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  #1  
Old 11-21-2015, 05:25 PM
sblack sblack is offline
 
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Default Uh oh

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  #2  
Old 11-21-2015, 05:27 PM
sblack sblack is offline
 
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Any advice? This is a project that I bought. I get this gap with the rear spar bolted in place.
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  #3  
Old 11-21-2015, 05:43 PM
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Do you have a straight edge clamped to the rear spar? The rear spar can flex enough to cause this.

Otherwise it's not uncommon to have to shim the forward spar attach brkt.
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Last edited by Mel : 11-21-2015 at 06:06 PM.
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  #4  
Old 11-21-2015, 05:58 PM
sblack sblack is offline
 
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It's pretty much impossible to clamp a straight edge there with the hinges and doublers etc. anyway flexing the spar changes the relative angles but not the gap. Does anyone see a big problem just making a filler block? The gap is 0.28", which is a lot.

I am not optimistic about the intersection fairing fitting very well, but then they never do.
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  #5  
Old 11-21-2015, 06:17 PM
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A 0.25" spacer will solve this common problem.
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  #6  
Old 11-21-2015, 07:48 PM
BillL BillL is offline
 
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Quote:
Originally Posted by sblack View Post
It's pretty much impossible to clamp a straight edge there with the hinges and doublers etc. anyway flexing the spar changes the relative angles but not the gap. Does anyone see a big problem just making a filler block? The gap is 0.28", which is a lot.

I am not optimistic about the intersection fairing fitting very well, but then they never do.
If you extend the plane of the VS spar downward, can you remake the connecting piece with the bend in a different location to eliminate the severe offset and yield a line of force that does not create a bending couple about the spacer? If the plane is forward, then you still might have a spacer, but it would be much smaller.
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  #7  
Old 11-21-2015, 07:49 PM
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Quote:
Originally Posted by sblack View Post
It's pretty much impossible to clamp a straight edge there with the hinges and doublers etc. anyway flexing the spar changes the relative angles but not the gap. Does anyone see a big problem just making a filler block? The gap is 0.28", which is a lot.

I am not optimistic about the intersection fairing fitting very well, but then they never do.
Even if you can't clamp a straight edge there, you need to shine a laser, or use a tight string, down through all three of the hinge bracket holes before you fabricate any spacers. Also make sure the fin spar is tightly bolted to the aft bulkhead.
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  #8  
Old 11-21-2015, 08:29 PM
sblack sblack is offline
 
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Quote:
Originally Posted by BillL View Post
If you extend the plane of the VS spar downward, can you remake the connecting piece with the bend in a different location to eliminate the severe offset and yield a line of force that does not create a bending couple about the spacer? If the plane is forward, then you still might have a spacer, but it would be much smaller.
No I looked at that. The bend line would have to be below the top of the hstab spar. It is really off.
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  #9  
Old 11-21-2015, 08:29 PM
sblack sblack is offline
 
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Quote:
Originally Posted by az_gila View Post
Even if you can't clamp a straight edge there, you need to shine a laser, or use a tight string, down through all three of the hinge bracket holes before you fabricate any spacers. Also make sure the fin spar is tightly bolted to the aft bulkhead.
Good idea for the string will do.
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  #10  
Old 11-21-2015, 09:27 PM
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Ironflight Ironflight is offline
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We had a similar (slightly smaller) gap on our RV-3, and built a spacer with the concurrance of engineering support - worked out just fine. We drilled lightening holes in the spacer to keep it from being a huge blivet.
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Last edited by Ironflight : 11-21-2015 at 09:30 PM.
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