Here is a good lesson in aerodynamic drag. pretty self explanitory really 
and another that shows how its not the front trying to push through the air thats important but keeping a boundary layer of air in contact to reduce the turbulent wake behind, that causes a vacuum that try,s to pull you back
"you were only supposed to blow the bloody SLIDING doors off"
and another that shows how its not the front trying to push through the air thats important but keeping a boundary layer of air in contact to reduce the turbulent wake behind, that causes a vacuum that try,s to pull you back
"you were only supposed to blow the bloody SLIDING doors off"