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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 -----
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.
Grayhawk
In a message dated 4/22/2009 8:27:23 A.M. Central Daylight Time,
rwolf99@aol.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
Big savings on Dell XPS Laptops and
Desktops!
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