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Hi Virg,
I am no expert, but the bow bulb on a ship has to do with the interface between water and air. The bulb lifts the water ahead of the ship, which then falls away from the above water bow. Apparently its takes less work to lift the water than to push it aside (air is more compressible than water, and one is pushing against air when lifting the bow water).
On a car, or submarine, or airplane there is no such interface involved, and hence no bulbs.
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