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wing attachment hardware

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clrprop

Joined: 16 Sep 2008
Posts: 44
Location: SC

Posted: Thu Oct 23, 2008 7:25 am Post subject: wing attachment hardware

What kind of hardware are you all using for your wing attachment?



Most of mine are the clevis pins w/ cowling safety clips. Some are too short to get a washer on underneath the clip. This doesn't look very safe to me. Are these ok or is it better to go with bolts and castle nuts?



Keath T

Mk III C

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NeilsenRM(at)comcast.net
Guest

Posted: Thu Oct 23, 2008 7:57 am Post subject: wing attachment hardware

Keath



That's the way most all are. I personally use the ring type safety clips 

because long grass has been known to pull the cowl clips off. Others have 

said the ring clips might work their way out but I doubt it. Some people 

that don't fold their wings have used bolts with lock nuts. Some even have 

used bushings/spacers that lock the wing attachments together. There is no 

reason why you can't use castle nuts. What ever you use be sure it is AN 

hardware for the pins or bolts.



Also always check the safety clips on preflight for wear.



Rick Neilsen

Redrive VW powered MKIIIC



---

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Thu Oct 23, 2008 8:41 am Post subject: wing attachment hardware

At 11:25 AM 10/23/2008, clrprop wrote:



 	  Quote: 	
		  What kind of hardware are you all using for your wing attachment?



Most of mine are the clevis pins w/ cowling safety clips. Some are too 

short to get a washer on underneath the clip. This doesn't look very safe 

to me. Are these ok or is it better to go with bolts and castle nuts?


	


I don't think it's an issue; I've never heard of a failure (has 

anybody?).  I don't have washers under the clips on any of mine.  Since I 

fold the wings every time I fly each connection gets checked anyway.  If I 

weren't folding every time I'd probably go with bolts and locknuts, though.



-Dana



--

  In England, the cops say, 'Halt or I'll say halt again!'

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Thu Oct 23, 2008 9:35 am Post subject: Re: wing attachment hardware

There have been cases where the safety pin has been undone on the tail wire attachment on the bottom of the rudder due to long grass.  I use a castle nut with cotter pin that you permanently bend in place for that attachment, and nylock nuts on the wings since I do not fold my wings.   If you must fold, I like the key chain type circlips, rather than the safety pin type which are more easily knocked open.



Mike

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"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

by0ung(at)brigham.net
Guest

Posted: Fri Oct 24, 2008 7:05 am Post subject: wing attachment hardware

If the pins are too short to put on a washer....  get longer pins.    Or go

with bolts and nuts,,,  remember some areas are not designed to be tightened

down with lots of torque on the bolts... I would tighten so that you could

still easily  rotate the bolt by hand.



Boyd Young

Kolb MKIIIC

 	  Quote: 	
		  >>>>>>>>>>>>>


	


What kind of hardware are you all using for your wing attachment?



Most of mine are the clevis pins w/ cowling safety clips. Some are too short

to get a washer on underneath the clip. This doesn't look very safe to me.

Are these ok or is it better to go with bolts and castle nuts?



Keath T

Mk III C

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olendorf

Joined: 06 Jul 2006
Posts: 140
Location: Schenectady, NY USA

Posted: Fri Oct 24, 2008 9:34 am Post subject: Re: wing attachment hardware

What purpose does the washer provide in this case? The FAA inspector that gave me the airworthiness inspection also recommended I put washers under the cowling pins. I can only assume it would cut down an pin wear if the clevis pin was rotating.   I didn't add the washers.  I have the cowling pin in my hand twice every time I fly. If it was worn out I'd know it.

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Scott Olendorf
Original Firestar, Rotax 447, Powerfin prop
Schenectady, NY
http://sites.google.com/site/kolbfirestar/

Steven Green

Joined: 05 Feb 2006
Posts: 118

Posted: Fri Oct 24, 2008 3:17 pm Post subject: wing attachment hardware

The Kolb plans do not call for washers on the pins.  I would not put them on 

due to the washers being free to spin and cause significant wear to the cowl 

pin.  I have seen a washer on a loose bolt spinning at approximately 120 rpm 

just being driven by the vibration of the machine.  It's the hula hoop 

affect just smaller and faster.  I also would not use "key chain" rings as 

they are not made to any quality standard.  I guess I just have a lot of 

faith in the design that Homer came up with.  If I didn't fold and trailer I 

would probably use AN bolts and castle nuts.



Steven Green

MK3 912S

560 hrs with washerless cowl pins.

But not the same ones, they are replaced at least annually.

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Steven Green

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Fri Oct 24, 2008 3:35 pm Post subject: wing attachment hardware

At 07:16 PM 10/24/2008, Steven Green wrote:



 	  Quote: 	
		  The Kolb plans do not call for washers on the pins.  I would not put them 

on due to the washers being free to spin and cause significant wear to the 

cowl pin.  I have seen a washer on a loose bolt spinning at approximately 

120 rpm just being driven by the vibration of the machine.  It's the hula 

hoop affect just smaller and faster.  I also would not use "key chain" 

rings as they are not made to any quality standard.  I guess I just have a 

lot of faith in the design that Homer came up with.  If I didn't fold and 

trailer I would probably use AN bolts and castle nuts.


	


I agree, I use the AN pins with no washers, except at one location:  The 

UltraStar plans DO call for a ring cotter (the plans call it a "safety 

circlip") at one location, the pin that holds connects the elevator horns 

to the control arm in the back of the boom tube (done differently on the 

later Kolbs, I believe?).  I bought a package from the marine store, but I 

didn't trust the "tail" that's supposed to make it easy to install, looks 

like it'd make it easy to come loose, as well... a friend who flies a GT400 

gave me some without the tail; that's what I use now.



-Dana

--

  Democracy is three wolves and a sheep voting on what to have for lunch.

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