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RV-List Digest: 2 Msgs - 04/17/11

 
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f1boss(at)gmail.com
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PostPosted: Mon Apr 18, 2011 4:45 am    Post subject: RV-List Digest: 2 Msgs - 04/17/11 Reply with quote

Quote:
________________________________ �Message 1 �_____________________________________


Time: 03:26:28 PM PST US
From: Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)>
Subject: "Worn Out" CT-Q67 Cable Assembly (Warning!)


Dear Listers,

At 170 hours on my RV-8 now, the Prop control had become increasing more difficult
to move starting around 100 hours. �The Mixture and Throttle have worked fine
and continue to. �All three controls use the standard "Green" control cables
from Vans, typically a "CT-Qxx" part.

A couple of weeks ago, I disassembled the Governor end of the assembly and made
sure that there was no binding or issues on that end. �I even lightly lubed up
the various moving bits. �Yesterday, the Prop control became so difficult to
move that I had trouble cycling the prop during run up. �I pulled the whole throttle
quadrant installation apart today to have a look. �I got the cable completely
out of the airplane and there are NO outward signs of wear or abuse of
*any kind*. �But even with the cable completely out of the plane and nothing
connected to either end, it is almost impossible to move the cable!! �I have a
new CT-Q67 cable assembly for my front-mounted governor installation and I'm
going to install that next.

But, I wanted to give everyone a heads up on these CT-Q controls. �These things
are built like they go on a Caterpillar Tractor, so I can't figure out why they
would wear out like this.

If one of these controls starts getting stiff and tight, its probably not going
to get any better. �Replace it before it becomes a safety issue! �Not a big deal
on the Prop control, but on a throttle or mixture it could be a serious concern.

Best regards,

Matt

-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours Total Time Since May 2 2010 Test Flight!



Hey Fellas:

I have seen this too many times - looks like heat is the killer. Move the cables away from the killer exh system, then you can wrap the cables with spark plug wire insulation - - a smaller version of the normal hose type heat protective stuff. Lube will not work, as the nylon inner wrap is balled around the wire - hanging on for dear life! If this persists, you can try the 920 cables from ACS, or buy replacement cables from Cablecraft - certified stuff, thus very expensive.

Carry on!
Mark
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