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  #1  
Old 02-23-2014, 08:24 PM
Maxrate Maxrate is offline
 
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Location: League city, TX
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Default Aileron pushrod rod end length

Well, I decided to weld the W-818 pushrods. I was careful to get the exact length that the plans call for on the cut, 23 13/16". After the rods were installed and the W-730 bellcrank jig in place, I'm a whole 1/8 inch difference on the number of threads that are in the rod end bearings. the plans show almost 5/8" of the threaded shank inside the bearing, and all I have is 1/2" on both ends. After searching DWG-15A and the construction manual I can't find anything that has a minimum number of acceptable threads inside of the rod end bearings. I imagine this is acceptable, but has anyone else run into this?

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  #2  
Old 02-23-2014, 09:38 PM
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grayforge grayforge is offline
 
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1/2" would be fine.

The other important variable is that the threads need to be over 1/2 way in the bearings. If you loosen the stop nuts fully and twist the rod all the way one direction and all the way the other, the thread should not come out of the bearings.
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  #3  
Old 02-23-2014, 09:39 PM
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Walt Walt is offline
 
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From Aurora bearing FAQ section:

What is the minimum thread engagement required to support the advertised load ratings in the Aurora Bearing Company catalog?

The minimum thread engagement is 1.5 times the major thread diameter unless otherwise stated.
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  #4  
Old 02-24-2014, 03:04 AM
chopperchops chopperchops is offline
 
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When assembled, a final safety check involves using something like a paper clip, or 0.032" lockwire and pushing it into the rodend bearing pin hole. The lockwire should not pass through, it should contact the threaded rod. If not, the thread engagement is insufficient.
From the pics provided, rod engagement in the rodend is fine.
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  #5  
Old 02-24-2014, 07:13 PM
Maxrate Maxrate is offline
 
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Thank's for the replies on such a critical part!
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  #6  
Old 02-24-2014, 08:42 PM
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grayforge grayforge is offline
 
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Have you already constructed the large aileron pushrods? Many find the stock dimensions 1/4" or more too short. Mine were. They would twist off the rod end bearing when installed in my RV-7A and controls set to neutral. I ended up fabricating a 2nd set 3/8" longer that worked perfectly.
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  #7  
Old 02-25-2014, 05:00 PM
Maxrate Maxrate is offline
 
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Russ,

I actually followed your thread and made the 3/8 adjustment to my long push rods. Love the VAF!!

Thanks
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  #8  
Old 02-25-2014, 05:56 PM
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grayforge grayforge is offline
 
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Awesome. Glad that helped!
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  #9  
Old 07-08-2014, 08:47 AM
Iluke Iluke is offline
 
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Default Target pushrod length?

Russ-

I'm about to the point of cutting my long aileron push rod tubes and I'd like to benefit from your experience. Can you confirm the extra length that you came up with was 66 1/8 and that worked? A close look at your photo seems to show a smidge over 66 1/8.

What length do you suggest I shoot for when cutting mine?

Thanks for your great posts.

-Ivan
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  #10  
Old 07-08-2014, 08:54 AM
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s10sakota s10sakota is offline
 
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I've already cut my long pushrods to the length called for on the plans. If that turns out to be too short, then I would expect Vans to replace them!
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