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  #521  
Old 02-12-2014, 11:33 AM
wrongway john wrongway john is offline
 
Join Date: Jul 2007
Location: TX & CO
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Quite a long thread, and have only went through half of it thus far. The SB states to ?Clean the area and remove any paint, overspray or primer that could hide a crack.? The pic that Van uses in the SB shows the crack without them removing the primer. Also noticed quite a few taking pics stating no cracks found, which didn?t bother to remove paint/primer either.
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  #522  
Old 02-12-2014, 01:49 PM
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magiccarpet magiccarpet is offline
 
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Location: Switzerland, Europe
Posts: 199
Default Step 13 Question

I don't understand why enlarging the forward top most holes of the flanges of HS-405 from #40 to #27 in step nr. 13 of the SB.
Those holes aren't anymore for any good after the SB fix, are they? I can't see from the drawings.
I rather don't want to enlarge them, 'cause they are already a tiny bit out of MED tolerance.
The most obvious reason I can imagine of, is to eliminate the 3/32 dimple around that holes. But why bother?

any ideas on that?

I probably should add that I haven't riveted the skin on the HS yet. Lucky me .So maybe that is why I don't understand the reason for step 13 yet.
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  #523  
Old 02-12-2014, 03:16 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Default There is a specific reason.

Quote:
Originally Posted by magiccarpet View Post
I don't understand why enlarging the forward top most holes of the flanges of HS-405 from #40 to #27 in step nr. 13 of the SB.
Those holes aren't anymore for any good after the SB fix, are they? I can't see from the drawings.
I rather don't want to enlarge them, 'cause they are already a tiny bit out of MED tolerance.
The most obvious reason I can imagine of, is to eliminate the 3/32 dimple around that holes. But why bother?

any ideas on that?

I probably should add that I haven't riveted the skin on the HS yet. Lucky me .So maybe that is why I don't understand the reason for step 13 yet.
After the inboard spar flange gets trimmed, there is a gap between the rib and the skin at the location of this hole. If a rivet is installed as is, it can suck the skin inward and the rib outward. Undesirable for both.
Structurally there is very little benefit having them riveted together, so the hole gets enlarged to allow filling the skin hole with a rivet, but not attach it to the rib.
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  #524  
Old 02-12-2014, 06:05 PM
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Geico266 Geico266 is offline
 
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Location: Huskerland, USA
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255 Hours
No cracks
No notches

Mild acro
Grass 40%

IO-360 195 HP
Constant speed
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  #525  
Old 02-12-2014, 10:32 PM
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magiccarpet magiccarpet is offline
 
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Quote:
Originally Posted by rvbuilder2002 View Post
After the inboard spar flange gets trimmed, there is a gap between the rib and the skin at the location of this hole. If a rivet is installed as is, it can suck the skin inward and the rib outward. Undesirable for both.
Structurally there is very little benefit having them riveted together, so the hole gets enlarged to allow filling the skin hole with a rivet, but not attach it to the rib.
That makes perfect sense. Thanks a lot for your explanation
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  #526  
Old 02-13-2014, 06:09 AM
ao.frog ao.frog is offline
 
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RV-7 290 hrs
Notches per plans
No cracks

75 % pavement
20 % grass
5 % snow-covered ice rwy's

Lots of std acro maneuvers (max +4)
Lots of formation

10 % at MTOW

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  #527  
Old 02-13-2014, 07:54 AM
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B Cunningham B Cunningham is offline
 
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RV7 225 hours
No cracks
Builder # 71313
Notches per the plans dimensions
Mild acro
-5% grass
Always pushed around with the empennage. I'm changing that habit...
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  #528  
Old 02-13-2014, 09:26 AM
tracy tracy is offline
 
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Location: chattanooga,tn
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Quote:
Originally Posted by rvbuilder2002 View Post
After the inboard spar flange gets trimmed, there is a gap between the rib and the skin at the location of this hole. If a rivet is installed as is, it can suck the skin inward and the rib outward. Undesirable for both.
Structurally there is very little benefit having them riveted together, so the hole gets enlarged to allow filling the skin hole with a rivet, but not attach it to the rib.
Could you just use the cut out flange piece and use it for a spacer with a rivet?
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  #529  
Old 02-13-2014, 10:12 AM
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Mark Burns Mark Burns is offline
 
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Location: Ruston, Louisiana
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Quote:
Originally Posted by tracy View Post
Could you just use the cut out flange piece and use it for a spacer with a rivet?
You obviously haven't cut your flanges off yet :-)
They are not pretty. I needed a right angle dremmel.

And you're not really complying with the SB if you add your own twist.
Minor as it may be, it wouldn't fly in the certified world. No pun intended.

Mark
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  #530  
Old 02-13-2014, 05:17 PM
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bret bret is offline
 
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Called Vans this morning inquiring about the repair kit. Apparently they sold out of the first batch pretty quick. Next week they should have the next batch ready to ship out she said. Just curious how many folk are doing the mod?
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