday, April 24, 2009 22:11
Subject: [LML] Re: Balancing MkII Elevators

I used tunson in powder form--heaver then lead--mixes with resin very =
well--scrap recycle places have it.
Paul Hershorin
360--471LA


________________________________
From: "Sky2high@aol.com" <Sky2high@aol.com>
To: lml@lancaironline.net
Sent: Thursday, April 23, 2009 8:40:51 PM
Subject: [LML] Re: Balancing MkII Elevators

Rob, et al,

Yep and a certain aileron that contains a trim tab and actuator require =
even more balance weight.
=20
Grayhawk

In a message dated 4/22/2009 8:27:23 A.M. Central Daylight Time, rwolf99@ao=
l.com writes:
I, too, was surprised at how much lead I needed to balance my 360 =
ailerons.  In fact, 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 need as much "moment" (mass x distance) in front of the hinge line =
as behind it.  In practice, 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 surface is generally much further behind the hinge =
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 preliminary 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 least as heavy as the =
control surface, and up to 50% more.

Yup, it's a lot.

- Rob Wolf=20


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