A sharper bow is theoretically faster than rounded one when going straight, but in reality the boat is almost never going straight through the water so a radius actually offers some efficiency advantages.

But the main reason for having a decent radius is strength and ease of glassing.

> How sharp shall I make the bow. My glassfiberkayak is almost 20 mm in the
> bow but that seems to be to much for a stripbuilt kayak. I am using 4.5 mm
> strips and that gives the bow a width of about 5 mm. Is it to sharp? I
> suppose it´s a question of speed visavi strength. Fritjof