Eagler's Nest

Airframes => Single Seaters => Topic started by: Jon Miller on February 24, 2023, 08:41:37 AM

Title: Pushrod vs Cables
Post by: Jon Miller on February 24, 2023, 08:41:37 AM

Hi All,
I read an article where an experienced builder (Sam Buchanan I think) used a pushrod instead of cables for the elevator.  The pushrod appeals to me due to the greatly reduced failure points vs the cable system, BUT I keep reading that one should not deviate from the plans......  Has anyone else done the Pushrod?  What size tubing should be used?  Thanks!

Title: Re: Pushrod vs Cables
Post by: DA Miller on February 24, 2023, 04:38:08 PM

search for pushrod on this forum. Several have implemented this change.

Title: Re: Pushrod vs Cables
Post by: Jon Miller on February 25, 2023, 03:12:45 PM

There only result I get searching "pushrod" is my own post.......:)

Title: Re: Pushrod vs Cables
Post by: Dan_ on February 25, 2023, 06:52:33 PM

There's a search box in the upper right corner and a search menu item.  Sometimes you get different results depending on which one you use.  I'm rather certain the reason is the "default parameters" each one uses.

I typed in "pushrod controls" with the search in the header menu and got 2 hits...

Title: Re: Pushrod vs Cables
Post by: Kamcoman77 on February 25, 2023, 08:51:30 PM

Search for pushrods. I got 13 hits although some were about engine pushrods.

Title: Re: Pushrod vs Cables
Post by: Theodore on March 09, 2023, 06:36:36 AM

push/pull cables/rods tubes... searching is all about typing correct sequence of words. I want to try pex tubing(plumbing isle of hdepot), 1/2 inside of 5/8 for instance. hilbilly version of what may cost a grand if ordered online.
underground pex has better uv resisance yet still detierate.

EAA link
https://www.eaa.org/eaa/aircraft-building/builderresources/while-youre-building/building-articles/control-systems/push-pull-tube-control-installations

http://acversailles.free.fr/documentation/08~Documentation_Generale_M_Suire/Cellule/Commandes/Push_pull_tube_control_system_installations.pdf

Title: Re: Pushrod vs Cables
Post by: Chuck in Indiana on March 09, 2023, 08:28:24 AM

Seems to me to be "much ado about nothing."  :) Unless a guy is doing push pull tubes for the ailerons, too.. (!) You already have everything to do the elevator cables. Yes, you *can* take all slop out of the elevator controls with push pull and ball bearings..I did that on the Pitts.. but you'll need a walking beam most likely. More weight and complexity than a couple of pulleys and some Piper fairleads. Does the Legal Eagle need that kind of precision? Uhh, no.  :grin: