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  #1  
Old 03-10-2015, 11:19 PM
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N546RV N546RV is offline
 
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Location: Brookshire, TX
Posts: 1,036
Default W-818 aileron pushrod length

While doing some research on other stuff, I ran across a handful of instances where RV-7 guys built their -718 pushrods (the ones from the cockpit to the bellcranks) to spec, only to find down the road that they were too short. Has anyone run into a similar issue with an RV-8?

I finished up my short pushrods tonight, and I'd like to go ahead and build the long pushrods and have them "stored" attached to the bellcranks in the wings, but I'd rather not find out they're useless in a year or so.

Thoughts? Experiences?
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  #2  
Old 03-10-2015, 11:58 PM
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cdmiller cdmiller is offline
 
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Location: Battle Ground, Washington
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Default Plans worked fine for me

I have built two RV-8's and followed plans for aileron pushrods lengths. Worked perfectly for me.

Dan Miller
Battle Ground, WA
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  #3  
Old 03-11-2015, 06:37 AM
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cjhammes cjhammes is offline
 
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Default Follow Plans

Worked fine for me too.
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  #4  
Old 03-11-2015, 07:31 AM
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BruceEicher BruceEicher is offline
 
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Location: Wilsonville/Aurora KUAO Oregon
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Default Me too

Quote:
Originally Posted by cdmiller View Post
I have built two RV-8's and followed plans for aileron pushrods lengths. Worked perfectly for me.

Dan Miller
Battle Ground, WA
No problem with the plans I have found. (Hello Dan)
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  #5  
Old 03-11-2015, 08:20 AM
EllisMcgaughy EllisMcgaughy is offline
 
Join Date: Nov 2014
Location: Fayetteville nc
Posts: 23
Default

I'm building a 7a and my pushrods were too short. I built two new ones about 5/16" to 3/8" longer.

I don't want there to be any chance a pushrod can loosen and untread itself!
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  #6  
Old 03-11-2015, 08:38 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Pushrods

Quote:
Originally Posted by EllisMcgaughy View Post
I'm building a 7a and my pushrods were too short. I built two new ones about 5/16" to 3/8" longer.

I don't want there to be any chance a pushrod can loosen and untread itself!
7a here too. Mine isn't flying but I took your advise and made mine 3/8" longer. I made the short tubes longer too. I just cut the tube in half. Once rigged, I rotated the rod all the way to the end and it couldn't fall out. Good test I learned on VAF.
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  #7  
Old 03-11-2015, 11:19 AM
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RV7A Flyer RV7A Flyer is offline
 
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Location: US
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Default

Built to plans and it's fine (can't unscrew itself from the rod ends).

I don't understand why some people end up short and others don't...assuming everyone is building to the same plans, how can this be?
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  #8  
Old 03-11-2015, 10:07 PM
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N546RV N546RV is offline
 
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Location: Brookshire, TX
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Default

Quote:
Originally Posted by RV7A Flyer View Post
Built to plans and it's fine (can't unscrew itself from the rod ends).

I don't understand why some people end up short and others don't...assuming everyone is building to the same plans, how can this be?
That's what I wonder, too. I don't want to throw out a blanket accusation of foul-ups on the part of the builders, but it seems like the most likely cause to me.

Anyway, I went ahead and assembled the things tonight. These were a cakewalk after doing the short rods with the solid rivets! Plus, after I was done, I had to temporarily install the bellcrank and both rods, then sit at the wing root and make the aileron move.



Thanks for the feedback!
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  #9  
Old 06-04-2015, 11:48 PM
Bevan Bevan is offline
 
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Location: BC
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Default

Mine were built according to the plans and are also too short UNLESS one is to accept that 5/16" insertion depth of the threaded portion (3/8" diameter) into the threaded cone is acceptable, or allow the control sticks to lean towards each other.

I seem to recall that insertion depth should be 1.5X diameter but cannot find that stated anywhere. Can anyone point me to a documented standard?

Bevan
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  #10  
Old 06-05-2015, 05:02 AM
bill v bill v is offline
 
Join Date: Mar 2011
Location: zeeland michigan
Posts: 127
Default tubes

look at the print there is two length given one for the tube and one for the total length of the finished tube center of bearing hole to center of the other bearing hole you will find the bearings thread into the cone at less then some people think is acceptable to get the total length if you cut the tube to the length given for the tube only
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