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Date: Thu, 05 Feb 2009 13:43:57 -0500
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From: "Rick Lafford" <gliderguy89@earthlink.net>
Subject: RE: [LML] Re: springs on rudder pedals
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Importance: Normal

I've been flying aircraft with this type of cable set-up since 1978 and can
say that we never lubricate the cables. Stainless cable inside the HDPE
tubing without lube. Never had a problem with sticky cables unless someone
decided to lube where they passed though the 'S' tubes on the rudder pedals.

Regarding spring on the rudder pedals. For some designs, these springs are
one component in the anti-flutter equation. Don't know about the Lancairs
but something to consider.

Rick (Legacy someday RV-6 N146RV today)

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net]On Behalf Of
Greenbacks, UnLtd.
Sent: Wednesday, February 04, 2009 7:05 PM
To: lml@lancaironline.net
Subject: [LML] Re: springs on rudder pedals

Before you take the plunge, carefully consider the possible
consequences of lubricating rudder cables with PTFE powder. I obtained
some teflon directly from Dupont and at the suggestion of one of their
chemical engineers, I thoroughly cleaned my cables with MCL. Then made
a slurry of teflon powder and isopropol alcohol, coated the cables and
let them dry. When inserted into the nylaflow tubing, they and the
rudder moved with almost no resistance and I was very proud of my
ingenuity.
Fast forward, (I'd be embarrassed to say how long) to final rudder
pedal installation. The cables would only move with substantial force,
they almost seemed frozen in place. With great difficulty, I managed
to pull them out of the nylaflow tubing and they looked as though they
were caked in dried cow dung. To make matters even worse, all four
nylaflow tubes had this crud over their entire length.
To make a long story short, the cables and tubes are clean and work
just fine, buyer beware...

Angier Ames
N4ZQ...soon
N3ZQ...not as soon

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