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Gaps in HS rib-to-front-spar joint

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PFolbrecht(at)starkinvest
Guest

Posted: Mon Jan 30, 2006 11:08 am Post subject: Gaps in HS rib-to-front-spar joint

I hate to have to post this.



As the title says, I have a slight gap in two ribs - one on each side.

It is at least wide enough to get a piece of paper under.  I have not

yet installed the rear spar so I could drill these out and re-rivet.

Something tells me that I really ought to.  Is it something I would need

to worry about?  Is it a strength issue?



Paul

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PFolbrecht(at)starkinvest
Guest

Posted: Mon Jan 30, 2006 12:16 pm Post subject: Gaps in HS rib-to-front-spar joint

To clarify, this is the front-flange of the main rib to front-spar joint

on a 9A HS.



________________________________



From: Folbrecht, Paul

Sent: Monday, January 30, 2006 1:06 PM

To: 'rv-list(at)matronics.com'

Subject: Gaps in HS rib-to-front-spar joint



I hate to have to post this.



As the title says, I have a slight gap in two ribs - one on each side.

It is at least wide enough to get a piece of paper under.  I have not

yet installed the rear spar so I could drill these out and re-rivet.

Something tells me that I really ought to.  Is it something I would need

to worry about?  Is it a strength issue?



Paul

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chaztuna(at)adelphia.net
Guest

Posted: Mon Jan 30, 2006 2:53 pm Post subject: Gaps in HS rib-to-front-spar joint

Paul,

  Only a sheet of paper? On my 8a HS and VS, the rib lengths were off so 

badly, that I couldn't maintain edge distance on the front spar flanges. 

(My kit was not matched hole remember)  I had to cut the front flanges off 

the affected ribs and make "scab" flanges to get everything to line up 

correctly. It wasn't the only place this was necessary on my kit. It sounds 

like your mis-alignment is slight however. If interested, I can email you 

photos of how to modify a rib using the scab flange method.

Charlie Kuss

 	  Quote: 	
		  

<PFolbrecht(at)starkinvestments.com>



I hate to have to post this.



As the title says, I have a slight gap in two ribs - one on each side.

It is at least wide enough to get a piece of paper under.  I have not

yet installed the rear spar so I could drill these out and re-rivet.

Something tells me that I really ought to.  Is it something I would need

to worry about?  Is it a strength issue?



Paul

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Bob Perkinson

Joined: 10 Jan 2006
Posts: 51
Location: Hendersonville, Tennessee

Posted: Mon Jan 30, 2006 5:11 pm Post subject: Gaps in HS rib-to-front-spar joint

If memory serves me the 2 inboard ribs are canted to the outside and require

the fabrication of .040 shims (HS-909) to fill the gap



Bob Perkinson

Hendersonville, TN.

RV9 N658RP Reserved

If nothing changes

Nothing changes





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webmaster(at)flion.com
Guest

Posted: Mon Jan 30, 2006 7:38 pm Post subject: Gaps in HS rib-to-front-spar joint

Some of the other replies reference a fit problem but I read it that the

parts fit and that you had a small gap after riveting.  If that's the case,

yes, you should drill them out and rivet again.  Squeezing is the best

method there; I found that driven rivets tended to gap where the parts were

fairly flexible, unless I clamped near the hole, which made driving rivets

more difficult.  Where those rib flanges are, there aren't enough clecos or

other structure to keep things from flexing and separating while you rivet.

This will be true on all remaining structure - wing ribs and fuselage

bulkheads.



The preceding refers to a gap at the rivet.  It the gap is between rivets,

there is some fitment issue in the structure.  I'd have a tech counselor

look at it and advise you.



Pat Kelley - RV-6A - Cabin floors in, working on passenger seat.



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aerobubba(at)earthlink.ne
Guest

Posted: Tue Jan 31, 2006 5:49 am Post subject: Gaps in HS rib-to-front-spar joint

Hi Paul-



Re:  "I hate to have to post this.  As the title says, I have a slight

gap...  ...It is at least wide enough to get a piece of paper under. I have

not

 	  Quote: 	
		  yet installed the rear spar...  ...Is it something I would need

to worry about? Is it a strength issue?"

 

Paul

 
	


If I understand your situation correctly, I would say that yes, those

should be re-done.  I believe that structural members such as the ones in

question here should definitely be in full contact.  I'd be concerned that

the rivets in question would loosen pretty quickly in service.  In any

case, I'd also suggest that correcting the issue now will prevent sleepless

nights in the future.



I believe that the phenomena you have encountered here is generally caused

by not holding the bucking bar sufficiently tight to the rivet during

bucking.  This allows the bucking bar to 'chatter' against the rivet, which

can cause the gap between the parts.  You may wonder how I know this....  

 



Glen Matejcek

aerobubba(at)earthlink.net

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PFolbrecht(at)starkinvest
Guest

Posted: Tue Jan 31, 2006 7:28 am Post subject: Gaps in HS rib-to-front-spar joint

It seems that I overstated the case.  I posted from the office, without

the parts in sight, after having thought about this "gap" for several

hours.  It turns out that there is full contact where the rivets are and

the gaps are only between rivets, for whatever reason.  I probably

should have clamped to prevent this (I had clecos in two of the three

holes when riveting but no clamps) but I don't think it's a concern.

Come to think of it, if the rib had been offset any significant amount,

the skin-to-rib rivets would not likely have fit without redrilling, and

they did.



So, again, I'm afraid this was 90% my newbie-perfectionism and my

overactive imagination at work.  I apologize for not looking at things

more carefully before posting.



Thanks.



Paul



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