SMA PLT UNKNOWINGLY PERFORMS AN OVERWT TKOF AT LAS CRUCES; NM. HE 'SUCKS' THE GEAR UP EARLY AND THE ACFT SETTLES BACK DOWN; AT FULL PWR; TO THE RWY. HE ADMITS TO NOT WEIGHING PAX OR BAGGAGE. PLT INJURY MEDICATION A POSSIBLE FACTOR.

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REFUELED IN LRU ON FLT FROM ADS TO PSP. ACCELERATED TO FULL PWR; 10 DEG FLAP; ROTATED AT 70 KTS APPROX 2200 FT DOWN RWY. GEAR PULLED APPROX 10-15 FT IN AIR. SANK INTO GND AT FULL PWR. IN EFFECT A GEAR UP LNDG. SLIGHT WIND GUSTS. AFTER INCIDENT ACFT CONTENTS WEIGHED AND ACTUAL WT WAS SUCH THAT ACFT WAS 150 LBS OVER GROSS. I HAD PREVIOUSLY REMOVED THE 2 REAR SEATS AND HAD ESTIMATED MY WTS. CLRLY I SHOULD HAVE WEIGHED EACH OF MY PAX AND EACH OF THE BAGS. I SHOULD NOT HAVE PULLED THE GEAR UP AS EARLY AND NOT ASSUMED MY EMER GEAR SYS COULD PROTECT ME. THE WX WAS CLR; APPROX 70 DEGS WITH LIGHT GUSTS. I HAD BEEN INJURED IN A FALL THE EVENING BEFORE AND HAD TAKEN 2 TABLETS ON ARR IN LAS CRUCES. I HAD TAKEN 2 TABLETS EARLIER THAT MORNING IN DALLAS. I THINK THE CAUSE WAS MY INATTENTION TO MANY SIGNALS AND FAILING TO COMPENSATE FOR THEM. 1) LULLED INTO SECURITY BY EXCELLENT WX IGNORING SLIGHT GUSTS. 2) FAILING TO CLB FULLY OUT OF GND EFFECT PRIOR TO PULLING GEAR UP. 3) FAILURE TO CUT PWR ONCE I BECAME AWARE THAT GND CONTACT WAS IMMINENT. 4) FAILING TO ACTUALLY WEIGH EACH PAX AND LUGGAGE PRIOR TO DEP EARLIER THAT DAY. 5) GUESSING ABOUT THE AMOUNT OF WT SAVINGS THAT REMOVING THE 2 REAR SEATS WOULD PRODUCE.