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Enough OSH back to builder support - Longerons

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rv10(at)sinkrate.com
Guest

Posted: Mon Jul 30, 2007 5:36 pm Post subject: Enough OSH back to builder support - Longerons

I match drilled the F-1046-R Longeron today onto the F-1005E-R gusset (Section 29-9 Step #3) and don’t like how close to the edge of the longeron the holes ended up.  Edge distance is easily violated on my first attempt so the wife was kind enough to swing by Van’s to pickup some extra AA6 0125 stock to remake the longeron (at least it’s the shorter one right).  I have been looking over this section of the plane very carefully trying to avoid having this same issue on the left side or again on the replacement longeron.  

   

The issue I am having is I don’t see how the outside edge of the longeron can be flush against the skin and not violate the edge distance when match drilling to the gusset.  I have uploaded some pictures since they usually do a better job explaining things than I can (click them to see larger versions).  

   

http://www.sinkrate.com/rv10/pics.asp?f=sec29  

   

Pic #1 shows the poorly drilled longeron with the holes being too close to the edge  

Pic #2 shows a scrap piece of ¾ AA6 angle showing the position of the longeron when I drilled it.  

Pic #3 shows how the longeron should be positioned to provide adequate edge distance.  

Pic #4 is a top down view of pic 3.  

   

Pic #3 is a little aggressive in that I think I could position the longeron about half way between the skin and its current position and come out ok but that would still pull on the skin pretty hard when riveting to the longeron.  

   

I think if I clamped it more firmly and made sure that all 5 of the holes had the spacing showing on the forward most hole in picture #1 it would be acceptable but I thought I would send an email to see what others think.  

   

Any thoughts, comments, advice on what others did on this step?    

   

THX  

   

-Ben Westfall  

PDX  

40579 – Fuse Side Skins…  

       [quote][b]

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bldgrv10450(at)comcast.ne
Guest

Posted: Mon Jul 30, 2007 8:02 pm Post subject: Enough OSH back to builder support - Longerons

Ben

  

 I just got back from Oshkosh and the first thing  completed was bending the same F-1046 longerons. Bending took longer then I  expected to get them right and I thought they looked great until the plans said  "now cut to length matching the pattern" that's when I noticed  that they were both exactly 1" short. Almost perfect just  short. Ben maybe your wife can pick-up a new set of F-1046's for me too.  What could be the chances for both of us needing the same replacement part at  the same time and we only live a couple miles from each other and about 14 miles  from Van's.

  

 Oshkosh was a blast. I enjoyed meeting many  other builders, the BBQ's at Michael's and RV camping area, hanging  out at The Schmidt's beside their beautiful airplane with Dr. Fred  Williams, Tim Olsen and others. Special thanks to John Cox  for hosting an Oshkosh first timer, complete tour of the grounds including  seaplane base and, formation flying acrobatics in a CJ warbird, a  beautiful house in town for camping, and a final day small  group tour at Gulfstream in Appleton.   

  

 Paul Grimstad

RV10 40450

Portland,  Or.

  

 do not archive

 [quote]   ---

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rv10(at)sinkrate.com
Guest

Posted: Mon Jul 30, 2007 8:36 pm Post subject: Enough OSH back to builder support - Longerons

I cut, bent, and drilled all holes but the offending ones in the new longeron tonight.  I have clamped, measured, and clamped again then measured again several times.  It looks like there is NO wiggle room at all in getting the F-1046 longerons clamped in place with respect to edge distance and proper fit against the skin.  I think I can drill the holes through the gusset this time w/o violating edge distance but builder beware when you get to this step be sure you spend lots of time clamping and measuring before drilling otherwise you get more practice at bending longerons….. J   

   

Paul I am taking this week off from my paying job to spend some time working on the airplane so I might be able to get to Van’s again to pickup another set of longerons for you.  I actually have one extra 6’ length cause I bought two incase I messed up again.  So at a minimum I’ve got you covered for 50 percent assuming all goes well match drilling this time.  Give me a call on Tuesday 503-639-4049.   

   

Ben Westfall  

Portland, OR  

40579  

   

FOR SALE:  One pre-bent longeron already screwed up so you don’t have to J  

   

   

   

   

         

  

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Paul Grimstad

 Sent: Monday, July 30, 2007 9:01 PM

 To: rv10-list(at)matronics.com

 Subject: Re: Enough OSH back to builder support - Longerons  

  

     

Ben  

    

   

    

I just got back from Oshkosh and the first thing completed was bending the same F-1046 longerons. Bending took longer then I expected to get them right and I thought they looked great until the plans said "now cut to length matching the pattern" that's when I noticed that they were both exactly 1" short. Almost perfect just short. Ben maybe your wife can pick-up a new set of F-1046's for me too. What could be the chances for both of us needing the same replacement part at the same time and we only live a couple miles from each other and about 14 miles from Van's.  

    

   

    

Oshkosh was a blast. I enjoyed meeting many other builders, the BBQ's at Michael's and RV camping area, hanging out at The Schmidt's beside their beautiful airplane with Dr. Fred Williams, Tim Olsen and others. Special thanks to John Cox for hosting an Oshkosh first timer, complete tour of the grounds including seaplane base and, formation flying acrobatics in a CJ warbird, a beautiful house in town for camping, and a final day small group tour at Gulfstream in Appleton.     

    

   

    

Paul Grimstad

 RV10 40450

 Portland, Or.  

    

   

    

do not archive  

  [quote]    

---

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planesmith(at)hotmail.com
Guest

Posted: Tue Jul 31, 2007 6:49 am Post subject: Enough OSH back to builder support - Longerons

I ran into the same problem and this is what I found. If you look at your picture #1 the aft hole has much less edge clearance than the front hole. By twisting the F-1005-E inward slightly (counter clockwise on the left one) it will improve the edge clearance on the aft hole. Next on picture #2 the longeron is pushed up hard against the outer skin, to the point it is bowing the skin out at the top. Try moving the longeron in just a little as this skin edge will blend into the fiberglass cabin top. Oh and yes there isn't much play here.

  

 Also, when you pick up new angle at Van's take a camera along and ask to take pictures of a quick build fuse if they have one in stock.

  

 Vern Smith (#324 fuselage systems)  

  	  Quote: 	
		    From: rv10(at)sinkrate.com

To: rv10-list(at)matronics.com

Subject: RV10-List: Enough OSH back to builder support - Longerons

Date: Mon, 30 Jul 2007 18:28:32 -0700



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I match drilled the F-1046-R Longeron today onto the F-1005E-R gusset (Section 29-9 Step #3) and don’t like how close to the edge of the longeron the holes ended up.  Edge distance is easily violated on my first attempt so the wife was kind enough to swing by Van’s to pickup some extra AA6 0125 stock to remake the longeron (at least it’s the shorter one right).  I have been looking over this section of the plane very carefully trying to avoid having this same issue on the left side or again on the replacement longeron. 

  

The issue I am having is I don’t see how the outside edge of the longeron can be flush against the skin and not violate the edge distance when match drilling to the gusset.  I have uploaded some pictures since they usually do a better job explaining things than I can (click them to see larger versions). 

  

http://www.sinkrate.com/rv10/pics.asp?f=sec29 

  

Pic #1 shows the poorly drilled longeron with the holes being too close to the edge 

Pic #2 shows a scrap piece of ¾ AA6 angle showing the position of the longeron when I drilled it. 

Pic #3 shows how the longeron should be positioned to provide adequate edge distance. 

Pic #4 is a top down view of pic 3. 

  

Pic #3 is a little aggressive in that I think I could position the longeron about half way between the skin and its current position and come out ok but that would still pull on the skin pretty hard when riveting to the longeron. 

  

I think if I clamped it more firmly and made sure that all 5 of the holes had the spacing showing on the forward most hole in picture #1 it would be acceptable but I thought I would send an email to see what others think. 

  

Any thoughts, comments, advice on what others did on this step?   

  

THX 

  

-Ben Westfall 

PDX 

40579 – Fuse Side Skins…

 	  Quote: 	
		  



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jchang10

Joined: 05 Jul 2006
Posts: 227

Posted: Tue Jul 31, 2007 8:15 am Post subject: Enough OSH back to builder support - Longerons

http://www.jline.com/log/aviation/build/fusekit/photos/sec29/IMG_4645.html



This was my result. i just did this a few days ago. This part, and this 

entire section has been very tricky. I just clamped and twisted until i 

had at least a parallel line of holes with the edge, and barely 

maintained edge distance. however, even though everything was clamped, 

the end result still produced a small gap (1 or 2 32nds) between the 

longeron and skin for some reason. if the skin were perfectly flushed, 

then i don't think edge distance would have been maintained by that gap.



i too would be curious to see photos of quickbuilds in this area. 

drilling all those weldments was a lot of work too!



Jae

40533

getting beat up by the fuse side skins

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_________________
#40533 RV-10
First flight 10/19/2011
Phase 1 Done 11/26/2011

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