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  #21  
Old 03-27-2012, 11:08 AM
flyboy1963's Avatar
flyboy1963 flyboy1963 is offline
 
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
Default should this become 'standard procedure'?

Thanks guys for all this...I've now added a number of things to my annual inspection! ...and another reason you shouldn't try to do the whole thing by yourself!
One other comment; air loads almost never 'make it better'....they invariably CAUSE things to bind, flex, etc.
or.......(would you listen to an appliance repair guy who says " oh, that grinding noise in your dishwasher will go away....." ?????)
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  #22  
Old 03-27-2012, 11:34 PM
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ArVeeNiner ArVeeNiner is offline
 
Join Date: Jun 2006
Location: San Jose, CA
Posts: 1,125
Default Found the problem!

Man, I feel a huge weight off my shoulders! I found the problem and fixed it!

I'll keep you all in suspense for a while. So, I get to the hangar tonight and I checked for the twizzle. All my torque tubes twizzled very well, thank you, which wasn't good news.

So, I laid down on my brand new 6 wheeled creeper (if you don't have one, get one) and crept under the right wing bellcrank. This is where my auto pilot servo is located. As I moved the aileron, I noticed a very slight flex of the bracket that it is mounted to. That ain't right! I then checked the twizzle of the small auto pilot servp push rod out there...IT TWAS TWIZZLE-LESS!

I had some washers on either side of the heim joint on one end but only one at the servo end. I remembered that Van's told me the other day that they added those tiny washers on either side of the heim joints at lower end of the sticks to prevent this problem from happening. What I needed was 4 of those tiny washers. I was sure I didn't have any spares.

I dug around in my spare hardware drawer and low and behold, I had 4 of them!

So I put them in and I suddenly got my twizzle back!!!! The ailerons move like butta. I was sure that I had exonerated the servo over the weekend. I remember disconnecting it and moving the stick but thinking that the problem was still there. Hmmmm.

So, pay attention to your auto pilot servo push rod and made sure you put those tiny washers on either side of the heim joints or else you'll lose your twizzle! (OK, I just love that word).

Thanks for the help and may the twizzle be with you.
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San Jose, CA
RV-9A

Pink slip issued: 5/7/12

First flight: 5/28/12, Memorial Day.

Phase I Complete: 8/18/12!

2020 donation: complete

Last edited by ArVeeNiner : 03-27-2012 at 11:41 PM.
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  #23  
Old 03-31-2012, 10:03 AM
Rupester Rupester is offline
 
Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
Default This thread coundn't be timelier ...

...I'm at exactly the same point in final assembly, and had noticed some binding in the R elevator that didn't exist in the left. Like the rest o' ya's, I figured it was the roll servo. Now I know there's a whole lot more to be checking out in this rigging process! Much appreciated.
Interesting that the diagrams from TruTrak for the installation of the roll servo don't mention those little #$%^ washers.
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  #24  
Old 04-01-2012, 09:03 PM
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ArVeeNiner ArVeeNiner is offline
 
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Location: San Jose, CA
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Default

I thought I was done with the bushings but this problem made me take a close look at them. You can really make them work well with a bit of work. I'm amazed how nice it feels now.

I bought a lifetime supply of those little washers (10) from Vans in case I have to take things apart someday and loose one.

After about 8 hours of work at the hangar today, I think I'm now ready for my inspection in the 18th. I just have to vacuum up real nice and finish up some paperwork.
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Kelly Johnson
San Jose, CA
RV-9A

Pink slip issued: 5/7/12

First flight: 5/28/12, Memorial Day.

Phase I Complete: 8/18/12!

2020 donation: complete
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  #25  
Old 04-02-2012, 07:29 AM
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Ironflight Ironflight is offline
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Join Date: Jan 2005
Location: Dayton, NV
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Default

when we put the RV-3 together for the final time, we had a little "stickiness" at the end of travel in one direction. It took forever to chase it down, but turned out to be that we needed an extra washer as a spacer between the bearing and the inboard hinge support. Too difficult to explain without pictures and drawings, but the bottom line is that you have to keep shimming and bushing until it is right. The drawings are a starting point, not the final solution.

Paul
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