Yes, your average out-board boat has a truncated tail, but at speed, think about how much of the hull is actually submerged. A great part of the boat comes out of the water and "skis" along the surface. What water would otherwise create vorteces around the tail is already turbulated by the propeller and its effects significantly negated.
*edit* missed this post \/
Quote:
Originally Posted by SuperTrooper
I've been looking into electric boats and I've learned a lot about hull shape and speed/drag. Boats like canoes and sailboats are "displacement" hulls - they literally push the water around the hull to move the boat forward. A smooth transition at the rear becomes more important for drag reduction. Most recreational power boats are "planing" hulls with the boat riding on top of the water. The less hull in the water the less the drag.
Cars are definitely displacement hulls.   |