pj.ladd(at)btinternet.com
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 Posted: Thu Nov 30, 2006 5:55 am Post subject: cables |
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re the couple of posts about rudder/elevator cables parting.
I have never heard of elevator cables giving way but I do remember one instance where the rudder cables did not give way but the horn on one side of the rudder was torn off.
I think that this is due to the fact that we unconsciously rest our feet on the rudder pedals and keep the cables under constant tension. If we hit a patch of turbulence or there is a concentrated bit of flying we often brace ouselves in the cockpit against the pedals too.
Also I think that ultralight designers tend to specify small diameter pulleys which means very sharp bends for the cables. Unfortunately thicker cables only exacerbate the problem as the outside edge of the cable tends to be stretched while the inside is compressed. I am generally in favor of thicker cables but straightening the cable run.
I was always worried by the cable runs in my Challenger which were very sharp, 90 degrees, the pulleys small, and the cables were worryingly thin. I kept them well oiled and checked them for `spikes` on every flight. They in fact never gave any trouble and I came to the conclusion that it was the small diameter of the cable which was the saving grace.
Cheers
Pat
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