I don't always sand the balsa sheet flat. I depends how rough the sheet is. Sometimes if the sheet is smooth I go right to freeing up the parts. This one was rough.
I said there was a lot of pieces.
ALL the leading edges will be rounded.
The curved inside edges of the forward wing pieces were sanded square with some 400 grit wrapped around a 24mm engine casing. This keeps a squared edge on the inside curve without breaking off the tip just to the right of the casing.
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