The Murphy Builders Site

I'm installing fairleads and generally trying to work out the cable routing through the tailcone. I'm assuming it is a bad idea to have the rudder cables approach the attach point on the rudder at an angle, unless it is very slight since if approaching from slightly below the cables would pull downward on the rudder horns as well as forward and might cause them to bend. Anybody have any opinions on how much of an angle is too much? None at all? If you shouldn't have any angle it appears as if you must drill holes through the forward tailwheel attach bracket plate that goes from one side of the rearmost tailcone area to the other. &%$#! I sure wish the manual would have told me that before I installed it! Gonna be very difficult to drill now.

On a previous subject, I tried drilling out the cable bushings from 3/16 to a 1/4. Worked, but marred the outer part of the bushing from being clamped in a vise to drill. Not sure if that might be bad for the cable. Also concerned with the extremely tight angle the cable has to be bent to go around the small bushing. You can see the cable strands separating as you bend it around. Must be OK since this is the correct bushing for 1/8 cable. I guess you just slide the ferrel up as close as you can get it and swage in place. Gonna take two people to do this properly. I'm still thinking about just using thimbles instead. I wonder if the attach points on the rudder and the elevator were supposed to be 3/16 despite the manual telling me to drill out to 1/4? 3/16 bolt would probably be plenty strong enough for that purpose.

Mike Kimball
SR#044



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Phil and Ted,
I ran the rudder cables through the nylon/delrin blocks that came with the
kit and added a few extra. The elevator cables were a different story. I
used a pulley on the cable at the top of the push tube bellcrank to bring
it down to floor level. I've never noticed any stiffness in the rudder until
the other day when I flew a friends 172 and his rudder is much easier to
push than mine. This is not a complaint, but do whatever you can do to
eliminate friction.
Al
Moose N526AP
----- Original Message -----
From: "Phillip Bohn" <philbohn@ameritech.net>
To: <murphy-rebel@dcsol.com>
Sent: Wednesday, December 10, 2003 11:11 AM
Subject: Rudder cable routing

We are running the rudder cables through the floor of the fuselage. In

the bay that contains the end of the elevator push-pull tube the angle of
the cable run changes significantly. We haven't found any pix of this area
to show how that transition is being handled. We anticipate needing a
pulley for each cable. Would like to know how it was done by the builders
up to now.

thanx,

Phil & Ted
SR3500

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We are running the rudder cables through the floor of the fuselage. In the bay that contains the end of the elevator push-pull tube the angle of the cable run changes significantly. We haven't found any pix of this area to show how that transition is being handled. We anticipate needing a pulley for each cable. Would like to know how it was done by the builders up to now.
thanx,

Phil & Ted
SR3500



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We added pulleys for the rudder cables and the flap cable. Just uploaded a
picture to S-59 of archives showing same. We ran the flap cable along side
the right rudder cable. Picture doesn't show it but there is a hole for a
cotter pin cable guide. We used a pulley forward on the flap cable to bring
it over next to the right rudder cable. (Uploaded a picture of that too).
We used pulleys at every angle change and eventually brought the rudder
cables out parallel to the rudder arm.

Another way I have seen the flap cable run is straight back and goes right
through the center of the elevator bell crank to a pulley co-located with
pulleys for the elevator cables.

We also installed pulleys on the bulkhead aft of the elevator bell crank for
the elevator cables. The bottom elevator cable doesn't really need one as
it runs fairly parallel to the floor, but was nice to bring the top cable
down to run next to it and then all up the tail cone at the same angle.


You may already have heard this one, but most I know are now moving the
forward rudder pulleys to the inside of the firewall. Less holes in
firewall don't need to make covers.

Scott
Moose 174

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
Phillip Bohn
Sent: Wednesday, December 10, 2003 12:12 PM
To: murphy-rebel@dcsol.com
Subject: Rudder cable routing


We are running the rudder cables through the floor of the fuselage. In the
bay that contains the end of the elevator push-pull tube the angle of the
cable run changes significantly. We haven't found any pix of this area to
show how that transition is being handled. We anticipate needing a pulley
for each cable. Would like to know how it was done by the builders up to
now.
thanx,

Phil & Ted
SR3500



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