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reinkings(at)comcast.net
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 Posted: Sat Aug 09, 2008 3:25 pm Post subject: Aeleron (sp?) Push Rod Question/ CH601XL |
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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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amyvega2005(at)earthlink.
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| Posted: Sat Aug 09, 2008 4:32 pm Post subject: Aeleron (sp?) Push Rod Question/ CH601XL |
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Pushrods are great. Cables are just as Great. Depends on the design parameters of the plane. How much dihedral, Speed of plane, force on ailerons. Weight constraints of the plane, etc.. Simple answer is, for an LSA 700 plane with a pronounced dihedral, at speeds below 180 knots, cable is perfect. You want to put push rods?, no harm done there either, if you can figure out the design for the wings with the 601's dehidral, and get over the more work needed to get rods correctly cut to size.
Juan
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amyvega2005(at)earthlink.
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| Posted: Sat Aug 09, 2008 5:37 pm Post subject: Aeleron (sp?) Push Rod Question/ CH601XL |
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Also look at disances traveled between control points. You can use both in combo. Attached are some pictures showing push rod in short length to cable horn for the long travel on a KR2. Like I said both are just as good. In a b-29, yep, the Enola Gay, cables are used through out in long travel areas for controls.
Juan Vega
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planes_by_ken(at)bellsout
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| Posted: Sat Aug 09, 2008 6:03 pm Post subject: Aeleron (sp?) Push Rod Question/ CH601XL |
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If cables are good enough of a DC-9 aileron and elevator system they are
good enough for me ; )
A disadvantage of pushrods is the possibility of play in the rod ends
becoming significant. Mooney has an AD on the control system for
inspection and lubrication to prevent excess wear. They have a lot of
rod ends!
Ken Lilja
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grant.corriveau(at)TELUS.
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| Posted: Sun Aug 10, 2008 6:21 am Post subject: Aeleron (sp?) Push Rod Question/ CH601XL |
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RE: In a b-29 yep, the Enola Gay, cables are used through out in long travel areas for controls.
Yup - it's called fly-by-wire, beta version... with all the inherent problems of pulleys and so on, I'm not sure why folks are sometimes uneasy with the current, more electronic version fly-by-wire, version 3.0... as used on Airbus 'n such... <grin>
[quote][b]
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