Very nice, guys.
I think this spearhead is Sudanese, too. The blade itself is more slender, with a very pronounced middlerib (hope this is the right word).
But its dimensions ! ! !
Total length of the spearhead : 57 cm (about 22,8 inches)
length of actual spearblade : 39 cm (about 15,6 inches)
In my humble opinion, a slender blade will have more penetration power than a broad blade. Perhaps these broader blades were also used for 'slashing'.