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  #1  
Old 05-05-2021, 06:02 PM
msstahl's Avatar
msstahl msstahl is offline
 
Join Date: Mar 2020
Location: Murray, Nebraska
Posts: 17
Default Fuel Tank Assembly

I'm starting work on the fuel tank assembly and the first steps are working with the Z brackets. The plans seem to be lagging the parts as all the holes are pre-punched/drilled which leads me to my question.

Is it necessary to bolt the z brackets to the spar, cleco the rear baffle to the Z brackets and attach the tank skin to check for alignment? With the accuracy of the pre-punched components this really doesn't seem necessary so I'm hoping others can validate my thoughts or provide the reason for the work.

I'm curious what others have done here before I start.
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  #2  
Old 05-05-2021, 06:05 PM
Taltruda Taltruda is online now
 
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I think there are threads and google info called the ďDan Checkoway methodĒ even though he gives the credit to someone else.. I plan to follow what they did. Using the rear baffle as a guide to lining everything up.
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  #3  
Old 05-05-2021, 07:36 PM
PhatRV PhatRV is online now
 
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Location: Buena Park, California
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I created 4 templates that match the four corners of the wing tank skin and cleco the templates with the fuel-tank baffle to the spar flange. The template holes are matched drilled to the tank skin so the holes that line up with the skin and the baffles are all matched. This will keep the baffle in alignment as you drill the pass the baffle into the z-brackets.

But the pictures below should show how the templates are used.
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  #4  
Old 05-05-2021, 07:54 PM
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wirejock wirejock is offline
 
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Quote:
Originally Posted by Taltruda View Post
I think there are threads and google info called the ďDan Checkoway methodĒ even though he gives the credit to someone else.. I plan to follow what they did. Using the rear baffle as a guide to lining everything up.
What he ^ said. It works.
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I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #5  
Old 05-05-2021, 10:04 PM
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Jonnyb Jonnyb is offline
 
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Location: UK
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Default

The pre drilled Z brackets are very new, so youíre probably one of the first to get to this point.

I have the same pre drilled brackets, my plan is to check for alinement as per the plans. Itís probably not necessary as you say, but itís a mornings work, and I would rather find out it wasnít necessary than discover it was further down the line.

Did you get the email from Jessica with the new plans?
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  #6  
Old 05-06-2021, 07:13 AM
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Vfr1200 Vfr1200 is offline
 
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Location: Celina ohio
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Default Tanks

I fallowed the directions and watched the Vans video on the tanks , so many opportunities to make a mistake on the tanks , itís a critical step with the rear baffle alignment, if I did it again I would not use the vans method but fallow the many tips they provide . My tanks fit perfect but I had a few leaks to contend with that was puzzling with the amount of proseal I used . Good luck
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  #7  
Old 05-06-2021, 07:57 AM
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msstahl msstahl is offline
 
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Ok - sounds like there has been an update made to recent kits as Jonnyb has eluded to. The main difference being that the Z brackets are already final drilled for the bulkhead attach rivets, the plate nut holes are slightly undersized and the bolt holes final sizes. I will have to run a reamer through the wing spar to open the bolt holes up slightly. But all in all so far everything is lining up nicely.

@ Jonnyb - I have not received an E-mail with updated plans from Vans so Iíll make a phone call today!
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  #8  
Old 05-06-2021, 08:08 AM
Girraf Girraf is offline
 
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Dare I say that pre-drilled Z brackets might have been a step backward for the kit. With the undrilled versions, the builder had the option to bias the bracket slightly (vice putting the holes on the flange centerlines) such that the rivet holes would be slightly closer the Z bracket web, and the bolt holes for the spar would be slightly further from the web. All still had appropriate edge distance but it provided plenty of clearance to put a socket on the head of the AN-3 bolts that holes the Z brackets to the spar.
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  #9  
Old 05-06-2021, 08:33 AM
Taltruda Taltruda is online now
 
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Quote:
Originally Posted by Girraf View Post
Dare I say that pre-drilled Z brackets might have been a step backward for the kit. With the undrilled versions, the builder had the option to bias the bracket slightly (vice putting the holes on the flange centerlines) such that the rivet holes would be slightly closer the Z bracket web, and the bolt holes for the spar would be slightly further from the web. All still had appropriate edge distance but it provided plenty of clearance to put a socket on the head of the AN-3 bolts that holes the Z brackets to the spar.
Correct me if Iím wrong, but donít the bolt heads go on the rear face spar side, into the z brackets? So there isnít any clearance problems with the socket because the bolts come from the spar side into the z, into nutplates? Whatís the purpose of offsetting the brackets?
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  #10  
Old 05-06-2021, 08:41 AM
Girraf Girraf is offline
 
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Quote:
Originally Posted by Taltruda View Post
Correct me if Iím wrong, but donít the bolt heads go on the rear face spar side, into the z brackets? So there isnít any clearance problems with the socket because the bolts come from the spar side into the z, into nutplates? Whatís the purpose of offsetting the brackets?
That's true. This is probably only significant then on the inboard most z bracket where the bolt head is adjacent to the Z bracket web.
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