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Diagonal LE braces

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jdm(at)wideworld.net
Guest

Posted: Sun Mar 05, 2006 4:28 pm Post subject: Diagonal LE braces

I got my plans out (Firestar # 86) and looked at the detail for the wing construction. There are two 5/16 diagonal braces off of the root rib that keep the LE in column. That's it. I'm going to look in one the inspection covers (or make a new one) and inspect these braces.  If they are secure and I don't do anything crazy, I feel I should be alright.  Any comments are welcome.



Also a very easy thing to do would be to add a removable (would have to be to fold and unfold) brace such as a tube that slides over and locks the leading edge tubes joining the two wings together as one.  I would think that this would lock to entire wing together as one and keep the leading edge in column.





John



Firestar #86

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Sun Mar 05, 2006 4:51 pm Post subject: Diagonal LE braces

Excellent idea. Especially if you tied the joiner to the gap seal so 

that it couldn't move either left or right.

Or else made the gap seal so that it couldn't move left or right,  (a 

snug fit between the two root ribs?) and then had a way to just pin each 

leading edge to it.



Richard Pike

MKIII N420P (420ldPoops)



John Murr wrote:

 	  Quote: 	
		   



 Also a very easy thing to do would be to add a removable (would have to be to fold and unfold) brace such as a tube that slides over and locks the leading edge tubes joining the two wings together as one.  I would think that this would lock to entire wing together as one and keep the leading edge in column.





 John



 Firestar #86

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Richard Pike
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Kingsport, TN 3TN0

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jdm(at)wideworld.net
Guest

Posted: Sun Mar 05, 2006 4:57 pm Post subject: Diagonal LE braces

And there are 15 false ribs per side.  I know they don't have as much 

strength as the full ribs, but there is some added strength.  They do more 

than just hold the canvas taunt.  As others said before, if the LE is kept 

in column then the wing is very strong.

---

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Eugene Zimmerman

Joined: 10 Jan 2006
Posts: 392

Posted: Sun Mar 05, 2006 6:49 pm Post subject: Diagonal LE braces

On Mar 5, 2006, at 7:24 PM, John Murr wrote:

 	  Quote: 	
		  

 Also a very easy thing to do would be to add a removable (would  

 have to be to fold and unfold) brace such as a tube that slides  

 over and locks the leading edge tubes joining the two wings  

 together as one.  I would think that this would lock to entire wing  

 together as one and keep the leading edge in column.





 John



 Firestar #86


	


John,  very good idea !

That is one thing I did do to the five rib plane I wrote to you  

about.  I did not fold my plane but I connected the leading edges  

with a bolt in tube to which the gap cover was also secured.

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Sun Mar 05, 2006 7:03 pm Post subject: Re: Diagonal LE braces

 	  jdm(at)wideworld.net wrote: 	
		  



Also a very easy thing to do would be to add a removable (would have to be to fold and unfold) brace such as a tube that slides over and locks the leading edge tubes joining the two wings together as one.  I would think that this would lock to entire wing together as one and keep the leading edge in column.



John



Firestar #86 	




Hi John,



That idea really scares me.  If those wings tend to move in flight in relation to each other even a little bit, you will adding huge stresses to those diagnal tubes you were talking about.  I beleive that you could end up inducing a failure that way.  Joining the leading edges like that could cause stress to the leading edge portions of both wings that you have not considered.  That would take quite a bit of analysis to see what the effects of that would be.  I suggest you call Kolb tech support and see what they think about that.



Michael A. Bigelow

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jdm(at)wideworld.net
Guest

Posted: Sun Mar 05, 2006 7:03 pm Post subject: Diagonal LE braces

Gene,



Can you resend that e-mail you are referring to.  I deleted it by mistake. 

Thanks!

---

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Frcole(at)aol.com
Guest

Posted: Sun Mar 05, 2006 7:12 pm Post subject: Diagonal LE braces

Just talking about the leading edge tube on the Firestar, the only purpose I 

can see is that it supports the ribs from bowing under fabric loads and maybe 

sees a little bending but I had never considered it critical.  The false ribs 

on a FS2 would not support the LE tube from wiggling span wise as they are 

pinned to the main spar with just one rivet and cannot take any sideways bending. 

On my plane I could not stand the thought of drilling a hole so near the max 

tension location on the main spar and I glued them to the spar instead. Poor 

idea as several of them have broken free of the spar and rattle at idle. Have 

to fix them one day.

We had a guy inadvertently fly a Firestar that did not have the spar to cage 

pins safetyed. In the pattern one wing leading edge started moving up, pilot 

grabbed the wing and held it while he landed. Good job both pins did not back 

out.

Dick C

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WhiskeyVictor36(at)aol.co
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Posted: Sun Mar 05, 2006 9:07 pm Post subject: Diagonal LE braces

In a message dated 3/5/2006 7:34:27 P.M. Eastern Standard Time,  

jdm(at)wideworld.net writes:



add a  removable (would have to be to fold and unfold) brace such as a tube 

that  slides over and locks the leading edge tubes joining the two wings 

together as  one.

 

John M,

 

Hey, that sounds like a very good idea you thought of.  Go for  it.

 

Bill  Varnes

Original Kolb FireStar

Audubon NJ

Do Not  Archive

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