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larry(at)macsmachine.com
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 Posted: Tue Jul 01, 2008 4:10 pm Post subject: Cable Tension |
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Hi Bobby,
I may catch a bit of flack, but the cable settings in the 601 series,
even though specs say 32, you'll find that a bit high after several
years because the
structure will keep giving and stretching. I'd recommend you hold it to
between 20 and 25 lbs to avoid the unnecessary wear on the rudder pivot
bearings and
bending at the bellcrank mounts. It won't change the way your aircraft
flies at all.
Larry McFarland 601HDS at www.macsmachine.com
BobbyPaulk(at)comcast.net wrote:
| Quote: |
to all
we have started our first "Conditional" inspections on our 601 XL's.
for those interested the cable tension dropped from 32 lbs. to about 16 ~17 lbs on our 2 aircraft in the first year of operation. both elevator and aileron. the rudder also dropped about half but we had them set at 25 Lbs.
the outside temperature was about the same. i attribute the drop to the cable stretching, fittings seating, and a little wear. One aircraft has 49+ hrs and one has 65+ hrs. we documented the original tension at 32#. we just reset the tension with the same Tensiometer back to 32 lbs for both aircraft. be sure to put it on your check list.
Bobby Paulk
N131BP
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klaus(at)utdallas.edu
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| Posted: Sun Jul 06, 2008 5:22 am Post subject: Cable tension |
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Hi,
In a recent message it was reported that retensioning of cables was
necessary after one year. That is odd and should not happen.
For the rudder cables of the tricycle versions,
such retensioning should be done with caution. The reason is the bungee
chord of the nosegear.
When the plane is on the ground, then the nosegear pushes up the bungee
and thus the tubes to which the the steering rods are attached,
are not at the stop.
Now the tension of the rudder cables is maximum when these tubes are
at the stop, and full tension is
imposed only when the plane is in the air. This fact mandates that the
tension of rudder cables is measured only when the nosegear is unloaded,
say using a jack,
and thus the situation in flight is simulated. Otherwise the cable
tension in flight may be excessive.
As for my plane, after 12 years, we have never retensioned the cables.
Happy flying,
Klaus
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