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  #1  
Old 11-03-2020, 11:55 AM
Desert Rat Desert Rat is offline
 
Join Date: Aug 2018
Location: 50-50 Wichita KS & Scottsdale AZ
Posts: 544
Default quick disconnect for co-pilot stick question

Hey all- Gonna go with the button spring clip for a quick disconnect on the co-pilot stick.

Looks to me like positioning the hole at 12:00 gives the most access thru the stick boot cutout to push the button when you want to remove the stick, but the Vans service letter has you drill the hole for a bolt at 3:00-9:00, so presumably they like that positioning better, for whatever reason.

For those of you who've gone this route, how did you clock the hole for easiest access to get your finger on the button? If you did 3:00 - 9:00 did you regret it, or is it eezee peezee?

FYI- not planning a push to talk or any of that other claptrap on the co-pitot stick, so this is strictly a question of ease of removal.
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  #2  
Old 11-03-2020, 01:03 PM
rv6n6r's Avatar
rv6n6r rv6n6r is offline
 
Join Date: May 2007
Location: Gearhart Oregon
Posts: 302
Default

Quote:
Originally Posted by Desert Rat View Post
Hey all- Gonna go with the button spring clip for a quick disconnect on the co-pilot stick.
What is this button spring clip you speak of?
I've envisioned something like that but never seen a part or kit or anything. Link?
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Randall Henderson
RV-6 / O-360 / CS, 1500+ hrs, 1st flight Sept. 1999
Outstanding Workmanship OSH 2000
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Donated August 2020
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  #3  
Old 11-03-2020, 01:27 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,805
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Quote:
Originally Posted by rv6n6r View Post
What is this button spring clip you speak of?
I've envisioned something like that but never seen a part or kit or anything. Link?
People sometimes call them pit pins. I think they are formally called ball-lock pins.
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RV-8 N825RV
IO-360 A1A
WW 200RV
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  #4  
Old 11-03-2020, 01:30 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
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Default

Quote:
Originally Posted by Desert Rat View Post
Hey all- Gonna go with the button spring clip for a quick disconnect on the co-pilot stick.

Looks to me like positioning the hole at 12:00 gives the most access thru the stick boot cutout to push the button when you want to remove the stick, but the Vans service letter has you drill the hole for a bolt at 3:00-9:00, so presumably they like that positioning better, for whatever reason.

For those of you who've gone this route, how did you clock the hole for easiest access to get your finger on the button? If you did 3:00 - 9:00 did you regret it, or is it eezee peezee?

FYI- not planning a push to talk or any of that other claptrap on the co-pitot stick, so this is strictly a question of ease of removal.
The 3:00--9:00 position is stronger. Guidelines for control system strength specify design requirements for pilot stick force in pitch and roll. The pitch force is much bigger. If the hole was at 12:00, you would be putting a stress concentration hole in the location of highest stress due to bending in the stick.

Now practically speaking, this will almost never be a problem. But if there is a control jam of some sort that motivates a pilot to pull hard on the stick, you really don't want it to break.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet" Flying since Sept. 2009
Hobbs 635
LS6-15/18W sailplane SOLD
bought my old LS6-A back!!
VAF donation Dec 2020
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  #5  
Old 11-03-2020, 01:33 PM
SMRacer's Avatar
SMRacer SMRacer is offline
 
Join Date: Feb 2012
Location: Leesburg, VA
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Quote:
Originally Posted by rv6n6r View Post
What is this button spring clip you speak of?
I've envisioned something like that but never seen a part or kit or anything. Link?
This is what some have been using:

https://www.valcocleve.com/c-type-c-series/

I used part number C-131 for my rear seat stick attachment. I wouldn't suggest this type of connection for the primary stick, but I'm OK with the function for co-pilot.
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Last edited by SMRacer : 11-03-2020 at 01:43 PM.
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  #6  
Old 11-03-2020, 01:40 PM
rv6n6r's Avatar
rv6n6r rv6n6r is offline
 
Join Date: May 2007
Location: Gearhart Oregon
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Quote:
Originally Posted by scsmith View Post
People sometimes call them pit pins. I think they are formally called ball-lock pins.
I'm thinking of a spring / button internal to the stick, where you push the button or buttons (180 degrees) on the outside of the stick to release. Does that exist? I found one post with a link (Bruce Hill) but it doesn't have any detail about the spring / button, https://www.overthehills.com/RV-9A-P...laps-and-Trim/
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RV-6 / O-360 / CS, 1500+ hrs, 1st flight Sept. 1999
Outstanding Workmanship OSH 2000
Airport committee chair & ASNV for Seaside, OR Municipal (56S), www.seasideairport.org
Donated August 2020
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  #7  
Old 11-03-2020, 01:46 PM
pa38112 pa38112 is offline
 
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 925
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I use a quick release pin that goes all the way through. It is at 6:00 so you pull the pin towards you to release it. For a push button I would think 12:00 would be easiest for removal. I would be concerned with 3:00 and 9:00 (and 6:00) possable letting the button press against your passenger's leg and re-leasing.
It's not likely... but if I can invision it, it can happen. So many times I have done my control check and my wife's i-pad or coffee cup, or whatever is hitting the stick.
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  #8  
Old 11-03-2020, 01:58 PM
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Larco Larco is offline
 
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Location: DVT Phoenix
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I use a button pin at the 6:00 position and love it. I cannot believe that a pull in any direction could break the stick. The button pins do nothing more than hold the stick in the receiver? Stole the idea and never looked back. :-)

McMaster-Carr

# 94282A250 Spring Steel Button Pins for Telescoping Tubing, Single-Button Dog-Leg, for 1/2" to 3/4" Tubing ID, packs of 10
1
pack
Sep 10
5.10
per pack
5.10
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Last edited by Larco : 11-03-2020 at 02:35 PM.
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  #9  
Old 11-03-2020, 02:26 PM
Desert Rat Desert Rat is offline
 
Join Date: Aug 2018
Location: 50-50 Wichita KS & Scottsdale AZ
Posts: 544
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Quote:
Originally Posted by rv6n6r View Post
What is this button spring clip you speak of?
I've envisioned something like that but never seen a part or kit or anything. Link?
There is no kit. Vans used to be cool with literally just stuffing the co-pilot stick in the socket with nothing holding it their other than happy thoughts. Eventually, somebody pulled up instead of laterally and the stick came out in their hand while they were landing.

Vans came out with service letter SB-07-2-6 that calls for you to drill a hole all the way through the assy at 3:00-9:00 orientation and stick an AN3 bolt in there.

Seems like overkill and makes it inconvenient to remove the co-pilot stick.

I'm not really worried about making the stick weaker; I found some buttons like the links others have posted in their replies above that are only 4mm, which is basically the same diameter as a #8 screw. Basically just want to know which clocking is most convenient for getting my fingers down in the cutout to push the button if I want to take the stick out.
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AGI, CFI, CFII, MEI, A&P, Janitor
RV7 Empennage & Wing done
Fuselage in process
#72651
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  #10  
Old 11-03-2020, 03:07 PM
RVDan RVDan is offline
 
Join Date: Jun 2012
Location: Frederick, MD
Posts: 897
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Quote:
Originally Posted by Desert Rat View Post
There is no kit. Vans used to be cool with literally just stuffing the co-pilot stick in the socket with nothing holding it their other than happy thoughts. Eventually, somebody pulled up instead of laterally and the stick came out in their hand while they were landing.

Vans came out with service letter SB-07-2-6 that calls for you to drill a hole all the way through the assy at 3:00-9:00 orientation and stick an AN3 bolt in there.

Seems like overkill and makes it inconvenient to remove the co-pilot stick.

I'm not really worried about making the stick weaker; I found some buttons like the links others have posted in their replies above that are only 4mm, which is basically the same diameter as a #8 screw. Basically just want to know which clocking is most convenient for getting my fingers down in the cutout to push the button if I want to take the stick out.
At least from 1994 when I built my first -6, the plans called for a AN3 bolt through the stick.
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