Fabric help

Tailwheel Rick

Tailwheel Rick

Active member
Joined
Dec 28, 2019
Messages
35
Location
Ridgeway, VA
I’m working on a 79 7GCBC fuselage recover. Doing with poly fiber. Saw in a poly instruction manual that you should not use zinc chromate on tubes. Did a little sanding on some of mine and need to prime, paint, etc. is the no zinc chromate advice accurate. If it is, any recommendations on what to use?
 
Be careful what you breathe. In the olden days you could get dope proof paint. The. You just coated the tubes with primer, then enamel, and brushed on the dope proof. It was like house paint.

Maybe spraying epoxy isn't as dangerous as things with iso-cyanates in them.
 
Tailwheel Rick said:
I’m working on a 79 7GCBC fuselage recover. Doing with poly fiber. Saw in a poly instruction manual that you should not use zinc chromate on tubes. Did a little sanding on some of mine and need to prime, paint, etc. is the no zinc chromate advice accurate. If it is, any recommendations on what to use?
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Is there a help line where you can ask the manufacturer what they prefer if not zinc chromate? Is zinc chromate available still? The cans i had for primer were zinc phosphate, it probably doesn't make a difference as far as poly fiber is concerned but I'd ask the manufacturer what is best under the fabric adhesive.
 
The problem is the Poly Tak pulling the paint off, leaving bare metal to corrode. You need a coating that will resist that. I used zinc chromate coated with epoxy yellow in 1969, and so far no rust! My airplane was outside until 1981, and again between 2003 and 2010.
 
New subject/question as I continue my project. I'm going to replace all bolts for tailfeathers and wings when I reassemble. Of course, I can look them up one by one in manual and order from Spruce or other source, but was wondering if anyone knows of someone who makes a "hardware kit" for a Citabria 7GCBC. (1979)
 
Tailwheel Rick said:
New subject/question as I continue my project. I'm going to replace all bolts for tailfeathers and wings when I reassemble. Of course, I can look them up one by one in manual and order from Spruce or other source, but was wondering if anyone knows of someone who makes a "hardware kit" for a Citabria 7GCBC. (1979)
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Me also. I find stainless kits for the non structural hardware but haven't found the structural. Anybody got suggestions?
 
Easier and cheaper to measure. Order from Spruce and elect US Mail.

I have been doing J3 Cubs for 60 years. Bolt sizes are in the parts catalog, but it is still easier and quicker to measure.
 
Bob Turner said:
Easier and cheaper to measure. Order from Spruce and elect US Mail.

I have been doing J3 Cubs for 60 years. Bolt sizes are in the parts catalog, but it is still easier and quicker to measure.
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Problem is I've bought a crashed and disassembled craft I've got bags of bolts and not sure where they all belong!
 
No - measure where they go. There is no guarantee that the old bolts are the correct size. You need to figure out grip length on critical bolts, then convert to AN. I think Spruce has the cross-reference.

For instance, the grip length on the stab bolts is the OD of the stab tube. Then a washer is placed on the underside so the nut doesn’t bottom out. Do not over-tighten; you could crush the tubes.

Often, a thin washer is placed under the head, and a thick washer under the nut. Not sure what ACA protocol is here - bolts in shear don’t really require the head washer (except high strength NAS bolts.

Take all this with a grain of salt - I am not a bolt expert.
 
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