THE PILOT OBSERVED THAT THE AIRCRAFT WAS NOT PRODUCING EXPECTED POWER, AND ASSURED DURING THE TAKEOFF GROUND RUN THAT THE PROPELLER, THROTTLE, AND MIXTURE CONTROLS WERE FULL FORWARD. THE TAKEOFF USED ABOUT HALF THE LENGTH OF THE 8202 FOOT RUNWAY. THE AIRCRAFT LIFTED OFF, CLIMBED TO ABOUT 50 FEET AND WOULD NOT CLIMB. THE AIRCRAFT STRUCK A LIGHT POLE AND CRASHED IN A FIELD ABOUT 1.5 MILES FROM THE AIRPORT. ALTHOUGH THE PILOT NOTED THAT HE HAD EXPECTED TO TAKEOFF GROUND RUN TO BE ABOUT 2000 FEET, HE FAILED TO ABORT THE TAKEOFF.