I think Darryl is rigth overhere. The bulb needs to be underwater constantly. The rake in the hull shape is just a nice looking aspect and weight/volume reduction. On the flyer A-cat there is also the same shape and we found out that the shape of the nose feels like a brake when the nose goes to deep in the water.
Thanks,
Klokkie
A-cat Ned-7 / Blade F16 distributor