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Old 07-25-2007, 09:18 PM
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MHester
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Default RE: Black Magic VF3 E build thread!

Prepping the cores

Foam is a funny thing. it has internal stresses and 'wet" spots that make life difficult. All you need to know is that the cores were cut weighted on a flat table bottom side down, so always do sanding, weighting etc with this in mind.

When foam is cut, a hairy melted foam crap is left on the surface and the surface is glazed. This needs to be sanded off, but not yet.

First prep the Wing, stab and rudder cores by marking and cutting away the TE 1/4" back and sanding it flush (CAREFULLY) with a sanding bar.

Now install the false ribs and run the wing/stab tube inside and check to be sure the hole is centered and clears the tube. Sometimes the hole for the socket is a bit tight, so wrap some sandpaper around the tube (not the socket) and twist this inside the hole until the hole clears the socket. it should slide freely, but not really sloppy.

Now locate the balsa insert point for the hard points. Cut them out and install pieces of balsa to fit.

Now glue on 1/4" contest balsa strips for the TEs, glue in the false ribs, and glue in the balsa inserts with polyurethane glue. This stuff needs to be FRESH and thin. Wipe off the excess with a paper towel. It should only appear damp. tape the TE in place with masking tape and let dry overnight (or while you're making the skins.)
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