jeffcoaj

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About jeffcoaj

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  1. jeffcoaj added a post in a topic Another Wing Spar Question   

    thanks for your expertise, and your comments reinforce what I was thinking. I was wondering if there were any example pictures of “no go”, or just some examples (descriptions) from past experience.
    thanks again.
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  2. jeffcoaj added a post in a topic Another Wing Spar Question   

    Thanks, yes I did not realize that the new spars did not have an I-beam all the way through. I can see where the flex would be more, and the new spars do not have the extra support of a full length I-beam. True?  If so, my spar is way over engineered comparatively, it seems, and stiffer.
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  3. jeffcoaj added a post in a topic Another Wing Spar Question   

    In the words of capt. ron, if its going to happen, its going to happen up there.
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  4. jeffcoaj added a post in a topic Another Wing Spar Question   

    If it fails at less than rated G, then I'm glad I didn't fly it. I am sure failure should occur at twice the rating or some fudge factor. I would test at less than rated.
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  5. jeffcoaj added a post in a topic Another Wing Spar Question   

    It should not fail up to it's g rating.
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  6. jeffcoaj added a post in a topic Another Wing Spar Question   

    I can only agree. Now I know, there are 2 distinct sides.
    I.e., I could argue microballoons mixed with epoxy will weaken a bond (its mostly air and makes epoxy sand easier). Cabosil on the other hand makes bonds stronger and rock hard ( impossible to sand almost). I would never use microballoons in a bond as I've read in some places, and I base this on experience. Also, this is easy to test. And experience is king.
    Is there a way to test the wing (on the ground)? I've seen some wing tests with sandbags for strength. 
     
     
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  7. jeffcoaj added a post in a topic Another Wing Spar Question   

    Thanks guys. Back to square one, I've got enough doubts. I do not have an avid manual, and I did not see it mentioned in the KF manual (maybe its in there). 43.13 does have it so no excuse. I would definitely not sell it without full disclosure.
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  8. jeffcoaj added a post in a topic Another Wing Spar Question   

    Thanks guys! I am moving forward. I went from no wings this morning to now I cant wait to mount the engine, Rotax Rick 582.
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  9. jeffcoaj added a post in a topic Another Wing Spar Question   

    Thanks for the replies!
    I did debur the holes prior to riveting... but I won't be able to sand down- I didn't make clear that the wings are installed (glued and riveted). This is where I am - all measurements are perfect on both sides in washout in 12" increments all the way down the wing as well as squareness, length and dihedral.
    In doing some reading about these spars, it seemed even the slightest scratch would lend the spar to be useless.
    Now, I think I may not scrap it but keep going? In this light, sound reasonable?
    Thanks again! 

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  10. jeffcoaj added a topic in Avidfoxflyers General Hangar   

    Another Wing Spar Question
    This is my first post. I am at the beginning of a build and just mounted the wings on the fuse. I've got kitfox wings with the old spar where you don't have to insert the I-Beam. I understand that scuffing the spar with 220 grit is acceptable according to the manual. However, underneath the strut brace, the spar was prepped with something closer to 80 grit. Since the strut brace is riveted and hysoled to the spar, this is like a "doubler" or reinforcement. Of course, I am not sure.
    I believe I have to start over which sucks greatly, but was wanting some concurrence.
    Pictures show the scratches-(no other parts of the spar are scratched as such).
    Thanks and look forward to your responses and expertise-
    Joey



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