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rob(at)pei.com.au
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 Posted: Mon Jan 16, 2006 3:50 am Post subject: Cove Ribs |
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Al,
Welcome to the list.
If I may I'd like to add my 2 cents worth on the subject of when to install
the cove ribs.
I'm at the stage where I have a completed, but unskinned, airframe. I'm now
in the process of installing all the internal systems which is much easier
when you can reach in through the "skeleton" to get to things.
I too pondered over the cove rib issue but have decided, (maybe incorrectly,
time will tell) to leave them until after I've skinned the wings.
The top skins are, from memory, 2mm and 1.5mm ply, which is very stiff over
a short span. It is my intention to fit them with a considerable amount
protruding past the aft spar, then trim the skin to provide a nice straight
line and clear of the flaps / ailerons by the minimum amount, probably 5mm
or so. The skins will only be cantilevered around 60 - 70mm unsupported
during this process and given their thickness I can't imagine they will be
at all floppy.
It should then be a simple matter to shape the cove ribs to suit and glue
them in place under the top skin, then install the cove rib trailing edge
and skin to close things out.
We shouldn't lose sight of the fact that the wing skin is the important item
here, the cove ribs are just there to provide it with some support for the
very small amount of overhang it has past the rear spar. Given the inherent
stiffness of the ply it could be argued that the cove ribs are almost
unnecessary . . but I'm not brave enough to advocate leaving them off all
together!
Just for the record, those in cold climates may be alarmed by my comment
above regarding a 5mm clearance between the skin and the control surfaces,
but in this part of the world, and at the altitudes I'll be flying, icing is
not a concern.
Anyway, that's my plan - if it doesn't work I'll be sure to let you all
know!
Cheers,
Rob
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votorschair(at)earthlink.
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| Posted: Mon Jan 16, 2006 5:22 am Post subject: Cove Ribs |
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The consensus seems to be to wait until after the aft spar is in place before cluing on the cove ribs. That is more in line with my thinking as it will ensure more accurate placement of those ribs.
I like Rob Phillis’s idea of waiting until after the wing skins are glued on. That would allow waiting until the wing is out of the jig and mounted in the fuselage jig, making it much easier to work with the cove ribs without having to lay on my back.
Thanks to both Rob Phillis and Graeme Lean for their thoughts on this.
AL Aitken
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george(at)falco.co.nz
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| Posted: Mon Jan 16, 2006 10:18 am Post subject: Cove Ribs |
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One minor issue with shaping the cove ribs is the fact that the hinge bolts
protrude from the spar making it a little difficult to use a long rod shaped
sander in the lower half of the ribs. Didn't have any impact on me since I
went conventional Falco and didn't skin them.
If you didn't have lower wing skins on you could leave the bolts out while
sanding cove ribs.. The top wing skins are supposed to be last but I don't
see any real difference.
GR's 50c worth
www.falco.co.nz
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