It seems to me that a fish is also somewhat dubious an example too as it essentially uses its body to propel itself through the water. This would require a design that best interacts with with the water to generate thrust rather than just reduce drag (which I guess explains the flatness of form of fast fish.)
Also, as with belly tank's, a typical fish's form isn't designed to operate at close to ground level where ground effects can have a strong effect.
This is where camber needs to be introduced to the torpedo form to balance up the accelerated air under the car (due to squeezing) by making the travel distance over the car longer.
Hawkwind's model has this camber naturally built into it. I wonder if the fish you were looking at Gary was a bottom dweller?
Our belly tank has a camber of 6% which is apparently about right for its proximity to the ground. (Camber is essentially worked out as a percentage the centre line of the body mass is off the line from tip to tail.)
Reverend H+
