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  #1  
Old 10-23-2006, 10:01 AM
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Default surface cracking

Quote:
Originally Posted by Carolynne View Post
I have never seen the sort of cracking that you describe in my aircraft or others that i have had the chance to look at. but if this really worries you, you might try adding a little flox to the micro mix. This should effectively 'cross link' the filler and provide more stability. I used this on some areas which needed a bit of a build up such as fillets between fuz and wing, wing and winglet etc.

carolyn
When I walk down the flight line and look at the canards, I see cracking. In the middle of wings, along edges. Nothing structural, just cosmetic stuff, but there all the same.

as far as checking with nobodies on the 2 oz fine weave cloth as a liner for the tanks, guess Nat Puffer is one of em cause that is who i talked to on using it.

As far as sheer strength goes, well, none of the glass has much, that is the weak point, i have pulled off the peel ply and mistakenly had glass in my hand also and ZIP, off it came with the peel ply.

I like building, hate repairing. Don't particularly like the idea of the flox added to the micro in soo many places as it would make the plane a PIA to sand.

Maybe I'll do a test layup, yeah, a test layup, thats the ticket.

Youall can tell me that this or that plane has no cracks, but, that is not what my eyes tell me, see em all over, don't want em
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  #2  
Old 10-23-2006, 12:03 PM
Lynn Erickson Lynn Erickson is offline
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Default

Quote:
Originally Posted by Dust View Post
When I walk down the flight line and look at the canards, I see cracking. In the middle of wings, along edges. Nothing structural, just cosmetic stuff, but there all the same.

as far as checking with nobodies on the 2 oz fine weave cloth as a liner for the tanks, guess Nat Puffer is one of em cause that is who i talked to on using it.

As far as sheer strength goes, well, none of the glass has much, that is the weak point, i have pulled off the peel ply and mistakenly had glass in my hand also and ZIP, off it came with the peel ply.

I like building, hate repairing. Don't particularly like the idea of the flox added to the micro in soo many places as it would make the plane a PIA to sand.

Maybe I'll do a test layup, yeah, a test layup, thats the ticket.

Youall can tell me that this or that plane has no cracks, but, that is not what my eyes tell me, see em all over, don't want em
most of those cracks you are seeing are most likely in the paint. a lot of the canard aircraft are painted with auto paint and over time the flexing of the structure causes it to crack. we have checked many of these over the years and have never found it to be more then the paint. we see the same thing on the fiber glass car parts. also shows up on glass and carbon covered props if you add to much paint or primer.
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  #3  
Old 10-23-2006, 12:13 PM
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mmmmmmmmmmmm, its just the paint, mmmmmmmmmmmm

Well, I LIKE that answer cause it is easier, but i hate the answer cause of that, hard to trust the liking of an answer that you like. Not hard to trust you.

are the urethanes we been advised to use part of the automotive paint systems that you have seen cracking?

one plane of note is Richter's jet, not to bash him at all, just one that pops out in my memory of cracks, lots of em

Also my tech advisor has em (just a couple that bug him), I'll check on what paint system he used
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dust

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Old 10-23-2006, 12:51 PM
SteveWrightNZ SteveWrightNZ is offline
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as long as the layers or bog and paint are thin, you should be fine - not much cracking. This means, of course, that your workmanship has to be perfect - no covering a multitude of sins with micro and twelve coats of paint. As is the usual, it takes about the same to make a thing, whether you do a tidy job underneath and little to fill, or a careless job underneath and much filling and sanding, but one will get you cracking and one will not.

S
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Old 10-23-2006, 01:08 PM
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little fill sounds great, but the reality of my plane is not.

for example, you make beautiful wing and then attach it with 18 layers of cloth each stepped in an inch. the list goes on and on and on.

plenty of micro is goin on, that is just the way that it is.

I am confident in my ability to fill and sand so that nothing to speak of will be primer filled and the paint will be thick enough. those skills i already have in making a gloss finish on woodworking projects.

fill the grain, wet sand, 3 coats of sanding sealer, wet sand, 3 coats of gloss, wet sand, 3 more light coats of gloss or mat, wet sand and polish

All blems must be removed before i leave 36 grit and micro.
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Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou
dust

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Old 10-24-2006, 02:46 PM
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Just got off the phone with my tech advisor

1 cracks are below paint level
2 he has used the cloth i am using and in the areas he used it - no cracking

Not an answer i liked hearing
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Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou
dust

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