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01-02-2022, 10:19 AM
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Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,212
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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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Larry DeCamp
RV-4 fastback in process w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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01-02-2022, 10:52 AM
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Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,852
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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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Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA
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01-02-2022, 11:02 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,901
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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.
__________________
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
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Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
RV-8 - SDS CPI - SOLD
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01-02-2022, 11:14 AM
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Join Date: Jun 2005
Location: Georgetown, TX
Posts: 1,135
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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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Brian Decker
RV-7 (Flying)
Last edited by bjdecker : 01-02-2022 at 11:17 AM.
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01-02-2022, 11:21 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,901
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Yep. Thats what I had.
Stud pushes right out.
__________________
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
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Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
RV-8 - SDS CPI - SOLD
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01-02-2022, 11:28 AM
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Join Date: Sep 2005
Location: Ottertail, MN
Posts: 2,510
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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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Alex Peterson
RV6A N66AP 1750+ hours
KADC, Wadena, MN
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01-02-2022, 11:33 AM
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Join Date: Jun 2005
Location: Georgetown, TX
Posts: 1,135
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Quote:
Originally Posted by Toobuilder
Yep. Thats what I had.
Stud pushes right out.
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...Yikes...
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Brian Decker
RV-7 (Flying)
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01-02-2022, 01:55 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,901
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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.
__________________
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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01-02-2022, 02:00 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,901
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Quote:
Originally Posted by AlexPeterson
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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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.
__________________
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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01-02-2022, 03:26 PM
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Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,764
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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!
__________________
Ralph
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
Last edited by Ralph Inkster : 01-02-2022 at 03:35 PM.
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