ACFT EQUIP PROB. POSSIBLE PWR LOSS CARB ICING.

Narrative

THE FLT WAS TO BE A PRACTICE FLT TO ACQUAINT OURSELVES TO OUR NEW HAND-HELD GPS NAVIGATOR. THE ACFT INVOLVED WAS A 1969 CESSNA 150 FITTED WITH A CRUISE PROP. A COMPLETE PREFLT INSPECTION WAS PERFORMED ON THE ACFT. THE SUMPS AND STRAINER WERE DRAINED. A SAMPLE FROM EACH WAS COLLECTED AND FUEL COLOR AND LACK OF CONTAMINATION WAS VERIFIED. NO WATER WAS PRESENT IN ANY SAMPLES. WE TAXIED TO THE END OF THE RWY 5 SINCE THE WIND WAS OUT OF THE NE AT APPROX 5 KTS. A RUN-UP CHK WAS PERFORMED. MIXTURE WAS FULL RICH; THE MAGNETOS AND CARB HEAT TESTS APPEARED NORMAL. MAGNETOS WERE RESET TO BOTH FOR TKOF. THE TKOF ROLL PROGRESSED WELL; ALTHOUGH THE ACCELERATION FELT SLUGGISH. I WAS EXPECTING THIS SINCE I HAVE BEEN REGULARLY FLYING THE CESSNA 172 AND THEIR ACCELERATION IS MORE BRISK WHEN THERE ARE ONLY 2 ABOARD. ROTATION CAME AT 60 MPH AND INITIAL CLB ESTABLISHED AT APPROX 65 MPH. I REDUCED THE CLB ANGLE TO INCREASE AIRSPD TO APPROX 70 MPH WHEN I WAS APPROX 100 FT AGL. AT APPROX 150 FT AGL AND CLOSE TO THE RWY INTXN (32-14) THE ENG APPEARED TO LOSE PWR AND THE ACFT STOPPED CLBING. MY INITIAL THOUGHT WAS TO LAND ON RWY 32 SO I REDUCED PWR. CONSIDERING THE TAILWIND COMPONENT AND MY HT I FELT THAT I WOULD NOT BE ABLE TO LAND ON THE AVAILABLE RWY. I RE-APPLIED PWR IN THE HOPES THAT I COULD USE PARTIAL PWR TO SLOW OR ARREST THE DSCNT AND MAKE MY WAY BACK TO RWY 5. AT THIS POINT I DECLARED AN EMER AND WAS CLRED TO LAND ON ANY RWY. PARTIAL PWR WAS MAINTAINED THROUGH AN ABBREVIATED L DOWNWIND AND I WAS ABLE TO LAND ON RWY 5. ONCE ON THE GND; THE ENG APPEARED TO RUN NORMALLY. DURING THE FLT; MY PRIMARY FOCUS WAS ON AIRSPD AND ALT. I DID NOT CHK THE TACHOMETER TO VERIFY A PWR LOSS AND DID NOT THINK TO ENGAGE THE CARB HEAT. THE FBO THAT I RENTED FROM CHKED THE ACFT AND IT DID NOT APPEAR TO HAVE ANY PROBS WITH THE ENG. I SUSPECT THAT EITHER SOME WATER IN THE FUEL TANKS WAS DISLODGED DURING THE TKOF ROLL OR THAT CARB ICE FORMED. THE TEMP WAS APPROX 80 DEGS F AND HUMIDITY APPROX 90 PERCENT.