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Elevator Cables Again
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john.marzulli(at)gmail.co
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Posted: Thu Nov 10, 2011 8:04 am Post subject: Elevator Cables Again

How does the elevator bellcrank\pushrod handle the twisting motion from the front of the stick? Do the rod ends really take that much rotation?

John Marzulli



http://MarzulliPhoto.net/

 http://701Builder.blogspot.com/

 



On Wed, Nov 9, 2011 at 11:32 PM, d.shrader <chilledj(at)yahoo.com (chilledj(at)yahoo.com)> wrote:

[quote] --> Zenith701801-List message posted by: "d.shrader" <chilledj(at)yahoo.com (chilledj(at)yahoo.com)>

 

 My version of the divorced elevator bell-crank mount

 

 dave

 

 

 

 

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d.shrader

Joined: 21 Nov 2008
Posts: 38

Posted: Thu Nov 10, 2011 8:11 pm Post subject: Re: Elevator Cables Again

I don't have the stops in for the aileron bell crank yet, so I have even more stick swing than is actually allowed.  The amount it swings is a total of 6" aprox. measured at base of the controle stick, without aileron stops installed (3" left an 3" right) the rod ends easily take up that travel with room for more twist.  If I had encountered binding in the rod ends the simple solution would be to add small diameter washers on either side of the rod end, but I didn't have that problem. I don't have the proper hardware in; in the picture (bolts to long) they were just installed to check freedom of movement.

   The elevator bell crank pivot point is in the exact location relative to the torque tube (notice in pic, the original steel mount cut down) so the length of the elevator push/pull tube is the same as the plans.  The elevator bell crank angle and demention is also the same as the plans.  Which means the length of the elevator control cables do not change, and the elevator bell crank dose not change, big plus if your retro fitting. 

  This didn't take to long to fabricate and to anyone considering a retro fit I'd say it'd take less than 2hrs to install (provided you'd spent a few hours in the shop fabricating the mount). Even the push pull tube can be reused with welded in threaded ends for the rod ends.  



Dave

Last edited by d.shrader on Sat Nov 12, 2011 8:15 pm; edited 1 time in total

cdnch701builder

Joined: 21 Aug 2010
Posts: 21
Location: Canada

Posted: Sat Nov 12, 2011 1:06 pm Post subject: Elevator Cables Again

Dave... where is the photo and the rest of your post????



Ron



:--)> 

:--)> <chilledj(at)yahoo.com>

:--)>

:--)> i don't have the stops in for the aileron bell crank yet so i

:--)> have even more stick swing than there actually is allowed and

:--)> the amount it swings is a total of 6" (3" left an 3" right) the

:--)> rod ends easily take up that travel with room for more.

:--)>

:--)> Dave

:--)>

:--)>

:--)> Read this topic online here:

:--)>

:--)> http://forums.matronics.com/viewtopic.php?p=357429#357429

:--)>

:--)>

:--)>    * AeroElectric www.aeroelectric.com

:--)> for your generous support!

:--)> --> http://www.matronics.com/contribution

_________________
cdnch701builder

d.shrader

Joined: 21 Nov 2008
Posts: 38

Posted: Sat Nov 12, 2011 1:57 pm Post subject: Re: Elevator Cables Again

[quote="cdnch701builder"]Dave... where is the photo and the rest of your post????



Ron

     The bottem of page 1 is the pic



Dave

leonardo

Joined: 01 Dec 2011
Posts: 3
Location: Argentina

Posted: Sat Dec 03, 2011 9:14 am Post subject: Re: Elevator Cables Again

nice work.  Any way i´d like to know if there is no change in pitch while you turn, because I think that while turning you might be pulling the elevator bellcrank through the pushrod . Isn´t it, or is it just negligible ?

Thanks for your help. Leonardo

d.shrader

Joined: 21 Nov 2008
Posts: 38

Posted: Thu Dec 08, 2011 12:01 am Post subject: Re: Elevator Cables Again

Leonardo, 



Myself and another mechanic cannot see any noticeable movement of the elevator bell crank going full aileron travel left, right (no aileron stops installed yet). Cannot be absolutely certain that there isn't a slight pitch movement (we just eyeballed it) however it is so slight I cannot imagine any pilot noticing it in a coordinated turn. 

I can respond after we finish up the cable rigging and let anyone interested know (reply if so) how much elevator deflection there is with full aileron travel but I'd be surprised if we see anything. 



Dave

leonardo

Joined: 01 Dec 2011
Posts: 3
Location: Argentina

Posted: Thu Dec 08, 2011 2:34 pm Post subject: Re: Elevator Cables Again

Thank you Dave. Did you use standard rod ends, like the ones supplied ? Thank for your help, and I´ll be waitng for your good results. Leo

d.shrader

Joined: 21 Nov 2008
Posts: 38

Posted: Fri Dec 09, 2011 11:18 pm Post subject: Re: Elevator Cables Again

We used http://www.aircraftspruce.com/catalog/appages/an490.php and standard rod ends.  This setup is flawless.



Dave

leonardo

Joined: 01 Dec 2011
Posts: 3
Location: Argentina

Posted: Sat Dec 10, 2011 6:07 am Post subject: Re: Elevator Cables Again

thanks again. Please give a thumb up whe the cables rigged. Will be very helpfull. Meanwile I´m preparing the pieces.

d.shrader

Joined: 21 Nov 2008
Posts: 38

Posted: Fri Feb 10, 2012 9:19 pm Post subject: Re: Elevator Cables Again

Leonardo,



Elevator cables in, and there is no deflection of the elevator when stick is moved from full left to full right or visa versa.



Dave

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