The system includes radiation generation and transmission components which radiate tuned microwave electromagnetic energy outwardly from a vehicle through an antenna into a fluid medium through which the vehicle is moving. The microwave radiation is at the frequency of harmonic resonance electromagnetic...http://www.google.se/patents/US5797563?utm_source=gb-gplus-sharePatent US5797563 - System for increasing the aerodynamic and hydrodynamic efficiency of a vehicle in motion 
