Saturday 26 July 2008

25th July 2008 - Rudder cables and return springs

Installed 6 guides for the rudder cables (three each side). I'm using the ACS guides that come in two halves with an outside diameter of 3/4". These fit into 1/2" lengths of 7/8" tubing (0.058" wall) that were welded into the fuselage frame. I've placed the guides in the corner of the floor and side at the front of the door, in the corner of the floor and side at the rear of the seats, and 3" up the internal diagonals that support the elevator push rod. You can see the first pair of guides in the picture. In addition I will use plastic brake tube installed in 5/16" * 0.028 tubing to guide the cables through the fuselage sides in front of the rudder - just waiting for the 5/16" tubing to arrive to finish this.

I've decided to install return springs on the rudder pedals to apply some gentle tension to the rudder cables and avoid the pedals falling forward. These were installed by welding small loops of 1/8" steel rod to the front of the rudder lever arms and the firewall sides. The springs are the ACS 4-1/2" rudder return springs originally intended for the Vari-eze.

The cables were then fabricated using 1/8" cable and nico-press fittings. These were attached to the rudder lever arms using 4 short lengths of 0.050" 4130 plate drilled for 3/16" bolts. The same approach will be used at the rear of the aircraft to attach to the rudder with the spacing of the holes in the plates drilled to exactly centre both the rudder pedals and rudder
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