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  #1  
Old 12-29-2011, 10:09 PM
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audioflyer audioflyer is offline
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Default lift tab insert re-do

Theoretically, if someone were to install a lift tab nutplate in the canard incorrectly, couldn't you just cut out a rectangle of foam around the installed nutplate and replace it with a microed-in new rectangle, blend the new one into the surrounding foam, then re-install the nutplate properly in the new piece?

Not that I would ever do such a thing in the first place. Purely theoretical, of course...

And these are from my 5-year-old:

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Old 12-29-2011, 10:41 PM
longezdave longezdave is offline
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Default Re: lift tab insert re-do

I hope this theoretical question is about a mistake made before the shear web is layed up??? If so, I don't see a problem with what you propose.
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Old 12-29-2011, 10:44 PM
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Default Re: lift tab insert re-do

Yes, definitely before the shear web.
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Old 12-29-2011, 11:38 PM
ZG4Me ZG4Me is offline
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Default Re: lift tab insert re-do

I don't see any reason you couldn't. Got foam?

Tip (or I got real lucky): The lift tabs should be a degree or two off plumb in order to get a nice fit against F-22. I recall I used a small finish nail (approx .050") under one end of each lift tab jig board at the shear web / reinforcement / cure stage. (think I got a pix somewhere, stay tuned)

When I jigged my finished canard to F-22, I needed no shims on F-22, none.

Rick

PS: Fuzzy pix attached. All four uprights are exactly the same length. Nails are .110" though. Got lucky (?) setting the cores perpendicular.

PPS: Found a better pix, edited out old one. That's an air gap on the far side.
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Last edited by ZG4Me : 12-30-2011 at 12:02 AM. Reason: Pix and more drivel.
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Old 01-02-2012, 05:14 PM
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audioflyer audioflyer is offline
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Default Re: lift tab insert re-do

I assume you mean that the the down-hanging ends of the canard lift tabs (the canard "fangs," if you will ) should be angled a degree or two aft?

I stumbled across a few tips on how to get the foam cores set up that I had not seen before, which I'll post in a new thread.
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Old 01-02-2012, 08:31 PM
ZG4Me ZG4Me is offline
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Default Re: lift tab insert re-do

Quote:
Originally Posted by audioflyer View Post
I assume you mean that the the down-hanging ends of the canard lift tabs (the canard "fangs," if you will ) should be angled a degree or two aft?
Correct. After adding the 10(?) ply crush layups, lay the lift tab jig/alignment plate back on, release taped of course.

Add a weight on top, offset from center (teeter-totter effect), then add a shim between the outer end and the vertical support to approximate the lift tabs a degree or two off perpendicular of the chord line. (double check, I'm trying to use aero terms)

Assuming the elevation (height) of your shear web surface is the same as your lift tab alignment jig supports.

You'll fine tune the lift tab fit onto F-22 in an upcoming chapter. IOW, don't sweat it too much right now.

Rick
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