5 would be a struggle, I'd guess the spokes would be at too much of an angle. 3 is always a good choice.
5 came from Sheldon's wheel building info
48-spoke wheels are usually built cross 5, 40 spokes, cross 4; 36 spokes, cross 3 or 4; 32 spokes, cross 3; 28 or 24 spokes, cross 2...
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5 came from Sheldon's wheel building info