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If you want to put a 5" curve in a ten foot board, you don't want to do it that simply.
Traditionally you would steam the board, and you could use a 10-12' long piece of venitlation duct as an improvised steam chamber for this board. Once it is nice and soggy, you take it out, set it in a jig, and let it dry. it will take on the curved shape and hold it.
Or, you don't use a solid board. You use 1/4" or thinner plies, set them in a jig and glue them up and clamp them. When the glue dries (epoxy or a water-proof alternate) again you'll have a curved board.
But to just force a board into that kind of curve? That's brute force, and the board will forever after be fighting whatever you do, trying to get straight again.