From my understanding, unibody cars are 1 piece body & frame. I don’t understand how some cars with a very different design are built on the same platform (EG Honda Civic and Crv). These are clearly not just the same unibody with just different body panels.
In: Engineering
The “platform” is essentially the floorplan and all the mechanical components of the car (the engine, suspension etc)–what would have been the chassis in old-style cars. Such a structure isn’t rigid enough by itself to be a workable car, but once you build a body on top then it becomes one.
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