HI DALLAS YOUR RIGHT ABOUT THE FAN AND THE AIR STREAM, CAUSING A FAN TO SPIN FASTER THANS IT NORMALLY WOULD , AND THIS SHOULD NOT BE A PROBLEM, HOWEVER MANY YEARS AGO WE WERE DOING HI SPEED COOLING TESTS USING LARGE HI OUT PUT HARTZELL FANS , AND BY MOVING THE FANS AT DIANGLES TO THE FRONT OF THE CAR , AT A GIVEN SPEED USUALLY ABOUT 15 DEGRES FROM CENTER, MOSTLY FROM THE DRIVERS SIDE , WE COULD ACTUALLY CAUSE THE FAN TO ALLMOST STOP, WITH AN EQUIVELANT VEH SPEED OF ABOUT 45 MPH AND THIS WILL CAUSE A FAN CLUTCH TO GET HOT ESP ONE WITH THIS KIND OF MILEAGE, BUT A TRUE HEAD ON WIND WOULDN,T EFFECT IT AT ALL , CONDITIONS HAVE TO BE JUST RITE AND I WOULD BET THAT YOU COULD HOLD THE FAN BLADES STILL ON TRAVIS TRUCK WITH THE ENG RUNNING AT IDLE ESP WITH THIS MILEAGE , RARE YOU BET POSSIABLE YOU BET JERRY