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  #1  
Old 01-02-2022, 10:19 AM
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,212
Default Heim joint without big washer (1996 RV4 )?

My RV4 kit ( circa 1996 ) came with Heim joint studs that secure the flap actuator rod in 1/8" doublers on the last rib. There is no way to add a big washer to prevent the race from coming off the ball. The ball simply has a dimple in it like a lathe center locator for threading the stud.

A loose flap could be a problem, right ? Any comments or solutions appreciated.
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RV-4 fastback in process w/ Superior roller 360/AFP/G3X/CPI/Catto3b
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  #2  
Old 01-02-2022, 10:52 AM
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Bill Boyd Bill Boyd is offline
 
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Location: Landing field "12VA"
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Default

Control linkage hardware can be among the most difficult little bits to fiddle with in cramped quarters. If you can get a bolt, 960 washer and lock nut in there, why not the standard-practice large washer? Maybe a photo would be helpful. I don't believe the dimple in the Heim body has anything to do with securing the race, but is an artifact of the manufacturing/threading process as you said. Others with far more knowledge will doubtless answer today and we'll all learn something.
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Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
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  #3  
Old 01-02-2022, 11:02 AM
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Toobuilder Toobuilder is offline
 
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Location: Mojave
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If this is one of those studded ball deals, the stud can be pressed out and then you have a regular heim. I did this on my Rocket for the exact concern you have.
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  #4  
Old 01-02-2022, 11:14 AM
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bjdecker bjdecker is offline
 
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Location: Georgetown, TX
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Default CM-4S?

Is it one of these CM-4S affairs, which are still used on the RV-7,8,9 flap attach pushrod ends.

Swap it out for a CM-4M and an AN4-nnnA bolt + washer stack.
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Last edited by bjdecker : 01-02-2022 at 11:17 AM.
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  #5  
Old 01-02-2022, 11:21 AM
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Toobuilder Toobuilder is offline
 
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Yep. Thats what I had.

Stud pushes right out.
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Michael Robinson
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1940 Taylorcraft BL-65
1984 L39C - SOLD
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  #6  
Old 01-02-2022, 11:28 AM
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AlexPeterson AlexPeterson is offline
 
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You guys saying 1 pulls right out of 2? Was it run dry for a decade? Which part wore enough to allow that?
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  #7  
Old 01-02-2022, 11:33 AM
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bjdecker bjdecker is offline
 
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Quote:
Originally Posted by Toobuilder View Post
Yep. Thats what I had.

Stud pushes right out.
...Yikes...
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  #8  
Old 01-02-2022, 01:55 PM
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Toobuilder Toobuilder is offline
 
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The stud is simply a close tolerance bolt which is swaged to the ball. No magic here. Apply enough force and the stud will release from the ball. Mine did not come loose in service, I simply wanted a nut and bolt there.

If you want to make it easier, just drill through the stud at the swage countersink and knock it free with a punch.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
RV-8 - SDS CPI - SOLD
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  #9  
Old 01-02-2022, 02:00 PM
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Toobuilder Toobuilder is offline
 
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Quote:
Originally Posted by AlexPeterson View Post
You guys saying 1 pulls right out of 2? Was it run dry for a decade? Which part wore enough to allow that?
No. #2 is the body. The ball is in the body, and the stud is in the ball. The stud is a press fit in the ball.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
RV-8 - SDS CPI - SOLD
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  #10  
Old 01-02-2022, 03:26 PM
Ralph Inkster Ralph Inkster is offline
 
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Location: Calgary, Alberta
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Every RV I've touched has used this stud style rod end on the flap linkage.
I have never encountered one that became loose.
My pre-flight walk around procedure is to visually check & shake the flap with my finger on that bearing before every flight.

If I ever encountered one that rattled even the slightest bit, that plane would be grounded till those linkage bearings were replaced. I'd be having a conversation with the owner/pilot about his maintenance practices too!
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Last edited by Ralph Inkster : 01-02-2022 at 03:35 PM.
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