larry(at)macsmachine.com
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 Posted: Sun Aug 10, 2008 9:39 am Post subject: [Probable Spam] Aeleron (sp?) Push Rod Question/ CH601XL |
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Hi John,
Cables are essentially dirt simple and ideal for the Zenith aircraft.
Push tubes are fine for rigid structures within a fuselage, but
where there is structural deflection, push tubes can self-destruct in
vibration if the sizing is not balanced and can work ineffectively
against a deflected geometry. Never have seen a cable doing this or
becoming bound in travel with other components.
One has to be very careful going with arbitrary changes from cable to
push tubes or rods.
I have cables tensioned 20 to 25 lbs and they've not stretched nor lost
tension in two years. Perhaps over tensioning is partly to blame for
cables loosening or stretching. I think that Certified aircraft cable
tension are a bit high for the structures seen in LSA aircraft.
I'd recommend you stick with cable or whatever the plans call for.
Larry McFarland 601HDS at www.macsmachine.com
John REINKING wrote:
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Howdy, group
I've been reading about using pushrods instead of cables for operating
the aelerons. Will some of you with more experience than this novice
mind discussing the pros and cons of pushrods v. cable in this
application.
Am curious if the added weight of the pushrods would be a better
longterm replacement for the normal stretching of control cables in
this application.
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