We are provided with a pattern for the gaff, but it is in two pieces which are linked together with a puzzle joint. I taped up the joint , to keep it stiff. Like this.
Next I clamped the pattern in place on the piece of Douglas Fir, as here.
It is a very simple spar, with one straight and one symmetrically curved edge.
I marked up the shape and cut it out with the jigsaw.
Here it is being planed to a fair curve on the bench.
That was fun!