Superconductive materials don't need to have magnetic fields present for them to levitate. You can create levitation with electric fields.
Airbrakes are only useful in highway speeds or higher. At low speed they do nothing. The best type of airbrakes for cars are roof deploying spoilers or a boot deploying air brake, like the ones on those Porsches. But roof ones work better for average highway speeds because they catch most of the airflow. I suggest you use a worm gear connected to a servo motor and a regular gear connected to the airbrake's pivot point. It will massivelly reduce the stress on the servo motor, plus helps holding the spoiler in position. The only bad side is that it isn't too quick to deploy.Originally Posted by Amaroq Dricaldari
Something like this:
http://www.geardesign.co.uk/images/gears/worm-gears.jpg
http://en.wikipedia.org/wiki/Worm_drive
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