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  #1  
Old 10-22-2022, 11:04 AM
Tacco Tacco is offline
 
Join Date: Jan 2017
Location: White Salmon, WA
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Default Stabilator Counter Weight Failure

Van’s analyzing. Expect something soon.
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  #2  
Old 10-22-2022, 01:26 PM
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Piper J3 Piper J3 is offline
 
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Any chance you can elaborate a little bit on what happened?
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  #3  
Old 10-22-2022, 10:29 PM
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Originally posted on FaceBook RV-12 Builder’s page. Not much info there except Van’s posted they were aware of it happing on one other aircraft and that they would be providing their assessment soon.
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  #4  
Old 10-22-2022, 11:02 PM
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greghughespdx greghughespdx is offline
 
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Our engineering team is reviewing and we will share info once complete.
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  #5  
Old 10-23-2022, 12:24 AM
RFSchaller RFSchaller is offline
 
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Seems odd. I wouldn’t think this is subject to fatigue or overload. Maybe bad welds?
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  #6  
Old 10-23-2022, 12:36 AM
scsmith scsmith is offline
 
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Just as a point of information, under FAR Part 25 (transport catagory) mass balance/counterweight systems are to be designed for limit load of 100 g's in primary motion direction and (IIRC) 30 g's in transverse direction. Under FAR Part 23, balance/counterweight systems are to be designed for limit load of 25 g's in primary motion direction and (IIRC) 10 g's in transverse direction.

Note these are limit loads, subject to a Factor of Safety of 1.5 for failure.

This just gives some context for the level of robustness that counterweight attachments usually have.

BTW, is that blood I see next to that nylon zip-tie holding an antenna cable to a longeron/stiffener?
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  #7  
Old 10-23-2022, 12:46 AM
docjjrmd docjjrmd is offline
 
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Looks like transverse failure to me, loose weights acting as hammer load with every turn? No hours on airframe provided. Is it an SLSA IFR trainer with the VOR antenna installed? Or an EAB/ELSA flown in IMC that got rough? Be fun to see what the engineers come up with. Clearly not a weld failure. Imagine someone would like to look at that counter balance arm under a microscope.
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  #8  
Old 10-23-2022, 06:17 AM
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Piper J3 Piper J3 is offline
 
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I wonder how the airplane flies when the weight falls off in-flight? Apparently controllable... as witnessed by photo above where airplane appears intact.

I bet a SB to be issued soonest....
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 830

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H

Last edited by Piper J3 : 10-23-2022 at 06:19 AM.
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  #9  
Old 10-23-2022, 10:26 AM
N8DAV8R N8DAV8R is offline
 
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Also mentioned by Van's in the FB groups post is that they are aware of another case with similar or same failure.


Quote:
Originally Posted by docjjrmd View Post
Looks like transverse failure to me, loose weights acting as hammer load with every turn? No hours on airframe provided. Is it an SLSA IFR trainer with the VOR antenna installed? Or an EAB/ELSA flown in IMC that got rough? Be fun to see what the engineers come up with. Clearly not a weld failure. Imagine someone would like to look at that counter balance arm under a microscope.
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  #10  
Old 10-23-2022, 10:58 AM
PilotBrent PilotBrent is offline
 
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Location: Hackettstown, NJ
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Quote:
Originally Posted by Piper J3 View Post
I wonder how the airplane flies when the weight falls off in-flight? Apparently controllable... as witnessed by photo above where airplane appears intact.

I bet a SB to be issued soonest....
God help me if I have to crawl into the back of that tailcone again....
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