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balsa cut question

Ak Flyer

Fly the wings off
You can buy pre formed pieces for ailerons and things. Otherwise sanding is your best choice. I can never get a straight cut that long with the grain.
If it is a large piece, use a fine saw to cut groves about every 1/8 inch or so from the thick side to the point. Then use a flat blade screw driver to gently break the tabs between the cuts. Finally, use a sanding block to finish the surface. 180 grit or finer should do.

If it's a small piece, use a hard backed sanding block or file to cut the taper.

Go slow either way.